# HG changeset patch
# User Markus Bröker <mbroeker@largo.homelinux.org>
# Date 1229172043 -3600
# Node ID e0dbaef723620b90f9bfba8e0cd966cdcb3cdf76

svn copy of the chess engine

diff --git a/.classpath b/.classpath
new file mode 100644
--- /dev/null
+++ b/.classpath
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path=""/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="lib" path="/usr/local/lib/classes/junit.jar"/>
+	<classpathentry kind="output" path=""/>
+</classpath>
diff --git a/.project b/.project
new file mode 100644
--- /dev/null
+++ b/.project
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Schachspiel</name>
+	<comment></comment>
+	<projects></projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments></arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/bin/.keep b/bin/.keep
new file mode 100644
diff --git a/build.xml b/build.xml
new file mode 100644
--- /dev/null
+++ b/build.xml
@@ -0,0 +1,91 @@
+<?xml version="1.0"?>
+<project name="Schach" basedir="." default="jar">
+	<property name="project" value="Schach" />
+	<property name="package.name" value="org.homelinux.largo" />
+	<property name="package.dir" value="org/homelinux/largo" />
+	<property name="jar.file" value="bin/games.jar" />
+	<property name="classpath.dir" value="/usr/local/lib/classes" />
+	<property name="www.dir" value="/var/www/localhost/htdocs/classes" />
+	<property name="docs.dir" value="docs/" />
+	<property name="debug" value="simu" />
+
+	<property name="distributable.exts"
+		value="**/*.class,**/*.gif,**/*.html,**/*.jar,**/*.jnlp,**/*.jpg,**/*.png" />
+	<path id="Schach.classpath">
+		<pathelement location="." />
+	</path>
+
+	<!-- Targets -->
+	<target name="clean">
+		<echo
+			message="deleting all class- and jar-files  in ${package.dir} tree" />
+		<delete>
+			<fileset dir="${package.dir}" includes="**/*.class" />			
+		</delete>
+
+		<delete file="${jar.file}" />
+	</target>
+
+	<target name="docs"
+	    depends="compile,docs-init"
+    	description="Generate JavaDocs.">
+
+    <javadoc destdir="${docs.dir}"
+        author="true"
+        version="true"
+        use="true"
+        windowtitle="${ant.project.name}"
+        sourcepathref="Schach.classpath"
+        packagenames="org.*"
+        verbose="false">
+        <doctitle><![CDATA[<h1>${ant.project.name}</h1>]]></doctitle>
+        <bottom>
+            <![CDATA[<i>Developed by Largo Enterprises in 2008</i>]]>
+        </bottom>
+    </javadoc>
+
+	</target>
+		<target name="docs-init">
+		    <mkdir dir="${docs.dir}"/>
+		</target>
+
+	<target name="docs-clean">
+    	<delete dir="${docs.dir}"/>
+	</target>
+
+	<target name="compile">
+		<echo message="compiling ${package.dir} tree." />
+		<javac source="1.5" target="1.5" srcdir="${package.dir}"
+			sourcepath="${basedir}" debug="on">
+			<classpath refid="Schach.classpath" />
+		</javac>
+	</target>
+
+	<target name="jar" depends="compile">
+		<property environment="env" />
+		<jar destfile="${jar.file}" basedir="${basedir}"
+			includes="org/ images/" 
+			manifest="schach.manifest" />
+	</target>
+
+	<target name="post" depends="jar">
+		<signjar jar="${jar.file}" alias="largo" storepass="${env.jsp}" />
+		<copy file="${jar.file}" todir="${www.dir}"/>
+	</target>
+
+	<target name="debug" depends="compile">
+		<java classname="org.homelinux.largo.schach.Schach"
+			failonerror="true" fork="yes">
+			<classpath refid="Schach.classpath" />
+			<arg line="${debug}" />
+		</java>
+	</target>
+
+	<target name="checkers" depends="compile">
+		<java classname="org.homelinux.largo.checkers.Checkers"
+			failonerror="true" fork="yes">
+			<classpath refid="Schach.classpath" />
+			<arg line="${debug}" />
+		</java>
+	</target>
+</project>
diff --git a/images/black_bishop.png b/images/black_bishop.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..7408ed6dec65f655f57b0b15654266f990e50e5b
GIT binary patch
literal 854
zc$@)N1F8IpP)<h;3K|Lk000e1NJLTq002Ay002A)1^@s6I{evk0009WNkl<ZXo2lo
zJ#w=!5Pf1Y<Bn8xq)Sp*P14yNm*76iA#w?G38l&jP?ZiUsS2GN?^om#gPqtWHd^AJ
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g8dt*Sj*BDw4-ny|K5{PtM*si-07*qoM6N<$g26JAUjP6A

diff --git a/images/black_king.png b/images/black_king.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..d700e261eae48c7dbcc04580f0c78f9630072696
GIT binary patch
literal 1732
zc$@*m20QtQP)<h;3K|Lk000e1NJLTq002Ay002A)1^@s6I{evk000JyNkl<ZXo2Nh
zJ#U;y7=Aci8Eram13w@;+R6<`Cxu8+(xmjz<OihQq;a=ww^dx{2c&`h1<^_wS2)t@
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a2>%P3)ub++i<9O60000<MNUMnLSTZ6n^f-r

diff --git a/images/black_knight.png b/images/black_knight.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0747ecb76c248149d1e80f617f5cb7d52e591be3
GIT binary patch
literal 833
zc$@)21HSx;P)<h;3K|Lk000e1NJLTq002Ay002A)1^@s6I{evk0009BNkl<ZXo2lo
zJ#z9e5PkN1Gjvd?bDK&hNVk{JeRK&<;X_1Sx^$Zh#1*cfbCXT+jTswc{DWjL@Mct?
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diff --git a/images/black_pawn.png b/images/black_pawn.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..1483c3b75fd31976cf039703942b276006a9f33c
GIT binary patch
literal 769
zc$@(N1OEJpP)<h;3K|Lk000e1NJLTq002Ay002A)1^@s6I{evk0008WNkl<ZXo2lo
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diff --git a/images/black_queen.png b/images/black_queen.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..06bd29635cae439204b9b5c9efab5784ba71944f
GIT binary patch
literal 1352
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KMNUMnLSTZ?&6M8&

diff --git a/images/black_rook.png b/images/black_rook.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..99f30123f60e288be11bd460506de6b630e3472d
GIT binary patch
literal 815
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diff --git a/images/black_sun.png b/images/black_sun.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..39fd98c1ae1ff71bd74b54fef966598b5c06689e
GIT binary patch
literal 407
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diff --git a/images/black_super_sun.png b/images/black_super_sun.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..391439b869101db761ab561d811fd2425b06aef5
GIT binary patch
literal 623
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diff --git a/images/white_bishop.png b/images/white_bishop.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0675e4aa6dd08503483cfb3cdb13f33300c862b9
GIT binary patch
literal 1165
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diff --git a/images/white_king.png b/images/white_king.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..afbac3570d28203d3d645ecb14e9af6e72a9b920
GIT binary patch
literal 2301
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diff --git a/images/white_knight.png b/images/white_knight.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..eece7b61345e053c4b9e09cbef551a49330a5e19
GIT binary patch
literal 1284
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diff --git a/images/white_pawn.png b/images/white_pawn.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..c81d538dcf0cf33ac92d332ca367e49b9715fec1
GIT binary patch
literal 973
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vwuKF@<&T)K@X=LEPQT*$2^^h;k52G!li~@oKpZp200000NkvXXu0mjfRu|Lq

diff --git a/images/white_queen.png b/images/white_queen.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..d454391231c5544edce9f0c91659a85c8445b82e
GIT binary patch
literal 1551
zc$@(b2JrcbP)<h;3K|Lk000e1NJLTq002Ay002A)1^@s6I{evk000HnNkl<ZXo2Nh
zJ8s)b6g@N^AgG}#vZ5*}K*H(LSgbPHgD3k)n`*oQ??cQ2QjROVEMS-vDGZ2}ScxtS
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zhWPU3OYORS74CJ5M+i~N(x!4vq;+$1ld-jw5?{Z5t=zkqH;+bIX2agL?GmdVE7-T2
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B{O14w

diff --git a/images/white_rook.png b/images/white_rook.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..07adda81e9570d4ad002e17f992de904594dd04c
GIT binary patch
literal 1773
zc$@+41`_#+P)<h;3K|Lk000e1NJLTq002Ay002A)1^@s6I{evk000KGNkl<ZXo2mS
z%}*0u6o;P{O_7fhL=mwlA8Mo#BLXooVablfMHBx3S8Uw6G{l%_bfXK23wK6W65>XP
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zG-O~Kf*TtfdGh25PoF+zaBz^};bDXj7z_rHY6NO)Yq@db2L1j0OiWCq6ufq1>+9=j
zX=$OauaB=^zwVx3zu%9;;lN_Ckdu=`JRYa7uaBXjp_Ef`BU1V1<>hhz{(Tfh!QpVQ
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diff --git a/images/white_sun.png b/images/white_sun.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..e9e165957707804c6f4e40cf70a17c182c5deb0a
GIT binary patch
literal 411
zc$@*70c8G(P)<h;3K|Lk000e1NJLTq002Ay002A)1^@s6I{evk00009a7bBm000XU
z000XU0RWnu7ytkO8FWQhbVF}#ZDnqB07G(RVRU6=Aa`kWXdp*PO;A^X4i^9b0VqjC
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zN5e$qzg_0S0}V$9!eQ1gQ~03a=s-9+5RMLnqXXgD_p{3>e9&-oAWTGY*71c08b0ve
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FV1lUvu1x>{

diff --git a/images/white_super_sun.png b/images/white_super_sun.png
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..957f65daf70373f8dfe1c90bb9b38e5b46b8d51e
GIT binary patch
literal 586
zc$@)B0=4~#P)<h;3K|Lk000e1NJLTq002Ay002A)1^@s6I{evk00009a7bBm000XU
z000XU0RWnu7ytkO8FWQhbVF}#ZDnqB07G(RVRU6=Aa`kWXdp*PO;A^X4i^9b0oO@H
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z_7Uh02AmD{5#SdeI4kTUrhmt^mb@%&6x~@$HJd(*%)JKI);+;JYWNAX+u}jf4n6mJ
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diff --git a/jnlp/checkers.jnlp b/jnlp/checkers.jnlp
new file mode 100644
--- /dev/null
+++ b/jnlp/checkers.jnlp
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE jnlp PUBLIC "-//Sun Microsystems, Inc//DTD JNLP Discriptor 6.0//EN" "http://java.sun.com/dtd/JNLP-6.0.dtd">
+<jnlp spec="1.0+" codebase="http://largo.homelinux.org/classes" href="checkers.jnlp">
+	<information>
+		<title>Checkers</title>
+		<vendor>Largo Enterprises</vendor>
+		<homepage href="http://largo.homelinux.org"></homepage>
+		<description>Checkers</description>
+		<offline-allowed/>
+	</information>
+	<security>
+		<all-permissions/>
+	</security>
+	<resources>
+		<j2se version="1.5+"/>
+		<jar href="games.jar" main="true"/>
+	</resources>
+    <application-desc main-class="org.homelinux.largo.checkers.Checkers">
+                <argument>none</argument>
+	</application-desc>
+</jnlp>
diff --git a/jnlp/schach.jnlp b/jnlp/schach.jnlp
new file mode 100644
--- /dev/null
+++ b/jnlp/schach.jnlp
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE jnlp PUBLIC "-//Sun Microsystems, Inc//DTD JNLP Discriptor 6.0//EN" "http://java.sun.com/dtd/JNLP-6.0.dtd">
+<jnlp spec="1.0+" codebase="http://largo.homelinux.org/classes" href="schach.jnlp">
+	<information>
+		<title>Chess</title>
+		<vendor>Largo Enterprises</vendor>
+		<homepage href="http://largo.homelinux.org"></homepage>
+		<description>Chess</description>
+		<offline-allowed/>
+	</information>
+	<security>
+		<all-permissions/>
+	</security>
+	<resources>
+		<j2se version="1.5+"/>
+		<jar href="games.jar" main="true"/>
+	</resources>
+    <application-desc>
+                <argument>none</argument>
+	</application-desc>
+</jnlp>
diff --git a/org/homelinux/largo/checkers/Checkers.java b/org/homelinux/largo/checkers/Checkers.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/checkers/Checkers.java
@@ -0,0 +1,235 @@
+/**
+ *   $Id: Checkers.java 144 2008-04-25 13:09:35Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/checkers/Checkers.java $
+ */
+
+package org.homelinux.largo.checkers;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JSpinner;
+import javax.swing.SpinnerNumberModel;
+
+import org.homelinux.largo.games.board.MouseListener;
+import org.homelinux.largo.games.board.Point;
+import org.homelinux.largo.utils.BrowserLaunch;
+
+public class Checkers extends JFrame implements Runnable {
+	static final long serialVersionUID = 250408;
+	static final String helpURL = "http://largo.homelinux.org/trac/browser/eclipse/Schachspiel/trunk";
+
+	MouseListener listener = null;
+	KIBoard board = null;
+	Point p = null;
+	JLabel    human = new JLabel("<html><font size='5' color='#FFFFFF'>Human</font></html>");
+	JLabel computer = new JLabel("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+	JButton     neu = new JButton("Play");
+	JButton  pconly = new JButton("PC-PC");
+	JButton    back = new JButton("Back");
+	JButton forward = new JButton("For");
+	JButton    help = new JButton("Source");
+
+	SpinnerNumberModel model = new SpinnerNumberModel(4, 1, 8, 1);
+	JSpinner combo = new JSpinner(model);
+
+	JPanel panel;
+	JPanel fpanel;
+
+	int search_depth;
+
+	boolean pc_only;
+
+	public Checkers (int w, int h) {
+		super("Checkers by Largo Enterprises");
+		setDefaultCloseOperation (javax.swing.JFrame.EXIT_ON_CLOSE);
+		board = new KIBoard(w, h);
+
+		fpanel = new JPanel();
+		fpanel.add(back);
+		fpanel.add(neu);
+		fpanel.add(combo);
+		fpanel.add(pconly);
+		fpanel.add(help);
+		fpanel.add(forward);
+
+		panel = new JPanel();
+		panel.setLayout(new BorderLayout());
+		panel.add(human, "West");
+		panel.add(fpanel, "Center");
+		panel.add(computer, "East");
+
+		fpanel.setBackground(new Color(50, 100, 200));
+		panel.setBackground(new Color(50, 100, 200));
+
+		getContentPane().setLayout(new BorderLayout());
+		getContentPane().add(panel, "North");
+		getContentPane().add(board, "Center");
+
+		neu.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				human.setText("<html><font size='5' color='#FFFFFF'>Human</font></html>");
+				computer.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				pc_only = false;
+				board.init();
+				board.negateEstimation(false);
+			}
+		});
+
+		pconly.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				human.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				computer.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				pc_only = true;
+			}
+		});
+
+		back.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				board.backwards();
+			}
+		});
+
+		forward.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				board.forward();
+			}
+		});
+
+		help.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				BrowserLaunch browser = new BrowserLaunch();
+				browser.openURL(helpURL);
+			}
+		});
+
+		listener = board.getMouseListener();
+
+		pc_only = false;
+		search_depth = 3;
+		pack();
+	}
+
+	public void computer_play () {
+		while (pc_only) {
+			search_depth = model.getNumber().intValue()-1;
+
+			if ( !board.isBlacksTurn() ) {
+				human.setText("<html><font size='5' color='#FF3333'>Computer</font></html>");
+				board.negateEstimation(true);
+				if (!board.doBestMove(search_depth) ) {
+					pc_only = false;
+					return;
+				}
+				board.negateEstimation(false);
+				human.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				board.setBlacksTurn(true);
+			} else {
+				computer.setText("<html><font size='5' color='#FF3333'>Computer</font></html>");
+				if (!board.doBestMove(search_depth) ) {
+					pc_only = false;
+					return;
+				}
+				computer.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				board.setBlacksTurn(false);
+
+				if (board.simu_debug()) {
+					for (int i=0;i<64;i++) {
+						if((i+1)%8 == 0 )
+							System.err.printf("%2d=%d\n", i, board.getValue(i));
+						else
+							System.err.printf("%2d=%d ", i, board.getValue(i));
+					}
+				}
+
+				try {
+					Thread.sleep (10);
+				} catch (InterruptedException e) {
+					System.err.println("computer_play: " + e.getLocalizedMessage());
+					System.err.println("========================================================================");
+					e.printStackTrace();
+					System.err.println("========================================================================");
+					return;
+				}
+			}
+		}
+	}
+
+	public void run () {
+		for (;;) {
+
+			/* is this thread safe */
+			search_depth = model.getNumber().intValue()-1;
+
+			if (pc_only) {
+				computer_play ();
+			}
+
+			if ( !board.isBlacksTurn() ) {
+				if (listener.isSelected ()) {
+					p = listener.getSelection ();
+					if (board.move (p))
+						board.setBlacksTurn(true);
+				}
+				try {
+					Thread.sleep (50);
+				}
+				catch (InterruptedException e) {
+					System.err.println("Schach::run: " + e.getLocalizedMessage());
+					System.err.println("========================================================================");
+					e.printStackTrace();
+					System.err.println("========================================================================");
+					return;
+				}
+			} else {
+				human.setText("<html><font size='5' color='#FFFFFF'>Human</font></html>");
+				computer.setText("<html><font size='5' color='#FF3333'>Computer</font></html>");
+				board.doBestMove(search_depth);
+				human.setText("<html><font size='5' color='#FF3333'>Human</font></html>");
+				computer.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				board.setBlacksTurn(false);
+
+				if (board.simu_debug()) {
+					for (int i=0;i<64;i++) {
+						if((i+1)%8 == 0 )
+							System.out.printf("%2d=%d\n", i, board.getValue(i));
+						else
+							System.out.printf("%2d=%d ", i, board.getValue(i));
+					}
+				}
+			}
+		}
+	}
+
+	public static void main (String args[]) {
+		Checkers c = new Checkers (74, 74);
+
+		c.setResizable(false);
+		c.setVisible (true);
+
+		if (args.length == 1 ) {
+			if ( args[0].equals("full") )
+				c.board.setDebug(true, true);
+			else if ( args[0].equals("simu") )
+				c.board.setDebug(true, false);
+			else if ( args[0].equals("undo") )
+				c.board.setDebug(false, true);
+			else if ( args[0].equals("none") )
+				c.board.setDebug(false, false);
+			else {
+				System.out.println("   Chess: java -jar games.jar [full|simu|undo|none]");
+				System.out.println("Checkers: java -cp games.jar org.homelinux.largo.checkers.Checkers [full|simu|undo|none]");
+			}
+		}
+
+		Thread t = new Thread(c);
+		t.setPriority(Thread.NORM_PRIORITY-1);
+		t.start();
+	}
+}
diff --git a/org/homelinux/largo/checkers/KIBoard.java b/org/homelinux/largo/checkers/KIBoard.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/checkers/KIBoard.java
@@ -0,0 +1,202 @@
+/**
+ *   $Id: KIBoard.java 144 2008-04-25 13:09:35Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/checkers/KIBoard.java $
+ */
+
+package org.homelinux.largo.checkers;
+
+import org.homelinux.largo.games.board.Move;
+import org.homelinux.largo.games.board.checkersboard.CheckersBoard;
+
+public class KIBoard extends CheckersBoard {
+	static final long serialVersionUID = 250408;
+	static final int game_const = 500;
+
+	protected boolean SIMU_DEBUG  = false;
+	private boolean negate_estimation = false;
+
+	private Move bestMove;
+	private int desired_depth;
+
+	public KIBoard(int w, int h) {
+		super(w, h);
+		desired_depth = -1;
+	}
+
+	/**
+	 * Set the current DEBUG-Level:
+	 * simu: print all valid, simulated moves
+	 * undo: print all undos
+	 */
+	public void setDebug(boolean simu, boolean undo) {
+		SIMU_DEBUG = simu;
+		UNDO_DEBUG = undo;
+	}
+
+	public boolean simu_debug() {
+		return SIMU_DEBUG;
+	}
+
+	public boolean undo_debug() {
+		return UNDO_DEBUG;
+	}
+
+	/**
+	 * This function flips the sides: Player A maximizes and Player B minimizes
+	 */
+	public void negateEstimation(boolean b) {
+		negate_estimation = b;
+	}
+
+	/**
+	 * The Minimax-Algorithm works for TWO-PLAYER Games
+	 * Player A minimizes, Player B maximizes
+	 */
+	public int estimateFunction() {
+		int i;
+		int white = 0;
+		int black = 0;
+
+		for(i=0;i<64;i++) {
+			if (isWhite(i))
+				white+=getValue(i);
+			if (isBlack(i))
+				black+=getValue(i);
+		}
+
+		/**
+		 * solves ticket #3
+		 */
+		if ( negate_estimation )
+			return white-black;
+
+		return black-white;
+	}
+
+	/**
+	 * simulates and returns the next possible move for a Player or null, when no more moves are possible.
+	 * The Turn is flipped automatically if "simulate(...)" will find a valid move.
+	 */
+	Move simulate(int t, int o) {
+		Move move = null;
+		int value;
+
+		if ( validTurn(o) ) {
+			while ( t < 64 ) {
+				if (!simulateMove(t, o) ) {
+					t++;
+					continue;
+				}
+
+				value = estimateFunction();
+				move = new Move(value, t, o);
+
+				/* Flip Sides */
+				setBlacksTurn(!isBlacksTurn());
+				return move;
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * AlphaBeta-Algorithm: the Maximizer
+	 */
+	int max_alpha_beta (int depth, int alpha, int beta) {
+		int moveValue;
+		int o, t;
+		Move move = null;
+
+		if ( desired_depth == -1 )
+			desired_depth = depth;
+
+		for (o = 0; o < 64; o++) {
+			t=0;
+			while ( (move=simulate(t, o)) != null ) {
+				/* particular move from black */
+				t = move.target;
+
+				if ( depth == 0 || Math.abs(move.value) > game_const )
+					moveValue = move.value;
+				else /* best next move */
+					moveValue = min_alpha_beta(depth-1, alpha, beta);
+
+				undo();
+				t++;
+
+				if ( moveValue >= beta )
+					return beta;
+
+				if ( moveValue > alpha ) {
+					alpha = moveValue;
+					if ( depth == desired_depth )
+						bestMove = move;
+				}
+			}
+		}
+
+		return alpha;
+	}
+
+	/**
+	 * AlphaBeta-Algorithm: the Minimizer
+	 */
+	int min_alpha_beta(int depth, int alpha, int beta) {
+		int moveValue;
+		int o, t;
+		Move move = null;
+
+		for (o = 0; o < 64; o++) {
+			t=0;
+			while ( (move=simulate(t, o)) != null ) {
+				/* particular move from white */
+				t = move.target;
+
+				if ( depth == 0 || Math.abs(move.value) > game_const )
+					moveValue = move.value;
+				else /* best next move */
+					moveValue = max_alpha_beta(depth-1, alpha, beta);
+
+				undo();
+				t++;
+
+				if ( moveValue <= alpha )
+					return alpha;
+
+				if ( moveValue < beta )
+					beta = moveValue;
+			}
+		}
+
+		return beta;
+	}
+
+	/**
+	 * Evaluates the next, best Move after search_depth half-moves.
+	 * When the Machine has Black, set negateEstimation(false);
+	 * When the Machine has White, set negateEstimation(true);
+	 */
+	public boolean doBestMove(int search_depth) {
+		int value;
+
+		desired_depth = -1;
+		bestMove = null;
+		value = max_alpha_beta(search_depth, Integer.MIN_VALUE, Integer.MAX_VALUE);
+
+		if ( bestMove == null ) {
+			System.err.println("Computing once more...");
+			value = max_alpha_beta(1, Integer.MIN_VALUE, Integer.MAX_VALUE);
+			if (bestMove == null) {
+				System.out.println("Finito");
+				return false;
+			}
+		}
+
+		if (doMove(bestMove.target, bestMove.origin)) {
+			System.out.println("Next Move");
+			return true;
+		}
+
+		return false;
+	}
+}
diff --git a/org/homelinux/largo/games/board/Board.java b/org/homelinux/largo/games/board/Board.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/games/board/Board.java
@@ -0,0 +1,394 @@
+/**
+ *   $Id: Board.java 148 2008-04-25 22:05:48Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/Board.java $
+ */
+
+package org.homelinux.largo.games.board;
+
+import java.awt.Canvas;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Image;
+import java.util.Vector;
+
+public class Board extends Canvas {
+	static final long serialVersionUID = 140208;
+
+	protected boolean UNDO_DEBUG  = false;
+
+	protected Piece board_pieces[];
+	private Piece pieces[];
+
+	protected Vector<History> stack;
+	protected int moveNr;
+
+	protected static final int EMPTY = 0;
+
+	Color color_black;
+	Color color_white;
+
+	int iHeight;
+	int iWidth;
+	int xPos;
+	int yPos;
+
+	boolean black;
+	boolean blacksTurn;
+
+	MouseListener listener = null;
+
+	/**
+	 * The init method initializes an empty board with a history.
+	 */
+	public void init() {
+		int i;
+		pieces = new Piece[64];
+
+		for (i = 0; i < 64; i++) {
+			pieces[i] = new Piece(null, null, EMPTY, 0);
+		}
+
+		xPos = 0;
+		yPos = 0;
+
+		black = false;
+		blacksTurn = false;
+		board_pieces = getPieces(pieces);
+		stack = new Vector<History>();
+		moveNr = 0;
+	}
+
+	public Board (int w, int h) {
+		iWidth = w;
+		iHeight = h;
+		color_white = new Color (255, 255, 255);
+		color_black = new Color (50, 100, 200);
+		setPreferredSize (new Dimension(8 * iWidth, 8 * iHeight));
+
+		init();
+		listener = new MouseListener(iWidth, iHeight);
+		addMouseListener(listener);
+	}
+
+	/**
+	 * getPiece returns a Piece-Object from the Board Cache. It might not be visible on the current board.
+	 */
+	public Piece getPiece(int t) {
+		return pieces[t];
+	}
+
+	/**
+	 * setPiece sets a Piece-Object into the Board Cache and will not be visible.
+	 */
+	protected void setPiece(int t, Piece p) {
+		pieces[t] = p;
+	}
+
+	protected Piece[] getPieces() {
+		return getPieces(pieces);
+	}
+
+	private Piece[] getPieces(Piece[] which_pieces) {
+		Piece[] p = new Piece[64];
+		int i;
+
+		for ( i=0;i<64;i++)
+			p[i] = new Piece(which_pieces[i]);
+
+		return p;
+	}
+
+	protected void setPieces(Piece[] p) {
+		pieces = p;
+	}
+
+	/**
+	 * needed in paint(Graphics g)
+	 */
+	private Image getBoardImage (int i) {
+		return board_pieces[i].image;
+	}
+
+	/**
+	 * getMouseListener returns a valid MouseListener for this Board.
+	 */
+	public MouseListener getMouseListener() {
+		return listener;
+	}
+
+	/**
+	 * currentMove returns the current stack.size().
+	 */
+	public int currentMove() {
+		return stack.size();
+	}
+
+	/**
+	 * returns the color of piece[i].
+	 */
+	public String getColor(int i) {
+		return pieces[i].color;
+	}
+
+	/**
+	 * returns the current Value of a particular piece.
+	 */
+	public int getValue(int i) {
+		return pieces[i].value;
+	}
+
+	/**
+	 * Defined Integer Constants: EMTPY = 0
+	 */
+	public int getType(int i) {
+		return pieces[i].type;
+	}
+
+	public boolean isEmpty (int i) {
+		if (pieces[i].type == EMPTY)
+			return true;
+		return false;
+	}
+
+	boolean BoardisEmpty (int i) {
+		if (board_pieces[i].type == EMPTY)
+			return true;
+		return false;
+	}
+
+	/**
+	 * blacksTurn = true  -> Black moves
+	 * blacksTurn = false -> White moves
+	 */
+	public boolean isBlacksTurn() {
+		return blacksTurn;
+	}
+
+	public void setBlacksTurn(boolean b) {
+		blacksTurn = b;
+	}
+
+	/**
+	 * returns true, when piece[i] is white
+	 */
+	public boolean isWhite(int i) {
+		if ( isEmpty(i) )
+			return false;
+
+		if ( pieces[i].color.equals ("white") )
+			return true;
+		return false;
+	}
+
+	/**
+	 * returns true, when piece[i] is black
+	 */
+	public boolean isBlack(int i) {
+		if ( isEmpty(i) )
+			return false;
+
+		if ( pieces[i].color.equals ("black") )
+			return true;
+		return false;
+	}
+
+	/**
+	 * returns true, when both pieces have opposite colors
+	 */
+	public boolean isEnemy(int t, int o) {
+		if ( isEmpty(t) )
+			return false;
+
+		if (!pieces[t].color.equals (pieces[o].color) )
+			return true;
+		return false;
+	}
+
+	/**
+	 * returns true, when both pieces have the same color
+	 */
+	public boolean isSamePiece(int t, int o) {
+		if ( isEmpty(t) )
+			return false;
+
+		if (pieces[t].color.equals (pieces[o].color) )
+			return true;
+		return false;
+	}
+
+	/**
+	 * This function checks for the color of the piece at piece[i] and returns true,
+	 * if the color matches the current Turn.
+	 */
+	public boolean validTurn(int i) {
+		if ( isEmpty(i) )
+			return false;
+
+		if ( getColor(i).equals("white") && isBlacksTurn() )
+			return false;
+		if ( getColor(i).equals("black") && !isBlacksTurn() )
+			return false;
+		return true;
+	}
+
+	/**
+	 * simulates a "valid" move or returns false.
+	 * all changes are relative to pieces and will not be painted.
+	 * This method sets internal variables for the rochade() method, which will be overidden.
+	 */
+	public boolean simulateMove(int t, int o) {
+		if ( !validMove(t, o) ) {
+			return false;
+		}
+
+		push(pieces[t], t, pieces[o], o);
+
+		pieces[t] = new Piece(pieces[o]);
+		pieces[o] = new Piece(null, null, EMPTY, 0);
+
+		return true;
+	}
+
+	/**
+	 * Moves a Piece on the Board at Point p
+	 */
+	public boolean move (Point p) {
+		int t;
+		int o;
+
+		t = (p.endy * 8) + p.endx;
+		o = (p.starty * 8) + p.startx;
+
+		if ( t < 0 || t > 63 )
+			return false;
+		if ( o < 0 || o > 63 )
+			return false;
+
+		if (validTurn(o))
+			return doMove (t, o);
+
+		System.out.println("It's not your turn!");
+		return false;
+	}
+
+	/**
+	 * Moves one half-move backward.
+	 */
+	public void backwards() {
+		History h1 = null;
+		History h2 = null;
+
+		if ( moveNr < 2)
+			return;
+
+		moveNr -= 2;
+
+		h1 = stack.elementAt(moveNr);
+		h2 = stack.elementAt(moveNr+1);
+
+		board_pieces[h1.pos] = h1.piece;
+		board_pieces[h2.pos] = h2.piece;
+
+		repaint();
+	}
+
+	/**
+	 * Moves one half-move forward.
+	 */
+	public void forward() {
+		History h1 = null;
+		History h2 = null;
+
+		if ( moveNr > stack.size()-2 )
+			return;
+
+		h1 = stack.elementAt(moveNr);
+		h2 = stack.elementAt(moveNr+1);
+
+		board_pieces[h1.pos] = h2.piece;
+		board_pieces[h2.pos] = new Piece(null, null, EMPTY, 0);
+
+		moveNr += 2;
+		repaint();
+	}
+
+	/**
+	 * pushes 2 pieces onto the stack.
+	 */
+	public void push(Piece p1, int t, Piece p2, int o) {
+		stack.add(new History(p1, t, isBlacksTurn()));
+		stack.add(new History(p2, o, isBlacksTurn()));
+	}
+
+	/**
+	 * pop: undo the push operation.
+	 */
+	public void undo() {
+		History h1 = null;
+		History h2 = null;
+		int size = stack.size();
+
+		if ( size < 2 )
+			return;
+
+		h1 = stack.elementAt(size-1);
+		h2 = stack.elementAt(size-2);
+
+		pieces[h1.pos] = h1.piece;
+		pieces[h2.pos] = h2.piece;
+
+		stack.setSize(size-2);
+
+		/* Reset the current player */
+		setBlacksTurn(h2.turn);
+	}
+
+	/**
+	 * This method must be implemented in your "GameBoard"
+	 * Return value:  TRUE: the move IS possible
+	 * Return value: FALSE: the move IS NOT possible
+	 */
+	public boolean validMove(int t, int o) {
+		System.out.println("public boolean validMove(int t, int o): Implement me");
+		return false;
+	}
+
+	/**
+	 * This method must be implemented in your "GameBoard"
+	 * Return value:  TRUE: the move was performed
+	 * Return value: FALSE: the move was not performed
+	 */
+	public boolean doMove(int t, int o) {
+		System.out.println("public boolean doMove(int t, int o): Implement me");
+		return false;
+	}
+
+	public void update(Graphics g){
+		paint(g);
+	}
+
+	public void paint (Graphics g) {
+		for (int i = 0; i < 8; i++) {
+			for (int j = 0; j < 8; j++) {
+				if (black == true) {
+					g.setColor (color_black);
+					g.fillRect (xPos, yPos, iWidth, iHeight);
+					black = false;
+				} else {
+					g.setColor (color_white);
+					g.fillRect (xPos, yPos, iWidth, iHeight);
+					black = true;
+				}
+				if ( !BoardisEmpty ((i * 8) + j) )
+					g.drawImage (getBoardImage ((i * 8) + j), xPos + 5, yPos, this);
+				xPos += iWidth;
+			}
+			xPos = 0;
+			yPos += iHeight;
+			black = !black;
+		}
+		xPos = 0;
+		yPos = 0;
+	}
+}
diff --git a/org/homelinux/largo/games/board/History.java b/org/homelinux/largo/games/board/History.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/games/board/History.java
@@ -0,0 +1,32 @@
+/**
+ *  $Id: History.java 150 2008-04-26 01:18:25Z mbroeker $
+ * $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/History.java $
+ */
+
+package org.homelinux.largo.games.board;
+
+import org.homelinux.largo.games.board.Piece;
+
+public class History {
+	Piece piece;
+	int pos;
+	boolean turn;
+
+	public History(Piece p, int n, boolean t) {
+		piece = new Piece(p);
+		pos = n;
+		turn = t;
+	}
+
+	public Piece piece() {
+		return piece;
+	}
+
+	public int pos() {
+		return pos;
+	}
+
+	public boolean turn() {
+		return turn;
+	}
+}
diff --git a/org/homelinux/largo/games/board/MouseListener.java b/org/homelinux/largo/games/board/MouseListener.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/games/board/MouseListener.java
@@ -0,0 +1,54 @@
+/**
+ *   $Id: MouseListener.java 140 2008-04-25 07:03:13Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/MouseListener.java $
+ */
+
+package org.homelinux.largo.games.board;
+
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+public class MouseListener extends MouseAdapter {
+	int width;
+	int height;
+	int delta;
+
+	Point p;
+	boolean selected;
+
+	public MouseListener (int w, int h) {
+		width = w;
+		height = h;
+		p = new Point ();
+		selected = false;
+	}
+
+	public void mousePressed (MouseEvent e) {
+		p.startx = (e.getX () / width);
+		p.starty = (e.getY () / height);
+		selected = false;
+	}
+
+	public void mouseReleased (MouseEvent e) {
+		p.endx = (e.getX () / width);
+		p.endy = (e.getY () / height);
+
+		print();
+		selected = true;
+	}
+
+	public boolean isSelected () {
+		return selected;
+	}
+
+	public Point getSelection () {
+		selected = false;
+		return p;
+	}
+
+	public void print() {
+		System.out.printf ("%c%d-%c%d \t",
+				(char)('A' + p.startx), 8-p.starty,
+				(char)('A' + p.endx), 8-p.endy);
+	}
+}
diff --git a/org/homelinux/largo/games/board/Move.java b/org/homelinux/largo/games/board/Move.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/games/board/Move.java
@@ -0,0 +1,18 @@
+/**
+ *   $Id: Move.java 138 2008-04-25 04:37:08Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/Move.java $
+ */
+
+package org.homelinux.largo.games.board;
+
+public class Move extends Object {
+	public int value;
+	public int target;
+	public int origin;
+
+	public Move(int v, int t, int o) {
+		value = v;
+		target = t;
+		origin = o;
+	}
+}
diff --git a/org/homelinux/largo/games/board/Piece.java b/org/homelinux/largo/games/board/Piece.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/games/board/Piece.java
@@ -0,0 +1,29 @@
+/**
+ *   $Id: Piece.java 138 2008-04-25 04:37:08Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/Piece.java $
+ */
+
+package org.homelinux.largo.games.board;
+
+import java.awt.Image;
+
+public class Piece extends Object {
+	Image image;
+	String color;
+	int type;
+	int value;
+
+	public Piece(Piece s) {
+		image = s.image;
+		color = s.color;
+		type = s.type;
+		value = s.value;
+	}
+
+	public Piece(Image img, String c, int t, int v) {
+		image = img;
+		color = c;
+		type = t;
+		value = v;
+	}
+}
diff --git a/org/homelinux/largo/games/board/Point.java b/org/homelinux/largo/games/board/Point.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/games/board/Point.java
@@ -0,0 +1,13 @@
+/**
+ *   $Id: Point.java 140 2008-04-25 07:03:13Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/Point.java $
+ */
+
+package org.homelinux.largo.games.board;
+
+public class Point {
+	int startx;
+	int starty;
+	int endx;
+	int endy;
+};
diff --git a/org/homelinux/largo/games/board/checkersboard/CheckersBoard.java b/org/homelinux/largo/games/board/checkersboard/CheckersBoard.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/games/board/checkersboard/CheckersBoard.java
@@ -0,0 +1,299 @@
+/**
+ *   $Id: CheckersBoard.java 152 2008-04-27 02:04:31Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/checkersboard/CheckersBoard.java $
+ */
+
+package org.homelinux.largo.games.board.checkersboard;
+
+import java.awt.Image;
+
+import org.homelinux.largo.games.board.Board;
+import org.homelinux.largo.games.board.History;
+import org.homelinux.largo.games.board.Piece;
+import org.homelinux.largo.utils.ImgComponent;
+
+public class CheckersBoard extends Board {
+	static final long serialVersionUID = 250408;
+
+	static final int PIECE = 1;
+	static final int QUEEN = 2;
+
+	final Piece white_super_sun =
+		new Piece(new ImgComponent("images/white_super_sun.png").getImage(), "white", QUEEN, 50);
+
+	final Piece black_super_sun =
+		new Piece(new ImgComponent("images/black_super_sun.png").getImage(), "black", QUEEN, 50);
+
+	void initBoard () {
+		for (int i=1;i<8;i+=2)
+			add (new ImgComponent ("images/black_sun.png").getImage (), i, "black", PIECE);
+		for (int i=8;i<15;i+=2)
+			add (new ImgComponent ("images/black_sun.png").getImage (), i, "black", PIECE);
+		for (int i=17;i<=23;i+=2)
+			add (new ImgComponent ("images/black_sun.png").getImage (), i, "black", PIECE);
+
+		for (int i=40;i<47;i+=2)
+			add (new ImgComponent ("images/white_sun.png").getImage (), i, "white", PIECE);
+		for (int i=49;i<=55;i+=2)
+			add (new ImgComponent ("images/white_sun.png").getImage (), i, "white", PIECE);
+		for (int i=56;i<63;i+=2)
+			add (new ImgComponent ("images/white_sun.png").getImage (), i, "white", PIECE);
+	}
+
+	/**
+	 * The init method initializes a complete checkers board with figures and a history.
+	 */
+	public void init() {
+		super.init();
+		initBoard();
+		board_pieces = getPieces();
+		repaint();
+	}
+
+	public CheckersBoard (int w, int h) {
+		super(w, h);
+	}
+
+	void add (Image img, int i, String c, int t) {
+		int v = 0;
+
+		switch(t) {
+		case PIECE:
+			v=10;
+		}
+
+		setPiece(i, new Piece(img, c, t, v));
+	}
+
+	/**
+	 * Checks, wether this move is possible or not.
+	 */
+	public boolean validMove (int t, int o) {
+		int steps;
+		int rows;
+		int dx;
+
+		if ( t == o )
+			return false;
+
+		if (isSamePiece(t, o))
+			return false;
+
+		if (getType(o) == EMPTY)
+			return false;
+
+		/*
+		 *	00 01 02 03 04 05 06 07
+		 *	08 09 10 11 12 13 14 15
+		 *	16 17 18 19 20 21 22 23
+		 *	24 25 26 27 28 29 30 31
+		 *	32 33 34 35 36 37 38 39
+		 *	40 41 42 43 44 45 46 47
+		 *	48 49 50 51 52 53 54 55
+		 *	56 57 58 59 60 61 62 63
+		 */
+
+		steps = Math.abs(t-o);
+		rows = Math.abs(t/8 - o/8);
+
+		switch( getType(o) ) {
+		case PIECE:
+			if (steps % 7 == 0 ) {
+				if (steps == 7 && rows == 1 && isEmpty(t)) {
+					if ( isBlack(o) && (t>o) )
+						return true;
+					if ( isWhite(o) && (t<o) )
+						return true;
+				}
+
+				if (steps == 14 && rows == 2  && isEmpty(t)) {
+					if ( isBlack(o) && (t>o) && isEnemy(o+7, o) )
+						return true;
+					if ( isWhite(o) && (t<o) && isEnemy(o-7, o) )
+						return true;
+				}
+			}
+
+			if (steps % 9 == 0 ) {
+				if (steps == 9 && rows == 1 && isEmpty(t)) {
+					if ( isBlack(o) && (t>o) )
+						return true;
+					if ( isWhite(o) && (t<o) )
+						return true;
+				}
+
+				if (steps == 18 && rows == 2  && isEmpty(t)) {
+					if ( isBlack(o) && (t>o) && isEnemy(o+9, o) )
+						return true;
+					if ( isWhite(o) && (t<o) && isEnemy(o-9, o) )
+						return true;
+				}
+			}
+			break;
+		case QUEEN:
+			if (steps % 7 == 0 && isEmpty(t) ) {
+				if (steps == 7 && rows == 1)
+					return true;
+				if (steps == 14 && rows == 2)
+					return true;
+				if (steps == 21 && rows == 3)
+					return true;
+				if (steps == 28 && rows == 4)
+					return true;
+				if (steps == 35 && rows == 5)
+					return true;
+				if (steps == 42 && rows == 6)
+					return true;
+				if (steps == 49 && rows == 7)
+					return true;
+			}
+
+			if (steps % 9 == 0 && isEmpty(t) ) {
+				if (steps == 9 && rows == 1)
+					return true;
+				if (steps == 18 && rows == 2)
+					return true;
+				if (steps == 27 && rows == 3)
+					return true;
+				if (steps == 36 && rows == 4)
+					return true;
+				if (steps == 45 && rows == 5)
+					return true;
+				if (steps == 54 && rows == 6)
+					return true;
+				if (steps == 63 && rows == 7)
+					return true;
+			}
+			break;
+		}
+		return false;
+	}
+
+	/**
+	 * pop: undo the push operation.
+	 */
+	public void undo() {
+		History h1 = null;
+		History h2 = null;
+		int size = stack.size();
+		int pos;
+
+		if ( size < 2 )
+			return;
+
+		h1 = stack.elementAt(size-1);
+		h2 = stack.elementAt(size-2);
+
+		setPiece(h1.pos(), h1.piece());
+		setPiece(h2.pos(), h2.piece());
+
+		if ( getType(h2.pos()) != EMPTY ) {
+			pos = 2*h2.pos()-h1.pos();
+			if ( pos >= 0 && pos <64)
+				setPiece(pos, new Piece(null, null, EMPTY, 0));
+		}
+
+		stack.setSize(size-2);
+
+		/* Reset the current player */
+		setBlacksTurn(h2.turn());
+	}
+
+	/**
+	 * simulates a "valid" move or returns false.
+	 * all changes are relative to pieces and will not be painted.
+	 */
+	public boolean simulateMove(int t, int o) {
+		int steps = Math.abs(t-o);
+		int rows = Math.abs(t/8 - o/8);
+		int pos;
+
+		if ( !validMove(t, o) ) {
+			return false;
+		}
+
+		if ( rows == 2 && getType(o) == PIECE) {
+			pos =  (t-o)/2 + o;
+			push(getPiece(pos), pos, getPiece(o), o);
+			setPiece(pos, new Piece(null, null, EMPTY, 0));
+		} else
+			push(getPiece(t), t, getPiece(o), o);
+
+		setPiece(t, new Piece(getPiece(o)));
+		setPiece(o, new Piece(null, null, EMPTY, 0));
+
+		return true;
+	}
+
+	/**
+	 * performs a "valid" move or returns false.
+	 * all changes are relative to board_pieces and will be painted.
+	 */
+	public boolean doMove(int t, int o) {
+		int steps = Math.abs(t-o);
+		int rows = Math.abs(t/8-o/8);
+		int pos;
+
+		if ( !validMove(t, o) ) {
+			return false;
+		}
+
+		if ( rows == 2 && getType(o) == PIECE) {
+			pos =  (t-o)/2 + o;
+			push(getPiece(pos), pos, getPiece(o), o);
+			setPiece(pos, new Piece(null, null, EMPTY, 0));
+		} else	if ( rows >= 2 && getType(o) == QUEEN ) {
+			if (steps % 7 == 0 ) {
+				if ( t > o )
+					for ( pos=o+7;pos <= t-7;pos+=7 ) {
+						if ( isEnemy(pos, o) ) {
+							push(getPiece(pos), pos, getPiece(o), o);
+							setPiece(pos, new Piece(null, null, EMPTY, 0));
+						}
+					}
+				else {
+					for ( pos=o-7;pos >= t+7;pos-=7 ) {
+						if ( isEnemy(pos, o) ) {
+							push(getPiece(pos), pos, getPiece(o), o);
+							setPiece(pos, new Piece(null, null, EMPTY, 0));
+						}
+					}
+				}
+			}
+
+			if (steps % 9 == 0 ) {
+				if ( t > o )
+					for ( pos=o+9;pos <= t-9;pos+=9 ) {
+						if ( isEnemy(pos, o) ) {
+							push(getPiece(pos), pos, getPiece(o), o);
+							setPiece(pos, new Piece(null, null, EMPTY, 0));
+						}
+					}
+				else {
+					for ( pos=o-9;pos >= t+9;pos-=9 ) {
+						if ( isEnemy(pos, o) ) {
+							push(getPiece(pos), pos, getPiece(o), o);
+							setPiece(pos, new Piece(null, null, EMPTY, 0));
+						}
+					}
+				}
+			}
+		}
+
+		if ( t <= 7 && getType(o) == PIECE)
+			setPiece(t, new Piece(white_super_sun));
+		else if (t >=56 && getType(o) == PIECE)
+			setPiece(t, new Piece(black_super_sun));
+		else
+			setPiece(t, new Piece(getPiece(o)));
+
+		setPiece(o, new Piece(null, null, EMPTY, 0));
+
+		board_pieces = getPieces();
+		repaint();
+
+		moveNr = stack.size();
+
+		return true;
+	}
+}
diff --git a/org/homelinux/largo/games/board/chessboard/ChessBoard.java b/org/homelinux/largo/games/board/chessboard/ChessBoard.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/games/board/chessboard/ChessBoard.java
@@ -0,0 +1,659 @@
+/**
+ *   $Id: ChessBoard.java 152 2008-04-27 02:04:31Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/chessboard/ChessBoard.java $
+ */
+
+package org.homelinux.largo.games.board.chessboard;
+
+import java.awt.Image;
+
+import org.homelinux.largo.games.board.Board;
+import org.homelinux.largo.games.board.Piece;
+import org.homelinux.largo.utils.ImgComponent;
+
+public class ChessBoard extends Board {
+	static final long serialVersionUID = 140208;
+
+	static final int ROOK = 1;
+	static final int KNIGHT = 2;
+	static final int BISHOP = 3;
+	static final int QUEEN = 4;
+	static final int KING = 5;
+	static final int PAWN = 6;
+
+	final Piece white_queen = new Piece(new ImgComponent("images/white_queen.png").getImage(),
+					"white", QUEEN, 90);
+	final Piece black_queen = new Piece(new ImgComponent("images/black_queen.png").getImage(), 
+					"black", QUEEN, 90);
+
+	boolean white_rochades_small;
+	boolean white_rochades_big;
+	boolean black_rochades_small;
+	boolean black_rochades_big;
+
+	void initBoard () {
+		add (new ImgComponent ("images/black_rook.png").getImage (), 0, "black", ROOK);
+		add (new ImgComponent ("images/black_knight.png").getImage (), 1, "black", KNIGHT);
+		add (new ImgComponent ("images/black_bishop.png").getImage (), 2, "black", BISHOP);
+		add (new ImgComponent ("images/black_queen.png").getImage (), 3, "black", QUEEN);
+		add (new ImgComponent ("images/black_king.png").getImage (), 4, "black", KING);
+		add (new ImgComponent ("images/black_bishop.png").getImage (), 5, "black", BISHOP);
+		add (new ImgComponent ("images/black_knight.png").getImage (), 6, "black", KNIGHT);
+		add (new ImgComponent ("images/black_rook.png").getImage (), 7, "black", ROOK);
+
+		for (int i = 0; i < 8; i++)
+			add (new ImgComponent ("images/black_pawn.png").getImage (), 8 + i, "black", PAWN);
+
+		add (new ImgComponent ("images/white_rook.png").getImage (), 56, "white", ROOK);
+		add (new ImgComponent ("images/white_knight.png").getImage (), 57, "white", KNIGHT);
+		add (new ImgComponent ("images/white_bishop.png").getImage (), 58, "white", BISHOP);
+		add (new ImgComponent ("images/white_queen.png").getImage (), 59, "white", QUEEN);
+		add (new ImgComponent ("images/white_king.png").getImage (), 60, "white", KING);
+		add (new ImgComponent ("images/white_bishop.png").getImage (), 61, "white", BISHOP);
+		add (new ImgComponent ("images/white_knight.png").getImage (), 62, "white", KNIGHT);
+		add (new ImgComponent ("images/white_rook.png").getImage (), 63, "white", ROOK);
+
+		for (int i = 0; i < 8; i++)
+			add (new ImgComponent ("images/white_pawn.png").getImage (), 55 - i, "white", PAWN);
+	}
+
+	/**
+	 * The init method initializes a complete chess board with figures and a history.
+	 */
+	public void init() {
+		super.init();
+		initBoard();
+		board_pieces = getPieces();
+		repaint();
+	}
+
+	public ChessBoard (int w, int h) {
+		super(w, h);
+	}
+
+	void add (Image img, int i, String c, int t) {
+		int v = 0;
+
+		switch (t) {
+		case ROOK:
+			v = 40;
+			break;
+		case KNIGHT:
+			v = 30;
+			break;
+		case BISHOP:
+			v = 30;
+			break;
+		case QUEEN:
+			v = 90;
+			break;
+		case KING:
+			v = 500;
+			break;
+		case PAWN:
+			v = 10;
+			break;
+		}
+
+		setPiece(i, new Piece(img, c, t, v));
+	}
+
+	/**
+	 * returns true, when the white king is at pieces[i]
+	 */
+	public boolean isWhiteKing(int i) {
+		if ( isWhite(i) && getType(i) == KING)
+			return true;
+		return false;
+	}
+
+	/**
+	 * returns true, when the black king is at pieces[i]
+	 */
+	public boolean isBlackKing(int i) {
+		if ( isBlack(i) && getType(i) == KING)
+			return true;
+		return false;
+	}
+
+	/**
+	 * Returns the score of the current position
+	 * Every field controlled by [color] gives one point
+	 * A King, controlled by [color], gives 10 extra points
+	 */
+	public int controls(String color) {
+		int t, o;
+		int value = 0;
+
+		for ( o=0;o<64;o++) {
+			if (color.equals(getColor(o))) {
+				for (t=0;t<64;t++) {
+					if(validMove(t, o)) {
+						if ( getType(t) == KING )
+							value+=10;
+						value++;
+					}
+				}
+			}
+		}
+		return value;
+	}
+
+	/**
+	 * Checks, wether this move is possible or not.
+	 */
+	public boolean validMove (int t, int o) {
+		int steps;
+		int rows;
+		int dx;
+
+		/* Must be here */
+		white_rochades_small = false;
+		white_rochades_big = false;
+		black_rochades_small = false;
+		black_rochades_big = false;
+
+		if ( t == o )
+			return false;
+
+		if (isSamePiece(t, o))
+			return false;
+
+		if (getType(o) == EMPTY)
+			return false;
+
+		/*
+		 *	00 01 02 03 04 05 06 07
+		 *	08 09 10 11 12 13 14 15
+		 *	16 17 18 19 20 21 22 23
+		 *	24 25 26 27 28 29 30 31
+		 *	32 33 34 35 36 37 38 39
+		 *	40 41 42 43 44 45 46 47
+		 *	48 49 50 51 52 53 54 55
+		 *	56 57 58 59 60 61 62 63
+		 */
+
+		steps = Math.abs(t-o);
+		rows = Math.abs(t/8 - o/8);
+
+		switch( getType(o) ) {
+		case ROOK:
+			if (steps < 8 && rows == 0 ) {
+				if(t>o)
+					for ( dx = o+1; dx < t; dx++ ) {
+						if ( getColor(dx) != null ) {
+							return false;
+						}
+					}
+				else
+					for ( dx = o-1; dx > t; dx-- ) {
+						if ( getColor(dx) != null ) {
+							return false;
+						}
+					}
+				return true;
+			}
+			if (steps % 8 == 0 ) {
+				if ( t>o ) {
+					for ( dx = o+8;  dx < t; dx+=8 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				} else {
+					for ( dx = o-8;  dx > t; dx-=8 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				}
+				if (steps == 8 && rows == 1)
+					return true;
+				if (steps == 16 && rows == 2)
+					return true;
+				if (steps == 24 && rows == 3)
+					return true;
+				if (steps == 32 && rows == 4)
+					return true;
+				if (steps == 40 && rows == 5)
+					return true;
+				if (steps == 48 && rows == 6)
+					return true;
+				if (steps == 56 && rows == 7)
+					return true;
+			}
+			break;
+		case KNIGHT:
+			/* works fine */
+			if (steps == 6 && rows == 1)
+				return true;
+			if (steps == 10 && rows == 1)
+				return true;
+			if (steps == 15 && rows == 2)
+				return true;
+			if (steps == 17 && rows == 2)
+				return true;
+			break;
+		case BISHOP:
+			if (steps % 7 == 0 ) {
+				if ( t>o ) {
+					for ( dx = o+7;  dx < t; dx+=7 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				} else {
+					for ( dx = o-7;  dx > t; dx-=7 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				}
+				if (steps == 7 && rows == 1)
+					return true;
+				if (steps == 14 && rows == 2)
+					return true;
+				if (steps == 21 && rows == 3)
+					return true;
+				if (steps == 28 && rows == 4)
+					return true;
+				if (steps == 35 && rows == 5)
+					return true;
+				if (steps == 42 && rows == 6)
+					return true;
+				if (steps == 49 && rows == 7)
+					return true;
+			}
+			if (steps % 9 == 0 ) {
+				if ( t>o ) {
+					for ( dx = o+9;  dx < t; dx+=9 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				} else {
+					for ( dx = o-9; dx > t; dx-=9 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				}
+				if (steps == 9 && rows == 1)
+					return true;
+				if (steps == 18 && rows == 2)
+					return true;
+				if (steps == 27 && rows == 3)
+					return true;
+				if (steps == 36 && rows == 4)
+					return true;
+				if (steps == 45 && rows == 5)
+					return true;
+				if (steps == 54 && rows == 6)
+					return true;
+				if (steps == 63 && rows == 7)
+					return true;
+			}
+			break;
+
+		case QUEEN:
+			if (steps < 8 && rows == 0 ) {
+				if(t>o)
+					for ( dx = o+1; dx < t; dx++ ) {
+						if ( getColor(dx) != null )
+							return false;
+					}
+				else
+					for ( dx = o-1; dx > t; dx-- ) {
+						if ( getColor(dx) != null )
+							return false;
+					}
+				return true;
+			}
+
+			if (steps % 8 == 0 ) {
+				if ( t>o ) {
+					for ( dx = o+8;  dx < t; dx+=8 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				} else {
+					for ( dx = o-8;  dx > t; dx-=8 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				}
+
+				if (steps == 8 && rows == 1)
+					return true;
+				if (steps == 16 && rows == 2)
+					return true;
+				if (steps == 24 && rows == 3)
+					return true;
+				if (steps == 32 && rows == 4)
+					return true;
+				if (steps == 40 && rows == 5)
+					return true;
+				if (steps == 48 && rows == 6)
+					return true;
+				if (steps == 56 && rows == 7)
+					return true;
+			}
+			if (steps % 7 == 0 ) {
+				if ( t>o ) {
+					for ( dx = o+7;  dx < t; dx+=7 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				} else {
+					for ( dx = o-7;  dx > t; dx-=7 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				}
+				if (steps == 7 && rows == 1)
+					return true;
+				if (steps == 14 && rows == 2)
+					return true;
+				if (steps == 21 && rows == 3)
+					return true;
+				if (steps == 28 && rows == 4)
+					return true;
+				if (steps == 35 && rows == 5)
+					return true;
+				if (steps == 42 && rows == 6)
+					return true;
+				if (steps == 49 && rows == 7)
+					return true;
+			}
+
+			if (steps % 9 == 0 ) {
+				if ( t>o ) {
+					for ( dx = o+9;  dx < t; dx+=9 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				} else {
+					for ( dx = o-9;  dx > t; dx -=9 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				}
+				if (steps == 9 && rows == 1)
+					return true;
+				if (steps == 18 && rows == 2)
+					return true;
+				if (steps == 27 && rows == 3)
+					return true;
+				if (steps == 36 && rows == 4)
+					return true;
+				if (steps == 45 && rows == 5)
+					return true;
+				if (steps == 54 && rows == 6)
+					return true;
+				if (steps == 63 && rows == 7)
+					return true;
+			}
+			break;
+
+		case KING:
+			if ( (steps == 1) && (rows == 0) )
+				return true;
+
+			if ( (steps == 8) && (rows == 1) )
+				return true;
+
+			if ( (steps == 7) && (rows == 1) )
+				return true;
+
+			if ( (steps == 9) && (rows == 1) )
+				return true;
+
+			if ( (steps == 2) && (rows == 0) ) {
+				if ( isWhiteKing(o) ) {		/* White: Rochade */
+					if ( isWhiteKing(60) && isEmpty(61) && isEmpty(62) && (t==62) ) {
+						if ( (getType(63) == ROOK) && isWhite(63) ) {
+							white_rochades_small = true;
+							return true;
+						}
+					}
+
+					if ( isWhiteKing(60) && isEmpty(59) && isEmpty(58) && isEmpty(57) && (t==58) ) {
+						if ( (getType(56) == ROOK) && isWhite(56) ) {
+							white_rochades_big = true;
+							return true;
+						}
+					}
+				}
+
+				if ( isBlackKing(o) ) {		/* Black: Rochade */
+					if ( isBlackKing(4) && isEmpty(5) && isEmpty(6) && (t==6) ) {
+						if ( (getType(7) == ROOK) && isBlack(7) ) {
+							black_rochades_small = true;
+							return true;
+						}
+					}
+
+					if ( isBlackKing(4) && isEmpty(3) && isEmpty(2) && isEmpty(1) && (t==2) ) {
+						if ( (getType(0) == ROOK) && isBlack(0) ) {
+							black_rochades_big = true;
+							return true;
+						}
+					}
+				}
+			}
+			break;
+
+		case PAWN:
+			if (getColor(o).equals("white")) {
+				if (steps == 7 && rows == 1 && isEnemy(t, o) && t<o)
+					return true;
+
+				if (steps == 9 && rows == 1 && isEnemy(t, o) && t<o)
+					return true;
+			} else {
+				if (steps == 7 && rows == 1 && isEnemy(t, o) && t>o)
+					return true;
+
+				if (steps == 9 && rows == 1 && isEnemy(t, o) && t>o)
+					return true;
+			}
+
+			if (steps % 8 == 0 ) {
+				if ( t>o ) {
+					for ( dx = o+8;  dx <= t; dx+=8 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				} else {
+					for ( dx = o-8; dx >= t; dx-=8 ) {
+						if (getColor(dx) != null)
+							return false;
+					}
+				}
+
+				if (steps == 8 && rows == 1) {
+					if ( getColor(o).equals("white") && t < o )
+						return true;
+					if ( getColor(o).equals("black") && t > o )
+						return true;
+				}
+
+				if (steps == 16 && rows == 2 && (o>= 8 && o <=15) ) {
+					if ( getColor(o).equals("white") && t < o )
+						return true;
+					if ( getColor(o).equals("black") && t > o )
+						return true;
+				}
+
+				if (steps == 16 && rows == 2 && (o>=48 && o <=55) ) {
+					if ( getColor(o).equals("white") && t < o )
+						return true;
+					if ( getColor(o).equals("black") && t > o )
+						return true;
+				}
+			}
+			break;
+		}
+		return false;
+	}
+
+	/**
+	 * This method must be called immediately after isValidMove(t, o)
+	 */
+	boolean rochade() {
+		if (white_rochades_small) {
+			setPiece(61, getPiece(63));
+			setPiece(63, new Piece(null, null, EMPTY, 0));
+			return true;
+		}
+
+		if (white_rochades_big) {
+			setPiece(59, getPiece(56));
+			setPiece(56, new Piece(null, null, EMPTY, 0));
+			return true;
+		}
+
+		if (black_rochades_small) {
+			setPiece(5, getPiece(7));
+			setPiece(7, new Piece(null, null, EMPTY, 0));
+			return true;
+		}
+
+		if (black_rochades_big) {
+			setPiece(3, getPiece(0));
+			setPiece(0, new Piece(null, null, EMPTY, 0));
+			return true;
+		}
+
+		return false;
+	}
+
+	/**
+	 * checks, whether color is in check or not.
+	 */
+	public boolean isCheck(String color) {
+		int i;
+		int wking;
+		int bking;
+
+		wking = bking = -1;
+
+		for (i=0;i<64;i++) {
+			if (isWhiteKing(i)) {
+				wking = i;
+			}
+			if (isBlackKing(i)) {
+				bking = i;
+			}
+		}
+
+		// returns 64 false positives
+		if (wking == -1 || bking == -1)
+			return true;
+
+		if (color.equals("white")) {
+			for (i=0;i<64;i++)
+				if (validMove(wking, i)) {
+					return true;
+				}
+
+			return false;
+		}
+
+		if (color.equals("black")) {
+			for (i=0;i<64;i++)
+				if (validMove(bking, i)) {
+					return true;
+				}
+
+			return false;
+		}
+		return false;
+	}
+
+	/**
+	 * simulates a "valid" move or returns false.
+	 * all changes are relative to pieces and will not be painted.
+	 * This method sets internal variables for the rochade() method, which will be overwritten.
+	 */
+	public boolean simulateMove(int t, int o) {
+		if ( !validMove(t, o) ) {
+			return false;
+		}
+
+		push(getPiece(t), t, getPiece(o), o);
+
+		if ( getType(o) == PAWN ) {
+			if(isBlack(o) && t >=56)
+				setPiece(o, new Piece(black_queen));
+
+			if(isWhite(o) && t <=7)
+				setPiece(o, new Piece(white_queen));
+		}
+
+		setPiece(t, new Piece(getPiece(o)));
+		setPiece(o, new Piece(null, null, EMPTY, 0));
+
+		if (isCheck(getColor(t))) {
+			/* restore current position */
+			if(UNDO_DEBUG)
+				print("UNDO", t, o, 0);
+			undo();
+			return false;
+		}
+
+		return true;
+	}
+
+	/**
+	 * performs a "valid" move or returns false.
+	 * all changes are relative to board_pieces and will be painted.
+	 */
+	public boolean doMove(int t, int o) {
+		if ( !validMove(t, o) ) {
+			return false;
+		}
+
+		push(getPiece(t), t, getPiece(o), o);
+
+		if ( getType(o) == PAWN ) {
+			if(isBlack(o) && t >=56)
+				setPiece(o, new Piece(black_queen));
+
+			if(isWhite(o) && t <=7)
+				setPiece(o, new Piece(white_queen));
+		}
+		
+		setPiece(t, new Piece(getPiece(o)));
+		setPiece(o, new Piece(null, null, EMPTY, 0));
+
+		if (rochade())
+			System.out.println("Rochade");
+
+		if (isCheck(getColor(t))) {
+			// restore current positions
+			if(UNDO_DEBUG)
+				print("UNDO", t, o, 0);
+			undo();
+			return false;
+		}
+
+		board_pieces = getPieces();
+		repaint();
+
+		moveNr = stack.size();
+
+		return true;
+	}
+
+	/**
+	 * converts the internal representation into normal chess notation and writes it to stdout
+	 */
+	public void print(String s, int t, int o, int value) {
+		int row1, col1, row2, col2;
+
+		row1 = o/8;
+		col1 = o-(8*row1);
+
+		row2 = t/8;
+		col2 = t-(8*row2);
+
+		System.out.printf("%s: %C%d-%c%d = %3d\n", s,
+				('A')+col1, 8-row1,
+				('A')+col2, 8-row2, value);
+	}
+}
diff --git a/org/homelinux/largo/schach/KIBoard.java b/org/homelinux/largo/schach/KIBoard.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/schach/KIBoard.java
@@ -0,0 +1,209 @@
+/**
+ *   $Id: KIBoard.java 139 2008-04-25 05:02:55Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/schach/KIBoard.java $
+ */
+
+package org.homelinux.largo.schach;
+
+import org.homelinux.largo.games.board.Move;
+import org.homelinux.largo.games.board.chessboard.ChessBoard;
+
+public class KIBoard extends ChessBoard {
+	static final long serialVersionUID = 200208;
+	static final int game_const = 500;
+
+	protected boolean SIMU_DEBUG  = false;
+	private boolean negate_estimation = false;
+
+	private Move bestMove;
+	private int desired_depth;
+
+	public KIBoard(int w, int h) {
+		super(w, h);
+		desired_depth = -1;
+	}
+
+	/**
+	 * Set the current DEBUG-Level:
+	 * simu: print all valid, simulated moves
+	 * undo: print all undos
+	 */
+	public void setDebug(boolean simu, boolean undo) {
+		SIMU_DEBUG = simu;
+		UNDO_DEBUG = undo;
+	}
+
+	public boolean simu_debug() {
+		return SIMU_DEBUG;
+	}
+
+	public boolean undo_debug() {
+		return UNDO_DEBUG;
+	}
+
+	/**
+	 * This function flips the sides: Player A maximizes and Player B minimizes
+	 */
+	public void negateEstimation(boolean b) {
+		negate_estimation = b;
+	}
+
+	/**
+	 * The Minimax-Algorithm works for TWO-PLAYER Games
+	 * Player A minimizes, Player B maximizes
+	 */
+	public int estimateFunction() {
+		int i;
+		int white = 0;
+		int black = 0;
+
+		for(i=0;i<64;i++) {
+			if (isWhite(i))
+				white+=getValue(i);
+			if (isBlack(i))
+				black+=getValue(i);
+		}
+
+		white+=controls("white");
+		black+=controls("black");
+
+		/**
+		 * solves ticket #3
+		 */
+		if ( negate_estimation )
+			return white-black;
+
+		return black-white;
+	}
+
+	/**
+	 * simulates and returns the next possible move for a Player or null, when no more moves are possible.
+	 * The Turn is flipped automatically if "simulate(...)" will find a valid move.
+	 */
+	Move simulate(int t, int o) {
+		Move move = null;
+		int value;
+
+		if ( validTurn(o) ) {
+			while ( t < 64 ) {
+				if (!simulateMove(t, o) ) {
+					t++;
+					continue;
+				}
+
+				value = estimateFunction();
+				if(SIMU_DEBUG)
+					print("SIMU", t, o, value);
+
+				move = new Move(value, t, o);
+
+				/* Flip Sides */
+				setBlacksTurn(!isBlacksTurn());
+				return move;
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * AlphaBeta-Algorithm: the Maximizer
+	 */
+	int max_alpha_beta (int depth, int alpha, int beta) {
+		int moveValue;
+		int o, t;
+		Move move = null;
+
+		if ( desired_depth == -1 )
+			desired_depth = depth;
+
+		for (o = 0; o < 64; o++) {
+			t=0;
+			while ( (move=simulate(t, o)) != null ) {
+				/* particular move from black */
+				t = move.target;
+
+				if ( depth == 0 || Math.abs(move.value) > game_const )
+					moveValue = move.value;
+				else /* best next move */
+					moveValue = min_alpha_beta(depth-1, alpha, beta);
+
+				undo();
+				t++;
+
+				if ( moveValue >= beta )
+					return beta;
+
+				if ( moveValue > alpha ) {
+					alpha = moveValue;
+					if ( depth == desired_depth )
+						bestMove = move;
+				}
+			}
+		}
+
+		return alpha;
+	}
+
+	/**
+	 * AlphaBeta-Algorithm: the Minimizer
+	 */
+	int min_alpha_beta(int depth, int alpha, int beta) {
+		int moveValue;
+		int o, t;
+		Move move = null;
+
+		for (o = 0; o < 64; o++) {
+			t=0;
+			while ( (move=simulate(t, o)) != null ) {
+				/* particular move from white */
+				t = move.target;
+
+				if ( depth == 0 || Math.abs(move.value) > game_const )
+					moveValue = move.value;
+				else /* best next move */
+					moveValue = max_alpha_beta(depth-1, alpha, beta);
+
+				undo();
+				t++;
+
+				if ( moveValue <= alpha )
+					return alpha;
+
+				if ( moveValue < beta )
+					beta = moveValue;
+			}
+		}
+
+		return beta;
+	}
+
+	/**
+	 * Evaluates the next, best Move after search_depth half-moves.
+	 * When the Machine has Black, set negateEstimation(false);
+	 * When the Machine has White, set negateEstimation(true);
+	 */
+	public boolean doBestMove(int search_depth) {
+		int value;
+
+		desired_depth = -1;
+		bestMove = null;
+		value = max_alpha_beta(search_depth, Integer.MIN_VALUE, Integer.MAX_VALUE);
+
+		if ( bestMove == null ) {
+			System.err.println("Computing once more...");
+			value = max_alpha_beta(1, Integer.MIN_VALUE, Integer.MAX_VALUE);
+			if (bestMove == null) {
+				System.out.println("Check Mate");
+				return false;
+			}
+		}
+
+		if (doMove(bestMove.target, bestMove.origin)) {
+			print(getColor(bestMove.target), bestMove.target, bestMove.origin, bestMove.value);
+			return true;
+		}
+
+		print("Check Mate", bestMove.target, bestMove.origin, bestMove.value);
+		return false;
+	}
+}
diff --git a/org/homelinux/largo/schach/Schach.java b/org/homelinux/largo/schach/Schach.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/schach/Schach.java
@@ -0,0 +1,235 @@
+/**
+ *   $Id: Schach.java 143 2008-04-25 12:19:23Z mbroeker $
+ *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/schach/Schach.java $
+ */
+
+package org.homelinux.largo.schach;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JSpinner;
+import javax.swing.SpinnerNumberModel;
+
+import org.homelinux.largo.games.board.MouseListener;
+import org.homelinux.largo.games.board.Point;
+import org.homelinux.largo.utils.BrowserLaunch;
+
+public class Schach extends JFrame implements Runnable {
+	static final long serialVersionUID = 140208;
+	static final String helpURL = "http://largo.homelinux.org/trac/browser/eclipse/Schachspiel/trunk";
+
+	MouseListener listener = null;
+	KIBoard board = null;
+	Point p = null;
+	JLabel    human = new JLabel("<html><font size='5' color='#FFFFFF'>Human</font></html>");
+	JLabel computer = new JLabel("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+	JButton     neu = new JButton("Play");
+	JButton  pconly = new JButton("PC-PC");
+	JButton    back = new JButton("Back");
+	JButton forward = new JButton("For");
+	JButton    help = new JButton("Source");
+
+	SpinnerNumberModel model = new SpinnerNumberModel(4, 1, 8, 1);
+	JSpinner combo = new JSpinner(model);
+
+	JPanel panel;
+	JPanel fpanel;
+
+	int search_depth;
+
+	boolean pc_only;
+
+	public Schach (int w, int h) {
+		super("Chess by Largo Enterprises");
+		setDefaultCloseOperation (javax.swing.JFrame.EXIT_ON_CLOSE);
+		board = new KIBoard(w, h);
+
+		fpanel = new JPanel();
+		fpanel.add(back);
+		fpanel.add(neu);
+		fpanel.add(combo);
+		fpanel.add(pconly);
+		fpanel.add(help);
+		fpanel.add(forward);
+
+		panel = new JPanel();
+		panel.setLayout(new BorderLayout());
+		panel.add(human, "West");
+		panel.add(fpanel, "Center");
+		panel.add(computer, "East");
+
+		fpanel.setBackground(new Color(50, 100, 200));
+		panel.setBackground(new Color(50, 100, 200));
+
+		getContentPane().setLayout(new BorderLayout());
+		getContentPane().add(panel, "North");
+		getContentPane().add(board, "Center");
+
+		neu.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				human.setText("<html><font size='5' color='#FFFFFF'>Human</font></html>");
+				computer.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				pc_only = false;
+				board.init();
+				board.negateEstimation(false);
+			}
+		});
+
+		pconly.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				human.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				computer.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				pc_only = true;
+			}
+		});
+
+		back.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				board.backwards();
+			}
+		});
+
+		forward.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				board.forward();
+			}
+		});
+
+		help.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent actionevent) {
+				BrowserLaunch browser = new BrowserLaunch();
+				browser.openURL(helpURL);
+			}
+		});
+
+		listener = board.getMouseListener();
+
+		pc_only = false;
+		search_depth = 3;
+		pack();
+	}
+
+	public void computer_play () {
+		while (pc_only) {
+			search_depth = model.getNumber().intValue()-1;
+
+			if ( !board.isBlacksTurn() ) {
+				human.setText("<html><font size='5' color='#FF3333'>Computer</font></html>");
+				board.negateEstimation(true);
+				if (!board.doBestMove(search_depth) ) {
+					pc_only = false;
+					return;
+				}
+				board.negateEstimation(false);
+				human.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				board.setBlacksTurn(true);
+			} else {
+				computer.setText("<html><font size='5' color='#FF3333'>Computer</font></html>");
+				if (!board.doBestMove(search_depth) ) {
+					pc_only = false;
+					return;
+				}
+				computer.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				board.setBlacksTurn(false);
+
+				if (board.simu_debug()) {
+					for (int i=0;i<64;i++) {
+						if((i+1)%8 == 0 )
+							System.err.printf("%2d=%d\n", i, board.getValue(i));
+						else
+							System.err.printf("%2d=%d ", i, board.getValue(i));
+					}
+				}
+
+				try {
+					Thread.sleep (10);
+				} catch (InterruptedException e) {
+					System.err.println("computer_play: " + e.getLocalizedMessage());
+					System.err.println("========================================================================");
+					e.printStackTrace();
+					System.err.println("========================================================================");
+					return;
+				}
+			}
+		}
+	}
+
+	public void run () {
+		for (;;) {
+
+			/* is this thread safe */
+			search_depth = model.getNumber().intValue()-1;
+
+			if (pc_only) {
+				computer_play ();
+			}
+
+			if ( !board.isBlacksTurn() ) {
+				if (listener.isSelected ()) {
+					p = listener.getSelection ();
+					if (board.move (p))
+						board.setBlacksTurn(true);
+				}
+				try {
+					Thread.sleep (50);
+				}
+				catch (InterruptedException e) {
+					System.err.println("Schach::run: " + e.getLocalizedMessage());
+					System.err.println("========================================================================");
+					e.printStackTrace();
+					System.err.println("========================================================================");
+					return;
+				}
+			} else {
+				human.setText("<html><font size='5' color='#FFFFFF'>Human</font></html>");
+				computer.setText("<html><font size='5' color='#FF3333'>Computer</font></html>");
+				board.doBestMove(search_depth);
+				human.setText("<html><font size='5' color='#FF3333'>Human</font></html>");
+				computer.setText("<html><font size='5' color='#FFFFFF'>Computer</font></html>");
+				board.setBlacksTurn(false);
+
+				if (board.simu_debug()) {
+					for (int i=0;i<64;i++) {
+						if((i+1)%8 == 0 )
+							System.out.printf("%2d=%d\n", i, board.getValue(i));
+						else
+							System.out.printf("%2d=%d ", i, board.getValue(i));
+					}
+				}
+			}
+		}
+	}
+
+	public static void main (String args[]) {
+		Schach s = new Schach (74, 74);
+
+		s.setResizable(false);
+		s.setVisible (true);
+
+		if (args.length == 1 ) {
+			if ( args[0].equals("full") )
+				s.board.setDebug(true, true);
+			else if ( args[0].equals("simu") )
+				s.board.setDebug(true, false);
+			else if ( args[0].equals("undo") )
+				s.board.setDebug(false, true);
+			else if ( args[0].equals("none") )
+				s.board.setDebug(false, false);
+			else {
+				System.out.println("   Chess: java -jar games.jar [full|simu|undo|none]");
+				System.out.println("Checkers: java -cp games.jar org.homelinux.largo.checkers.Checkers [full|simu|undo|none]");
+			}
+		}
+
+		Thread t = new Thread(s);
+		t.setPriority(Thread.NORM_PRIORITY-1);
+		t.start();
+	}
+}
diff --git a/org/homelinux/largo/utils/BrowserLaunch.java b/org/homelinux/largo/utils/BrowserLaunch.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/utils/BrowserLaunch.java
@@ -0,0 +1,50 @@
+/**
+ *  $Id: BrowserLaunch.java 125 2008-04-22 08:06:08Z mbroeker $
+ * $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/utils/BrowserLaunch.java $
+ */
+
+package org.homelinux.largo.utils;
+
+import java.lang.reflect.Method;
+
+import javax.swing.JOptionPane;
+/**
+ * Cross-Platform Browserlaunch
+ */
+public class BrowserLaunch {
+	private static final String errMsg = "Error attempting to launch web browser";
+
+	/**
+	 * This method opens the URL in a native platform browser
+	 */
+	public void openURL(String url) {
+		String osName = System.getProperty("os.name");
+		try {
+			if (osName.startsWith("Mac OS")) {
+				Class<?> fileMgr = Class.forName("com.apple.eio.FileManager");
+				Method openURL = fileMgr.getDeclaredMethod("openURL",
+						new Class[] { String.class });
+				openURL.invoke(null, new Object[] { url });
+			} else if (osName.startsWith("Windows"))
+				Runtime.getRuntime().exec(
+						"rundll32 url.dll,FileProtocolHandler " + url);
+			else {
+				String[] browsers = { "firefox", "opera", "konqueror",
+						"epiphany", "mozilla", "netscape" };
+				String browser = null;
+				for (int count = 0; count < browsers.length && browser == null; count++)
+					if (Runtime.getRuntime().exec(
+							new String[] { "which", browsers[count] })
+							.waitFor() == 0)
+						browser = browsers[count];
+				if (browser == null)
+					throw new Exception("Could not find web browser");
+				else
+					Runtime.getRuntime().exec(new String[] { browser, url });
+			}
+		} catch (Exception e) {
+			JOptionPane.showMessageDialog(null, errMsg + ":\n"
+					+ e.getLocalizedMessage());
+		}
+	}
+};
diff --git a/org/homelinux/largo/utils/ImgComponent.java b/org/homelinux/largo/utils/ImgComponent.java
new file mode 100644
--- /dev/null
+++ b/org/homelinux/largo/utils/ImgComponent.java
@@ -0,0 +1,31 @@
+package org.homelinux.largo.utils;
+
+import java.awt.Canvas;
+import java.awt.Dimension;
+import java.awt.Image;
+import java.net.URL;
+
+import javax.swing.ImageIcon;
+
+public class ImgComponent extends Canvas {
+	static final long serialVersionUID = 140208;
+	private Image img = null;
+
+	public ImgComponent (String sFile) {
+		ClassLoader cl = getClass ().getClassLoader ();
+		URL url = cl.getResource (sFile);
+		img = new ImageIcon (url).getImage ();
+	}
+
+	public Image getImage () {
+		return img;
+	}
+
+	public Dimension getPreferredSize () {
+		return new Dimension (img.getWidth (this), img.getHeight (this));
+	}
+
+	public Dimension getMinimumSize () {
+		return getPreferredSize ();
+	}
+}
diff --git a/schach.manifest b/schach.manifest
new file mode 100644
--- /dev/null
+++ b/schach.manifest
@@ -0,0 +1,2 @@
+Manifest-Version: 1.0
+Main-Class: org.homelinux.largo.schach.Schach