--- a/org/homelinux/largo/checkers/Checkers.java
+++ b/org/homelinux/largo/checkers/Checkers.java
@@ -22,7 +22,7 @@
 import org.homelinux.largo.utils.BrowserLaunch;
 
 public class Checkers extends JFrame implements Runnable {
-    static final long serialVersionUID = 250408;
+    static final long serialVersionUID = 1L;
     static final String helpURL = "http://largo.homelinux.org/cgi-bin/gitweb.cgi?p=games/Schach.git;a=summary";
 
     MouseListener listener;

--- a/org/homelinux/largo/checkers/KIBoard.java
+++ b/org/homelinux/largo/checkers/KIBoard.java
@@ -9,7 +9,7 @@
 import org.homelinux.largo.games.board.checkersboard.CheckersBoard;
 
 public class KIBoard extends CheckersBoard {
-    static final long serialVersionUID = 250408;
+    static final long serialVersionUID = 1L;
     static final int game_const = 500;
 
     protected boolean SIMU_DEBUG = false;

--- a/org/homelinux/largo/games/board/Board.java
+++ b/org/homelinux/largo/games/board/Board.java
@@ -14,7 +14,7 @@
 import javax.swing.JPanel;
 
 public class Board extends JPanel {
-    static final long serialVersionUID = 140208;
+    static final long serialVersionUID = 1L;
 
     protected boolean UNDO_DEBUG = false;
 

--- a/org/homelinux/largo/games/board/checkersboard/CheckersBoard.java
+++ b/org/homelinux/largo/games/board/checkersboard/CheckersBoard.java
@@ -13,7 +13,7 @@
 import org.homelinux.largo.utils.ImgComponent;
 
 public class CheckersBoard extends Board {
-    static final long serialVersionUID = 250408;
+    static final long serialVersionUID = 1L;
 
     static final int PIECE = 1;
     static final int QUEEN = 2;

--- a/org/homelinux/largo/games/board/chessboard/ChessBoard.java
+++ b/org/homelinux/largo/games/board/chessboard/ChessBoard.java
@@ -12,7 +12,7 @@
 import org.homelinux.largo.utils.ImgComponent;
 
 public class ChessBoard extends Board {
-    static final long serialVersionUID = 140208;
+    static final long serialVersionUID = 1L;
 
     static final int ROOK = 1;
     static final int KNIGHT = 2;

--- a/org/homelinux/largo/schach/KIBoard.java
+++ b/org/homelinux/largo/schach/KIBoard.java
@@ -9,7 +9,7 @@
 import org.homelinux.largo.games.board.chessboard.ChessBoard;
 
 public class KIBoard extends ChessBoard {
-    static final long serialVersionUID = 200208;
+    static final long serialVersionUID = 1L;
     static final int game_const = 500;
 
     protected boolean SIMU_DEBUG = false;

--- a/org/homelinux/largo/schach/Schach.java
+++ b/org/homelinux/largo/schach/Schach.java
@@ -22,7 +22,7 @@
 import org.homelinux.largo.utils.BrowserLaunch;
 
 public class Schach extends JFrame implements Runnable {
-    static final long serialVersionUID = 140208;
+    static final long serialVersionUID = 1L;
     static final String helpURL = "http://largo.homelinux.org/cgi-bin/gitweb.cgi?p=games/Schach.git;a=summary";
 
     MouseListener listener;

--- a/org/homelinux/largo/utils/ImgComponent.java
+++ b/org/homelinux/largo/utils/ImgComponent.java
@@ -8,7 +8,7 @@
 import javax.swing.ImageIcon;
 
 public class ImgComponent extends Canvas {
-    static final long serialVersionUID = 140208;
+    static final long serialVersionUID = 1L;
     private Image img;
 
     public ImgComponent(String sFile) {