This web page allows you to view the proof that checkers is a draw. Use the interface to play through the analysis and see Chinook's verdicts. To play a move, either:
a) Make a move on the board by clicking on the appropriate piece
and then clicking on the destination square, or
b) Click on the move on the right-hand window pane. Note that
there may be a pause before the move registers.
To undo a move, use the "Back" button at the bottom of the window.
As you play through moves, the right-hand-side window pane displays the proof results. Associated with a move is a result:
| W: | This position is a win. |
| D: | This position is a draw. |
| L: | This position is a loss. |
| D or W: | This position is either a draw or a win (i.e., it has been proven not to be a loss). |
| L or D: | This position is either a draw or a loss (i.e., it has been proven not to be a win). |
| leaf node: | A small search (using the endgame databases) was able to prove the result of this node. |
| not in tree: | The prover did not have to analyze this position. |
| unresolved: | The prover examined this move but did not need to prove the value. Some of the moves from this position may include proven results. |
Trouble Shooting
Java applet will not load
Yahoo! has an excellent help for this.
http://help.yahoo.com/help/au/games/games-09.html
java.lang.ClassFormatError: Bad major version number
at java.lang.ClassLoader.defineClass(ClassLoader.java:250)
You are running an older version of java.
Solution:
For Windows / Linux / Solaris users download and install the Java
Virtual Machine:
http://java.sun.com/getjava/download.html
For Mac OS X you can get information about downloading:
http://www.apple.com/macosx/features/java/
Java applet loads but I only see a gray background