I have tried your nice chess program, and it plays very well.
I played with version 1.2.3 and it worked flawlessly. Nevertheless, I have tried with version 1.2.4 and it does not work
. It only does a blink, and thats all.
I have an Onyx Boox 60S (without stylus and two years old) with the last firmware version 1.5.1 (20110629).
As reference, Sokoban game also works, but not Checkers.
Can you guess the reason version 1.2.3 works fine and version 1.2.4 no?
Anyway, I have translated the new strings for Spanish language in version 1.2.4, and I attach the file with the new strings added. I expect they can be useful for other users.
Thank you again for your program. As a chess fan, I have found another utility for my boox.