Gaia released a chess game for the Commodore Plus/4. The game Shack is a conversion of a chess program from the Commodore 64. It has adjustable difficulty setting (1-9), load/save option and a undo function. The game can be played on a PAL or NTSC machine with 64 kBytes.
Download: shack.prg
Website: http://plus4world.powweb.com