Microchess

Microchess, like Checkers, was one of the very first games for the Coco 1 that Radio Shack released. It also featured 8 skill levels, 2 different color sets, either joystick or keyboard for the controls, and only required 4K to run. While the cartridge is labelled as version 2.0, I believe it was cross-platform, and that versions prior to 2.0 only appeared on non-Coco platforms.