This game originally goes back to 1992. In 2003 or 2004,
Adrian Millett decided to release the full version as freeware.
Blitz can run in VGA, or in hi-res monochrome CGA mode. Selecting
EGA at the start will give you the same as CGA.
From the Readme:
You will need to be a very good player to beat BLITZ, even on a very
low level of play. Remember that the F5 key enables two-player/set-up
mode, so you can enter the moves of a game to set up a position, or
use the computer as a display for two human players. Note that you can
also change the X-Y size of the boardhave fun with checkers on
a 5×7 board! BLITZ is the ONLY program able to do this.