Keys "s"=save "l"=load "b"=back once
Vitaliy Korolev, 1991. Both sides move simultaneously. Moves to the same square result in the loss of both units, unless one is the king. You may take your own unit in anticipation of simultaneous enemy capture, at your own risk. I didn't let the king do this. Obviously being checked requires a king move. Thanks to Flavia for help with the debugging.
These are simple illustrations rather than strong opponents.
Bug reports? -- Thank you! Keep them coming!