Keys "s"=save "l"=load "b"=back once
Jens Baek Nielsen, 1994. Once in a game, a player may move the same knight twice. The first of the two moves may leave the player's king in check. The knights may not move until the third move. Even if the side has made its double knight move, a king who is two knight's moves away from an opposing knight is still in check.
These are simple illustrations rather than strong opponents.
Bug reports? -- Thank you! Keep them coming!