Keys "s"=save "l"=load "b"=back once
Ralph Betza's variant. Except on White's first move, you are required to make a second move with a different piece of the same kind, and in the same direction for the same distance. If one move is a capture, the other must be also. King and queen are considered to be of the same kind.
Limited Doublemove Chess
These are simple illustrations rather than strong opponents.
Bug reports? -- Thank you! Keep them coming!