Keys "s"=save "l"=load "b"=back once
J Berthoumeau and R Loiseau, 1975. Rooks, bishops, and knights on the far side of the board are sputniks. You may move one, any, or all of them prior to making a regular move. You must follow sputnik moves by one regular move. I programmed this so that giving check ends the sequence, and you must escape from check on your first move. I did not allow a unit that was moved as a spunik to be moved again on that turn.
These are simple illustrations rather than strong opponents.
Bug reports? -- Thank you! Keep them coming!