My vote for a different version would be simply to allow a piece to move back to the square it came from. I think the attacker is always at a disadvantage in closed espionage, particularly the small version and this would eliminate this.
(hide) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)