playBunny: Thanks! I tried to trick BK by typing the double-move into the URL, but it did not execute the move, so it is explicitly checking the intermediate positions for legality. As that situation would be quite rare, maybe even most real-live players have never encountered it and wouldn't know the rule exactly. I guess it was inconvenient, but it will not make me lose the game. I just found it interesting.
(hide) If you don't want other users to know what you are doing you can change into cloak mode in Settings (paying members only). (pauloaguia) (show all tips)