Sibahi: Ultima? You mean the ''unprogrammable" chess game?
Also, I like the idea of Knightmating Chess. 8x8 board, exchange the knights for kings, exchange the kings on the E file for a knight, and checkmate the knight.
(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)