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 want to find an opponent with similar playing skills to your own look in the Ratings page of the type of game you want and find a player with a similar BKR. (pauloaguia) (show all tips)