Underpromote is(would have been) a game played with a standard chess set but single player, or potentially asymetric multiplayer.
You play as the white piece and each move you change which kind of piece you are, you see upcoming pieces in a little preview like tetris. Or it would be if I'd finished, at the moment it's just pawn>rook>knight>bishop>queen>king>repeat.
You get points for taking pieces and clearing boards.
Anyway I suffered a pretty wicked allergic reaction yesterday and this game lacks AI + a couple of other features so this is an unfinished game uploaded for prosperity's sake. Voting is turned off.
also shout out to @clintbellanger for the sweet chess set