Bughouse Chess

Bughouse / Siamese Chess is played with two teams of two, using two chess sets. Each player in the team plays a different color than their partner.

The game is usually played at a fast time control(blitz). This speed, together with the passing and dropping of pieces, can make the game look chaotic and random to the casual onlooker and hence the name bughouse, which is slang for mental hospital.

A player can pass every enemy piece that he captures to his partner, who is allowed to drop the piece in any of the unoccupied space on the board creating new attacks in the game. It seems that there is some exception with that of pawns as they can be dropped only within the middle 6 rows.

The goal is to checkmate either of your opponents, gaining the win for your team.

Reference -

http://www.chess.com/chessopedia/view/bughouse-chess

http://en.wikipedia.org/wiki/Bughouse_chess