Crazyhouse
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Rules
Crazyhouse is a variant of chess similar to bughouse, except that it is played between only two players, on one board. The special feature of the game is that when you capture a piece, you receive a piece of the same kind, but of your color. Rules for piece 'drops' are the same as in bughouse, i.e. any piece may be dropped on any open square with the expection that pawns may not be dropped on the 1st or 8th rank.
For checkmate to occur, there must be no possibility of avoiding checkmate by a drop interposition. This means either the opponent is not holding any pieces, or in the case of check along the 1st or 8th rank by a queen or rook, he holds no pieces other than pawns. It is also possible to checkmate by contact checks, knight checks, and double checks.
To claim a draw by repetition, the same board position must be reached 3 times with the same player to move. The count restarts whenever a pawn is moved, a capture is made, or a piece is dropped. Note that this may be inadequate for some situations where each player drops a particular piece, which is immediately exchanged, then dropped again etc.
PGN Notation
A special move notation is needed to drop one of your held pieces onto the board. The notation for making a drop is "P@fr", where P is a piece you are holding [PNBRQ] and "fr" is the empty destination square. Example: "n@f5" would drop a knight on square f5.
