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Pocket mutation chess

Chess variant

Field	Value
name	Pocket mutation chess
designer	Mike Nelson
genre	Chess variant
players	2
skills	Strategy, tactics

Pocket mutation chess is a chess variant invented by Mike Nelson in 2003.

In this game, a player can take a piece from the board and put it into a pocket. The piece in the pocket can be put back on the board later. When placing the piece into the pocket the player can mutate the piece, i.e. change it to a different piece.

The game was one of the Recognized Chess Variants at The Chess Variant Pages before the program was discontinued.

Rules

The starting position in this game is the same as in standard chess and players make moves as in standard chess. Instead of moving, a player can take one of their own pieces from the board and put it into the pocket, provided that the pocket is empty. If the piece is placed into the pocket from the last rank, it gets promoted to a piece of higher class. Otherwise the player has an option to mutate the piece into a different piece of the same class. The choice of mutating (or not) must be made at the time the piece is removed. White cannot use the pocket on the first move. The king cannot be placed into the pocket.

As a players move, a piece in the pocket can be dropped on any empty position on the board, except the last rank. A pawn can make only a single step from the first rank, but can do a double step from the second one, even if dropped there or moved from the first rank. The en passant rule applies as in standard chess. Pawns that reach the last rank do not get promoted immediately. Instead, they can be placed into the pocket and promoted to a piece of higher class.

There is no castling in this chess variant. The game is declared a draw if no capture or promotion was made for 50 consecutive moves.

Classes of the pieces

Besides usual pieces there are several fairy chess pieces in this game. All pieces are divided into the following classes. All pieces from the same class are of presumably the same (or close) value.

Class	Usual pieces	Combined with knight	Combined with nightrider	Combined with king	Combined with nightrider and king
1	[[File:Chess plt45.svg	25px]] pawn
2	[[File:Chess blt45.svg	25px]] bishop	[[File:Chess nlt45.svg	25px]] knight
3	[[File:Chess rlt45.svg	25px]] rook		[[File:Chess Nlt45.svg	25px]] nightrider	super bishop (bishop+king)
4		[[File:Chess alt45.svg	25px]] cardinal (bishop+knight)		super rook (rook+king)
5	[[File:Chess qlt45.svg	25px]] queen	[[File:Chess clt45.svg	25px]] chancellor (rook+knight)	cardinal rider (bishop+nightrider)	super cardinal (bishop+knight+king)
6			chancellor rider (rook+nightrider)	super chancellor (rook+knight+king)	super cardinal rider (bishop+nightrider+king)
7		[[File:Chess Alt45.svg	25px]] amazon (queen+knight)			super chancellor rider (rook+nightrider+king)
8			amazon rider (queen+nightrider)

| tright | | | | | |xx| | | | | | | | | | | | | | |xx| | | | | | | | | | | |xx |xx| |xx| | |xx| | | | | |xx| | | | | |Nl| | | | | | | | | |xx| | | | | Nightrider makes any number of knight moves in the same direction.

References

Pritchard, D. B.. (2007). "The Classified Encyclopedia of Chess Variants". John Beasley.
[http://www.chessvariants.com/rindex.html The Chess Variant Pages: Recognized Chess Variants]

Info: Wikipedia Source

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