Patrol chess

Example of Patrol chess

	a	b	c	d	e	f	g	h
8									8
7									7
6									6
5									5
4									4
3									3
2									2
1									1
	a	b	c	d	e	f	g	h

1.Nbd8+? Ke4#

Patrol chess is a chess variant in which captures can be made and checks given only if the capturing or checking piece is guarded (or patrolled) by a friendly unit. Non-capturing and non-checking moves are played as normal.

The variant was invented by Frederik Hendrik von Meyenfeldt who published a chess problem using the rules in The Problemist (the magazine of the British Chess Problem Society) in 1975.

Patrol chess has often been used as a condition in chess problems. It is also possible to play complete games under Patrol chess rules.

This article uses algebraic notation to describe chess moves.

Example

The diagram position shows some of the peculiarities of Patrol chess. The white king cannot take the black knight because it is not guarded by a friendly piece. Similarly, the black rook is not giving check, and neither is the white knight on f7. If White were to play Nbd8, however, this would be check, as the knights would patrol one another. Black could reply ...Ke4, with checkmate: the king patrols the rook on e3 giving check and guarding b3 and d3; the rook on a2 is patrolled by the knight on b4 and so controls the squares b2, c2 and d2; Kd4 is not possible because the black king, patrolled by the e3 rook, controls that square; and Kxb4 is not possible because the white king is not patrolled and so cannot capture.

References

Patrol chess by Hans Bodlaender, The Chess Variant Pages
Pritchard, D. B. (1994). The Encyclopedia of Chess Variants. Games & Puzzles Publications. p. 222. ISBN 0-9524142-0-1.

External links

Chess Composition Microweb • Patrol chess problem compositions
Patrol Chess a simple program by Ed Friedlander (Java)

Chess variants (list)

Orthodox rules

Different starting position	Fischer random chess Displacement chess Transcendental chess
Different number of pieces	Dunsany's chess Handicap
Unorthodox board	Balbo's game Circular chess Cylinder chess Double chess Grid chess Hexagonal chess (Cross chess, Masonic chess) Infinite chess Millennium 3D chess Minichess (Los Alamos chess) Rhombic chess Spherical chess Three-dimensional chess Triangular chess

Unorthodox
rules with
traditional
pieces

Standard 8×8 board	Andernach chess Atomic chess Beirut chess Checkless chess Chessplus Circe chess Crazyhouse Cubic chess Dynamo chess Extinction chess Hostage chess Knight relay chess Legan chess Losing chess Madrasi chess Monochromatic chess Patrol chess PlunderChess Portal chess Progressive chess Three-check chess Way of the Knight
Multimove variants	Avalanche chess Kung-Fu Chess Marseillais chess Monster chess Progressive chess
Elements of chance	Dark chess Dice chess Knightmare Chess Kriegspiel Penultima
Unorthodox rules on an unorthodox board	Alice chess Apocalypse Chad Chessence Congo Diplomat chess Dragonfly Jeson Mor Parallel worlds chess Rollerball 5D Chess with Multiverse Time Travel

Unorthodox
rules using
non-traditional
pieces

Standard 8×8 board	Baroque Berolina Chakra Chess with different armies Duell Falcon–hunter chess Grasshopper chess Musketeer chess Pocket mutation chess Cheskers
Compound pieces	Almost chess Capablanca chess Capablanca random chess Chancellor chess Embassy chess Grand Chess Janus Chess Maharajah and the Sepoys Modern chess Seirawan chess Tutti-frutti chess
Unorthodox boards and pieces	Chesquerque Chess on a really big board Courier-Spiel Dragonchess Gess Omega Chess Stratomic Dekle's triangular chess 2000 A.D. Wildebeest chess Wolf chess

Multiplayer

Inspired games

Chess-related
games

Historical	Chadarangam Chaturaji Chaturanga Courier chess Grant Acedrex Shatranj Short assize Tamerlane chess
Regional	Janggi variants Makruk Senterej Shatar Shogi Chu shogi Dai shogi Other variants Sittuyin Xiangqi Jungle Banqi Manchu chess Game of the Three Kingdoms Game of the Three Friends Game of the Seven Kingdoms Other variants

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