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.