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.
Read more about Patrol Chess: Example
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