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# Patrol chess

Patrol chess is a fairy chess form, mainly appearing in fairy chess problems. It was invented by Federik Hendrik von Meyenfeldt, who published in 1975 the first Patrol Chess problem in the Problemist.

## Rule

The rules of orthodox chess are followed, with the following modification.

In order to capture or give check, a piece (including kings) must be `observed' by another piece of the same player. (Note that it is allowed to move a piece to a position where it would give check under standard chess rules, even if it is not observed; however, it only will actually give check when observed.)

Observing means that the piece can move to the square - for pawns, the diagonal capture movement is used; i.e., it is the usual guarding of pieces as in use of common chess.

## Comment

While Patrol chess is mainly used as a problem theme, it is actually also a nice and playable chess variant. As most chess strategies still are valid in Patrol Chess, it is a chess variant for chess players - good chess players probably will also be good in Patrol Chess.

## Problem

Hubert Gockel
Dedicated to Peter Gvozdjak

White to mate in two moves; Patrol chess.

## Solution

This problem contains a try: a move that is `almost' a solution, but fails just because of one black countermove.