P-25 (The rule of the common square)

In more complex pawn endings sometimes it is important to know whether two isolated passed pawns can win without the support of the king. In this situation we are helped out by the rule of the “common square”, formulated by A. Studenecki in 1939. The “common square” is a square the length of the side of the passed pawns. The rule states that if the common square comprises the eight rank, the pawns will win regardless of the support of the king. Since in diagram 25 the common square ends on the seventh rank, the pawns cannot win without the support of the king.

The rule of the common square:

if the common square comprises the eight rank, the pawns will win regardless of the support of the king.

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