ChessRanger
Endgame

Reserve tempo

A spare pawn move held back to lose a move at will and put the opponent in zugzwang.

A reserve (or spare) tempo is a pawn move you keep in hand so that, in a mutual-zugzwang position, you can 'pass' — make a waiting move — and force the opponent to move into a losing setup. In king-and-pawn endings, having one more available pawn tempo than the opponent often decides the game.

The technique is to hoard your spare pawn moves and not waste them early: reach the critical position with a tempo still in reserve, play it, and hand the obligation to move over to your opponent.

Why it matters

In zugzwang-based endings the side with the last spare tempo wins — counting and preserving reserve tempi is decisive, exact endgame technique.

The mistake everyone makes

Burning your spare pawn moves too early, so when the mutual-zugzwang position arrives it's you, not the opponent, who must move and lose.

Related terms

Zugzwang
A position where every legal move worsens your position — but passing is not allowed, so you must move.
Triangulation
Losing a tempo with the king (taking three moves to reach a square two allow) to put the opponent in zugzwang.
Waiting move
A move that improves nothing but passes the turn, forcing the opponent to commit first.
Reciprocal zugzwang
A position that is zugzwang for whoever is to move — the losing spot changes hands with the move.

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