Forcing the opponent to destroy their defense because they are required to make a move.
Why it matters
In an endgame there are few pieces and few safe moves, which is exactly the condition zugzwang needs. Positions that look completely blocked are often won by the player who can still make a spare move when the other cannot.
That makes pawn moves precious. A spare pawn move is a tempo in reserve, and spending one early is the most common way a winning endgame becomes a draw.
See it on a board
Black has one spare pawn move and White has two. Once the h-pawns lock, Black has to move the king, and the white king walks onto a key square.
Checked: the position really has the feature described.
How to play it
- Count the spare pawn moves on both sides before you touch anything.
- Keep your own in reserve and force the opponent to spend theirs.
- When they have none left, take the opposition or the key square, and the position gives way.
At each level
The same idea, said the way it is taught at each age.
Rook · ages 6–9
Count your spare pawn moves before the kings meet. The player who runs out first has to give ground.
Queen · ages 8–11
Spare tempi are a resource like material. Trading a pawn that was your last waiting move can turn a won endgame into a drawn one on the spot.
What goes wrong
- Making pawn moves early because there is nothing else to do, and having none left when they matter.
- Pushing a pawn two squares when one square would have kept a tempo in hand.
Questions people ask
- How do I count spare tempi?
- Count how many pawn moves each side can still make without changing the structure or losing a pawn. The side with more can always hand the move over.