Chess endgames
What Is Zugzwang in Chess?
Zugzwang is a position in which the side to move would be better off passing, because every legal move makes the position worse. Since passing is not allowed in chess, the player has to move and give something up.
Examples
1. Kb5 Kxd4
Each king attacks the enemy pawn and guards its own. Whoever moves first has to stop guarding and loses the pawn. Here White must move, plays Kb5, and Black takes d4 with a winning king and pawn ending.
1... Kf4 2. Kxd5
The same position with Black to move. Now Black is the one who has to let go of the pawn, and White wins it with Kxd5. This is mutual zugzwang: the side to move loses.
How zugzwang works
Most of the time, having the move is an advantage. In zugzwang it is a burden. Every piece that can move would have to leave a key square, drop a pawn, or let the enemy king in.
Zugzwang is most common in endgames, where there are few pieces and few spare moves. With many pieces on the board, there is usually some harmless move available, so true zugzwang in the middlegame is rare.
Mutual zugzwang
In mutual zugzwang, whoever has the move is in trouble. The example on this page, with both kings guarding their own pawns and attacking the other, is a well known case sometimes called the trébuchet. The opposition between two kings is another mutual zugzwang.
When you reach a mutual zugzwang, the whole game can turn on who has the move. That is why spare pawn moves and king maneuvers that lose a tempo, such as triangulation, are so valuable.
How to use zugzwang
When your opponent has only a few useful moves, ask what happens if it were their turn in the current position. If they would have to give something up, look for a way to reach the same position with them to move: a waiting move with a pawn, a king move that loses a tempo, or a rook move that keeps the same control.
On defense, keep spare moves in reserve. Do not push pawns you might later need as waiting moves, and watch for positions where your pieces are tied to squares they cannot leave.
Common questions
What does zugzwang mean?
Zugzwang is a German word meaning compulsion to move. In chess it describes a position where having to move is a disadvantage.
Can stalemate happen from zugzwang?
Stalemate is different. In stalemate the side to move has no legal move at all and the game is a draw. In zugzwang there are legal moves, but each one makes the position worse.
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