Zugswang

Zugzwang…describes a situation where one player is put at a disadvantage because he has to make a move – the player would prefer to pass and make no move. The fact that the player must make a move means that his position will be significantly weaker than the hypothetical one in which it is his opponent's turn to move.

A player whose turn it is to move who has no move that does not worsen their position is said to be in zugzwang.

In a chess endgame, being in zugzwang usually means going from a drawn position to a loss or a won position to a draw, but it can be from a win to a loss, or a substantial loss of material which probably affects the outcome of the game.Zugzwang

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