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If all moves that a player can play weakens his position but this player has to play a move because it is his turn , it is called Zugzwang. The player has to make a move and he is obligated to play one of the bad moves .
Samisch - Nimzowitsch
The situation of White is zugzwang. White cannot prevent to lose a piece. a3,a4 and b3 are temporary moves. Even if he plays these moves, he is forced to play one of the moves given below later .
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