Zugzwang is not a combination built from checks and captures. It is almost the opposite: the position would hold if the defender could pass, but chess requires a move, and every legal move gives something away. ## Position 1: one legal move, one lost ending Black to move: ```fen 2k5/2P5/3K4/8/8/8/8/8 b - - 0 1 ``` Black has exactly one legal move, **1...Kb7**. White answers **2.Kd7**, and the c-pawn promotes next. Nothing is hanging and there is no immediate check; the obligation to leave c8 is what loses. Change only the side to move and the result changes. With White to move, **1.Kc6** is stalemate, while any king move that stops guarding c7 lets Black take the pawn. That side-to-move test is the cleanest way to recognize genuine zugzwang. ## Position 2: the trébuchet White to move: ```fen 8/8/8/3pK3/2kp4/8/8/8 w - - 0 1 ``` This four-piece structure is called the **trébuchet**. It is reciprocal zugzwang: whichever side has the move loses. White must move the king away from the defense of d4; Black then takes that pawn and promotes the d-pawn. If the same position has Black to move, Black must abandon d5 instead, and White captures it before advancing. The lesson is not to memorize one square. Notice the geometry: each king attacks the enemy pawn while defending its own, and neither side has a harmless waiting move. ## Position 3: Fischer makes a knight move Fischer–Taimanov, Vancouver 1971, after **85.Bf5**; Black to move: ```fen 8/8/5K2/5BnP/5k2/8/8/8 b - - 0 85 ``` Black's king cannot move without losing the knight. Moving the knight releases White's h-pawn. The game continued **85...Nf3 86.h6 Ng5 87.Kg6**, reaching zugzwang again. After **87...Nf3 88.h7 Ne5+ 89.Kf6**, Black resigned because the pawn cannot be stopped. This is how zugzwang usually appears in a real game: not as a surprise check, but as the final consequence of removing every useful waiting move. ## How to train it When an endgame looks frozen, ask three questions: 1. What would happen if the defender could pass? 2. Which pawn move or spare tempo can be saved for later? 3. Can a king triangulate and return to the same position with the other side to move? Set up the first two positions with both sides to move. Solving that pair is more useful than memorizing a definition because it makes tempo visible on the board.