Dating direct links reciprocal
Play continued: This position from a 1988 game between Vitaly Tseshkovsky and Glenn Flear at Wijk aan Zee shows an instance of "zugzwang" where the obligation to move makes the defense more difficult, but it does not mean the loss of the game.
It ended with White resigning in the position in the diagram.
White has a few pawn moves which do not lose material, but eventually he will have to move one of his pieces.
Normally in chess, having tempo is desirable because the player who is to move has the advantage of being able to choose a move that improves their situation.
Zugzwang typically occurs when "the player to move cannot do anything without making an important concession". Kd7 followed by queening the pawn on the next move. Black, on move, must allow White to play Kc5 or Ke5, when White wins one or more pawns and can advance his own pawn toward promotion.
Paul Morphy is credited with composing the position illustrated "while still a young boy". Ra6, Black is in zugzwang and must allow mate on the next move with 1...bxa6 2.b7# or 1... In chess literature, most writers call positions of the second type zugzwang, and the third type reciprocal zugzwang or mutual zugzwang.
Studying positions of reciprocal zugzwang is in the analysis of endgames. The rook cannot leave the first , as that would allow 35... In a position with reciprocal zugzwang, only the player to move is actually in zugzwang.
In the position on the right, White has just gotten his king to a6, where it attacks the black pawn on b6, tying down the black king to defend it. A player will fall into zugzwang if they move their king onto the square and his opponent is able to move onto the corresponding square. R5f3, also trapping the queen, since White cannot play 2. Even if White could pass his move he would still lose, albeit more slowly, after 1... Bxf3 Rxf3, trapping the queen and thus winning queen and bishop for two rooks. In the diagram on the right, if either king moves onto the square marked with the dot of the same color, it falls into zugzwang if the other king moves into the mined square near them. Bxf3 because the bishop is pinned to the king; 1.g4 runs into 1... White's bishop cannot move because that would allow the crushing ... The queen cannot move without abandoning either its defense of the bishop on g5 or of the g2 square, where it is preventing ... Positions with zugzwang occur fairly often in chess endgames. Black exchanges off his , but does not allow White to do the same. According to John Nunn, positions of reciprocal zugzwang are surprisingly important in the analysis of endgames. White now needs to get his bishop to f7 or e8 to attack the pawn on g6.