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In a position with reciprocal zugzwang, only the player to move is actually in zugzwang. 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. Some writers call the second type a squeeze and the third type zugzwang. 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.
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.
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