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Zwischenzug
The zwischenzug (German: "intermediate move") is a chess tactic in which a player, instead of playing the expected move (commonly a recapture of the capturer of a piece that the opponent has just captured) first interposes another move, posing an immediate threat that the opponent must answer, then plays the expected move. Ideally, the zwischenzug changes the situation to the player's advantage, such as by gaining material or avoiding what would otherwise be a strong continuation for the opponent.