In chess, zwischenzug (German for "intermediate move") is a common tactic that occurs in almost every game. Zwischenzug is where Player1 threatens Player2, and instead of Player2 countering the direct threat from Player1 (which Player1 expects) Player2 plays a move which poses an even more serious threat to Player1. Player1 must then counter the threat from Player2, which will ideally change the entire situation to Player2´s advantage. Such moves are also called intermezzos.
Borisenkov-Mezenev (diagram, Black to play), continued 1...f2, threatening to queen, which White countered with 2.Rg8, intending 3.Rf8+. But White resigned after the zwischenzug 2...Bb1! which allows Black to queen (3.Kxb1 f1=Q+ or 3.Rf8+ Bf5).
These moves are given in algebraic chess notation.
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