Learn How to Use an Intermezzo: Middlegame Tactics
This middlegame puzzle is about an intermezzo, also called a zwischenzug: a forcing move inserted before the expected recapture or defense. Instead of settling for a routine exchange, White uses a tactical check to keep the initiative and expose the enemy king. The key idea is that forcing moves can change the order of events, making a seemingly strong defensive resource impossible or ineffective. In classical chess, this kind of resource often decides whether an attack is merely active or completely winning.