Learn How to Use an Intermezzo: Decisive Material Gain
This puzzle comes from the Queen's Gambit Declined and shows a classic middlegame tactical refutation. The key idea is an intermezzo: instead of recapturing or reacting passively, White uses a forcing check to exploit loose pieces and the exposed black queen. In positions like this, material balance can hide tactical vulnerability. A single active move can turn a seemingly messy position into a decisive gain by winning the queen or forcing a favorable simplification.