Learn How to Use an Intermezzo: Decisive Material Gain
This puzzle comes from the Russian Game, specifically the Stafford Gambit, where Black uses active piece play to punish an overextended kingside. The key idea is an intermezzo: instead of recapturing or simplifying immediately, Black inserts a forcing check that changes the move order and keeps White’s king exposed. That kind of tactical refutation is common in sharp middlegame positions where development and king safety matter more than raw material.