Learn How to Win with an Intermezzo: Accelerated London
This puzzle comes from the Accelerated London System, where a quiet-looking position suddenly turns tactical because one side’s queen and bishop coordination creates a forcing sequence. The key idea is an intermezzo: instead of recapturing or retreating immediately, the stronger side inserts a forcing check that changes the geometry of the position. In classical chess, these moments often decide the middlegame because king safety, pinned pieces, and loose material all collide at once.