Vugar Gashimov (Black) Puzzle: Trade — Overload

An overloaded defender is a piece charged with protecting more than one critical target. In this position, White’s queen must guard both bishops while Black’s active queen and rook coordinate on the open file. That creates a tactical trade: Black can force the queen to recapture, then use the rook to complete the exchange and emerge with decisive material gain. The lesson applies in both the middlegame and chess endgame whenever heavy pieces attack along a file.