Diagonal Control Puzzle (Rated 1469): Control Diagonals — Tactical Refutation
This puzzle is a good example of how diagonal control can decide a middlegame. One side’s bishop and queen coordinate to pressure key squares, while the opponent’s queen is forced to defend multiple weaknesses at once. The critical idea is to use a central pawn break to change the geometry of the position and open lines at the right moment. In classical chess, these quiet-looking pawn moves often create the most forcing tactical refutations.