[Annotator: Bronstein, David]
A weakness of the dark squares is also a weakness of the pieces and pawns on the light squares. Light-square weaknesses are also possible, resulting in a weakening of the enemy pieces on the dark squares. The point of an attack on the dark squares is that by placing my pawns and pieces on the dark, I attack my opponent’s pieces and pawns on the light. This game provides a clear example of the method of exploiting dark square weakness; and the combination which was possible after Black’s 24th move begs to be included in a textbook, taking place as it does entirely on light squares.
1.c4 Nf6 2.g3 e6 3.Bg2 d5 4.d4 dxc4 5.Qa4+ Nbd7 6.Nf3 a6 7.Qxc4 b5 8.Qc6 Diagram
Having hatched a plan to weaken the enemy dark squares, Szabo undertakes a delicate maneuver aimed at bringing about the exchange of the dark square bishops, which will further strengthen his grip on the dark squares.
8…Rb8 9.Bf4 Nd5 10.Bg5 Be7 11.Bxe7 Qxe7 12.0-0 Bb7 13.Qc2 c5 14.dxc5 Nxc5 15.Rc1 Rc8 16.Nc3 Nf6 Diagram
A small but serious inaccuracy; Black removes this piece from the main theater of operations.[16…Nb6 much better for Black. Increases control of c4 and makes it more difficult for White to play b4.]