In this position it is worth noting the importance of white’s P on a3. It’s important because it prevents the maneuver ...Nb4-d5, blockading the d-Pawn. It also prepares the development of white’s Q to d3 which in conjunction with the moves Bg5, Rad1 and B-a2-b1 make the launching of a K-side attack possible. Nimzovich recommended the plan with the moves Qe2, Be3, Rfd1 and Rac1, but experience has shown it is of little promise.
11. Re1 b6
11... a6 is generally played but Pachman felt that the text move is more solid because after 12. Bg5 b5 13. Ba2 Bb7 the weakness of the square c5 would make itself felt after 14. Qd3 Nd5 15. Ne4 and now black’s best continuation is Nf6 (15... Bxg5 is less good because after} 16. Nexg5 g6 17. Rac1 Rc8 18. Rc5 {white is slightly better.
13. Bg5 Rc8
Pachman went so far as to give this move a ? stating that black has underestimated the danger that the aggressive posting of white’s pieces presents and black does not have time to develop his own pieces undisturbed. If that sounds harsh, even though Stockfish and Komodo evaluate the position as about equal, statistically after Szabo’s next move white scores a 49 percent winning advantage while losing on 16 percent!
14. Rad1 Qc7
Pachman also gave this move a ? stating that the continuation of the faulty plan started with his previous move could have been mitigated by seeking simplification with 14...Nd4 though even then white woud have the upper hand.
16. h3
Forestalling any complications that may arise from black playing ...Ng4.
16... Rd7
Black’s play is much too slow. His plan is to double Rs on the d-file pressuring white’s d-Pawn, but it’s much too slow and enables white to make a decisive breakthrough.
17. Bh4 Nh5
and even now the advance of the d-Pawn leaves white with a superior position.
17. d5
This is it...the classic lunge!
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