[Event "Budapest"] [Site "?"] [Round "0"] [White "Szabo"] [Black "Euwe"] [Result "0-1"] [ECO "C70"] [Opening "Spanish: 4.Ba4"] {The dangerous Kingside pawn majority becomes active} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Re1 Bd7 7. c3 Be7 8. d4 O-O 9. Nbd2 exd4 10. cxd4 Nb4 11. Bxd7 (11. Bb3 {sharper} 11... c5 12. Nf1 Bb5 13. Ng3 d5 14. e5 Ne4 15. Nxe4 dxe4 16. Rxe4 Bd3 17. Re3 c4 18. a3 { lively development (Euwe-Keres, 1939)}) 11... Qxd7 12. Nf1 d5 13. Ne5 $1 { Before committimg himself to the advance of Pe5, White goes in for a maneuver to exchange a pair of Knights and thereby be ready to push the f-pawnaswell} 13... Qe8 14. a3 Nc6 15. Nxc6 Qxc6 16. e5 Ne4 17. Ne3 Qd7 18. f3 {The point of White's previous moves is now apparent; his pawn majority on the Kingside is four against three ... it rolls into action with gain oftempo} 18... Ng5 19. f4 Ne4 20. f5 Rfe8 21. Qf3 {A critical moment. White threatens to win a pawn with Nxd5, and so compels Black's reply. The result is that Black's can't obtain counterplay by means of ... Pc5} 21... c6 (21... -- 22. Nxd5 Qxd5 23. Qxe4) 22. f6 $1 Bf8 (22... gxf6 23. Ng4 {Things would be really serious}) 23. fxg7 Bxg7 24. Nf5 Qe6 25. Be3 Qg6 26. Rad1 $2 {The strongly placed Black Knight makes it difficult for White to attack, but this last move permits Black to get rid of the spearhand of the White position - the e pawn - and suddenly it is Black who stands better. It is essential for White to prevent ... Pf6} (26. Rf1 { necessary}) 26... f6 $1 27. Nh4 Qf7 28. Rf1 Qe6 29. exf6 Bxf6 30. Nf5 Kh8 { In a few moves the whole picture has changed. Through the disappearance of the e-pawn, White is now plagued by the weakness of his isolated d-pawn; moreover, the open g-file will be favourable to Black. This is a familiar circumstance in the struggle for the centre. A central pawn majority lays upon its owner the responsibility of maintaining it. A pawn centre always has associated weaknesses, which remain latent so long as the centre is intact. As soon as it becomes impossible to hold the centre, the drawbacks loomlarger} 31. Qh5 Rg8 32. Rf3 Bg5 33. Rdf1 Raf8 34. Nh6 (34. Nh4 Rxf3 35. Nxf3 Nf6 $19) 34... Bxe3+ 35. Rxe3 Rxf1+ 36. Kxf1 Qf6+ 37. Nf5 Rf8 38. g4 Qxd4 39. Qxh7+ $2 (39. Qh6 Qd1+ 40. Kg2 Qxg4+ 41. Rg3 Qe2+) (39. Rf3 Qd1+ 40. Kg2 Qe2+) 39... Kxh7 40. Rh3+ Kg8 0-1