[Event "Amsterdam"] [Site "?"] [Round "0"] [White "O'Kelly"] [Black "Donner"] [Result "1-0"] [ECO "A40"] [Opening "Queen's Pawn: 1...e6 2.Nf3"] {Another example of the modern treatment agains the Stonewall} 1. d4 e6 2. Nf3 f5 3. g3 Nf6 4. Bg2 Be7 5. O-O O-O 6. b3 d5 7. Bb2 Qe8 8. Ne5 Nbd7 9. Nd3 Bd6 10. c4 c6 11. Nd2 {The difference between this and the previous example is that White's c-pawn is protected by the b-pawn, and the Queen Bishop stands on b2 rather than the diagonal to h6. At b2 the Bishop has some useful functions; in particular, it makes e5 more difficult for Black} 11... b6 {The advance ... Pe5 would only weaken the d-pawn, so Black develops his Queen Bishop in fianchetto} 12. Rc1 $1 {The right tactics. White's attack must come ultimately on the Queenside and he will therefore need to keep the option of c5.} (12. f3 e5 {Black's d-pawn weakness is offset by that of White's e-pawn}) 12... Ne4 13. Nf3 Bb7 14. Nfe5 Rc8 15. f3 Nef6 16. c5 $1 bxc5 17. Nxc5 Nxc5 18. dxc5 Bc7 19. Qd4 {White's aim is accomplished. He has established a Queenside pawn majority and has blocked - at least for the time being - Black's preponderance in the centre} 19... Ba6 20. Rfe1 Bb5 21. a4 Ba6 22. Bc3 Rb8 23. Rb1 Rb7 24. b4 Bxe5 25. Qxe5 Qe7 26. Qe3 Nd7 $2 {Preparing to push the e-pawn} (26... Bc4) 27. f4 $2 {Deep in his positional plan, White overlooks the win of a piece} (27. b5 cxb5 28. c6) 27... Bc4 28. Bd4 a6 29. Rec1 Rfb8 30. Rxc4 { An exchange sacrifice which puts new life into the Queenside attack} 30... dxc4 31. Qc3 e5 (31... Nf6 32. Bxc6 (32. Qxc4 Nd5 33. Qxa6 Rxb4 34. Rxb4 Rxb4 35. e3 Qb7) (32. Be5 Nd5 $1) (32. Bxf6 $1 Qxf6 33. Qxc4 Rc7 34. e3 Ra8 35. Rd1 { giving White the best winning chances}) 32... Nd5 33. Qxc4 (33. Bxd5 exd5) 33... Rxb4 34. Rxb4 Rxb4) 32. fxe5 Qe6 33. e4 $1 a5 (33... fxe4 34. Bf1 Kh8 35. Bxc4 Qg4 36. Rf1 Rxb4 37. e6 Nf8 38. Qxb4) 34. b5 cxb5 35. exf5 Qxf5 36. Rf1 Qe6 37. Bxb7 Rxb7 38. Qf3 Rb8 39. c6 b4 40. cxd7 Qxd7 41. Bc5 h6 42. Bd6 1-0