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Arno Nickel vs. The World (2008)
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Resilience in Man and Machine

The team of enthusiastic players at chessgames.com again plays a correspondence chess game against talented correspondence GM Arno Nickel.

Once again, thanks to ICGM Arno Nickel for his sportsmanship, the time he spent answering questions after the game, and for his professional efforts in this game:  
 
1. e4 c5 2. Nc3 Nc6 3. Nf3 d6 4. d4 cxd4 5. Nxd4 Nf6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f3 Be7 10. Be3 h5 11. Kb1 Qc7 12. Nxc6 Bxc6 13. Bd3 b5 14. Ne2 Rc8 15. Nd4 Nd7 16. h3 Bb7 17. Bg5 Bxg5 18. Qxg5 Kf8 19. c3 h4 20. Rhe1 Rh6 21. Bc2 Qb6 22. Re2 Nf6 23. Bb3* Qc5 24. Qe3 Re8 25. Red2 Rh5 26. Bc2 g6 27. Qe1 Qc7 28. Ne2 d5 29. exd5 Nxd5 30. Be4 Kg7 31. Qf2 Qe7 32. Nd4 Nf6 33. Bxb7 Qxb7 34. Nc2 Qc7 35. Ne3 Qg3 36. Qg1 Rg5 37. a3 a5 38. Qf1 Re5 39. Rd3 Qf4 40. Re1 Nd5 41. Nxd5 exd5 42. Rxe5 1/2-1/2
 
*Arno Nickel has suggested the improvement 23.Qd2, but after 23. Qd2 a5 24. Qe3** Nd7 25. Nb3 Qc7 26. Bd3 Rh5 27. Red2 Nc5 28. Bc2 d5*** black has stopped any deeper white threats and is heading to a drawn ending.
 
Arno Nickel comments from chessgames:
 
**23.Qd2
I. 23...a5. Here the engines seem to have a hard time to find 24.f4! as the best. Only after 24...b4 25.cxb4 axb4 [JLJ 25...Qxb4 26.Qe3 (a critical position)

NW26Qe3.jpg

Ba6 27.Red2 Bb7 (27...Kg8) 28.a3 Qc5 29.Re2 with unexpected problems for black - possibly 29...Nd7 30.Nb3 (30.Ba4 Nb6 31.Rc2) Qc7 31.Bd3 Nc5 or 29...Kg8 30.Bd3 Nd7 31.Rc2 Qb6 32.Rxc8+ Bxc8 33.Bc2 Bb7 34.Qd2] 26.Nf3 d5 27.e5! Rybka starts to realize that White is doing pretty well. A negative evaluation turns to an increasing postive value.

Neither 27...Ne4 28.Bxe4 (28.Qd4 also looks good) 28...dxe4 29.Ng5, nor 27...Nh5 (which allows different good replies like simply 28.Ree1 or 28.Ng5) lead to equal play.
 
 
*** Rybka 3 : 24-ply
1.   (0.26): 29.Nd4 Qb6 30.e5 b4 31.cxb4 axb4 32.Rc1 Nd7 33.f4 g6 34.Bd1 Rxc1+ 35.Kxc1 Rh8 36.Kb1 Kg7 37.f5 gxf5 38.Qg5+ Kf8 39.Ba4 Nc5 40.Qf6 Rh7 41.Nxf5 Qc7 42.Nd4 Qe7 43.Qxe7+ Kxe7 44.Rc2

2.   (0.23): 29.Nxc5 Qxc5 30.Qf4 Qc7 31.Qg4 g6 32.exd5 Bxd5 33.Be4 Bxe4+ 34.Qxe4 Qc5 35.a3 Qf5 36.Qxf5 Rxf5 37.Rd4 g5 38.Rd7 Rcc5

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