Author: Martin Giepmans
Date: 14:16:25 09/11/04
Go up one level in this thread
On September 11, 2004 at 13:24:48, Kurt Utzinger wrote:
>A further example of our running AT 2004 (90m+30s) tournament
>look at [http://www.utzingerk.com/at_2004.htm] where Black
>(SmarThink 0.17a) made a losing move in round 2.5
>
>Aristarch 4.50 vs SmarThink 0.17.a
>To avoid move 14...Nf4?
>[D]rn2k2r/pb3pb1/2p1p2p/1p5n/2pPP1Nq/P1N5/1P2BPPB/R2QK2R b KQkq - 0 14
>
>
>[Event "AT 2004 Ath 1.3/64 90m+30s"]
>[Site "Zurich"]
>[Date "2004.08.01"]
>[Round "2.5"]
>[White "Aristarch 4.50"]
>[Black "SmarThink 0.17a"]
>[Result "1-0"]
>[ECO "D43"]
>[Annotator "Utzinger,K"]
>[PlyCount "89"]
>
>1. d4 c6 2. c4 d5 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 h6 6. Bh4 dxc4 7. e4 g5 8. Bg3 b5
>9. Be2 Bb7 {Both last book move; Beide letzter Buchzug} 10. a3 Bg7 11. h4 g4
>12. Ne5 Nh5 13. Bh2 Qxh4 14. Nxg4 Nf4 {Which programs do avoid this losing
>move; Welche Programme vermeiden diesen Verlustzug} 15. g3 {
>Winning a piece; Gewinnt eine Figur} 15... Ng2+ 16. Kf1 Qh3 17. Kg1 {Black's kn
>ight can no longer escape and will go lost after Bf1; Der schwarze Springer
>ist gefangen und wird nach Lf1 verloren gehen} 17... h5 18. Ne5 f6 19. Nf3 Nd7
>20. Bf1 Qg4 21. Bxg2 O-O-O 22. Nh4 Bf8 23. Qf1 Kb8 24. Bh3 Qg8 25. a4 b4 26.
>Ne2 Bh6 27. Qe1 a5 28. Qd1 c5 29. Qc2 Nb6 30. Rd1 Qh7 31. Bg2 b3 32. Qc3 Nxa4
>33. Qxa5 Nxb2 34. Ra1 Nd3 35. d5 Kc8 36. Qb5 exd5 37. Bh3+ Kb8 38. Qb6 b2 39.
>Ra2 b1=Q+ 40. Qxb1 d4 41. Qb6 Rde8 42. Bf5 Qg7 43. Ra5 Rc8 44. Qa7+ Kc7 45. Rb5
>1-0
SpiderChess never considers Nf4.
Probably because of some code that detects trapped pieces (Ng2 in this case).
It looks like Nd7 is another move to be avoided. The score for that move
suddenly drops at depth 15 (score from blacks viewpoint):
........
12 0:00:14 - 0.28 B8-D7 E4-E5 G7-F8 G2-G3 H4-E7 C3-E4 E8-C8 E4-D6 C8-C7
13 0:00:36 - 0.31 B8-D7 G4-E3 H5-F6 E2-F3 F6-H7 A3-A4 A7-A6 A4xB5 A6xB5
14 0:01:46 - 0.32 B8-D7 E1-G1 E8-C8 B2-B3 D7-C5 G4-E5 C5xB3 E2xH5 B3xA1
15 0:05:18 - 1.36 B8-D7 G4-E3 H5-F6 G2-G3 H4-G5 E4-E5 C6-C5 E5xF6 B7xH1
0:06:23 - 0.74 B8-A6 G4-E3 H5-F6 G2-G3 H4-G5 E4-E5 F6-D5 C3-E4 D5xE3
Martin
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