Author: Christophe Theron
Date: 15:27:35 10/19/03
Go up one level in this thread
On October 19, 2003 at 16:40:19, Eelco de Groot wrote:
>On October 19, 2003 at 15:27:49, Ernst Walet wrote:
>
>>On October 19, 2003 at 15:15:37, Theo van der Storm wrote:
>>
>>>Dutch games link(nt) http://www.computerschaak.nl/pgn_base/docc03.pgn
>>
>>As far as I recall, in the game Diep-Rebel, the last move in the PGN was not
>>played. Rebel played a2, completely missing the obvious, and Jeroen offered
>>draw right away.
>>
>>Ernst.
>[Event "23rd DOCC"]
>[Site "Leiden NED"]
>[Date "19/10/2003"]
>[Round "06"]
>[White "Rebel"]
>[Black "Diep"]
>[Result "1/2-1/2"]
>
>1. d4 d5 2. c4 Nc6 3. Nc3 dxc4 4. d5 Ne5 5. Qd4 Ng6 6. e4 e5 7. Qxc4 Bd6 8. Qa4+
>Bd7 9. Bb5
>Nf6 10. Nf3 O-O 11. Bxd7 Qxd7 12. Qxd7 Nxd7 13. Be3 Nf4 14. Bxf4 exf4 15. Nd4
>Be5 16. O-O-O
>Rae8 17. Rhe1 a6 18. Kc2 g6 19. Nce2 Re7 20. f3 Rfe8 21. Rg1 Bd6 22. Rgf1 h5 23.
>Nc1 f5
>24. exf5 Nb6 25. Ne6 gxf5 26. Kb1 Nc4 27. Rh1 Ne3 28. Rd2 c6 29. Nd3 Nxd5 30.
>Nec5 b6
>31. Na4 Re2 32. Kc1 Kh7 33. Rhd1 R2e6 34. Kb1 Bf8 35. Rg1 Bg7 36. Rgd1 a5 37.
>Kc1 Bd4
>38. Kb1 c5 39. Nc1 Ne3 40. Rh1 b5 41. Nc3 Nc4 42. Rc2 Bxc3 43. Rxc3 Rg6 44. Rg1
>Nd2+ 45. Kc2
>b4 46. Rd3 Nc4 47. Rd7+ Kh6 48. Kb3 Nb6 49. Rc7 c4+ 50. Kc2 Nd5 51. Rc5 Ne3+ 52.
>Kb1 a4
>53. Ne2 Rxg2 54. Rc6+ Kg5 55. Rh1 h4 56. Nd4 a3 57. bxa3 bxa3 58. Ne6+ Rxe6 59.
>Rxe6
>Nd5 60. Re8 Rb2+ 61. Kc1 Nb4 62. Rg1+ Kf6 63. Rgg8 Nxa2+ 64. Kd1 Nc3+ 65. Ke1 a2
>66. Rgf8+ 1/2-1/2
>
>Ouch! I think that is one for the chesscolumns, Ernst! Tien punten voor de
>blunderubriek! From your story, I take it that Diep played 65...a2?? here
>
>[D]4R1R1/8/5k2/5p2/2p2p1p/p1n2P2/1r5P/4K3 b - - 3 1
>
>Rebel would also have played that...
>
>00:00:01.2 3,24 1 5 Rxh2
>00:00:01.2 3,71 1 8 a2
>00:00:01.2 3,72 1 21 Nd5
>00:00:01.3 2,56 2 171 Nd5 Ra8
>00:00:01.3 3,66 2 644 a2 Rgf8+ Kg6 Rg8+ Kf7
>00:00:01.4 3,66 3 1694 a2 Rgf8+ Kg6 Rg8+ Kf7
>00:00:01.6 3,66 4 4669 a2 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+
>00:00:01.7 3,66 5 11164 a2 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+
>00:00:01.9 3,66 6 27649 a2 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+
>00:00:02.5 3,66 7 101036 a2 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+
>00:00:04.3 3,66 8 326846 a2 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+ Kg6 Rg8+ Kf7 Rgf8+
>00:00:11.1 3,51 9 1801567 a2 Rgf8+ Kg6 Rg8+ Kf7 Ref8+ Ke6 Ra8
>00:00:51.4 3,66 10 10858785 a2 Rgf8+ Kg7 Rg8+ Kf7 Rgf8+ Kg6 Ra8
>00:02:21.3 3,66 11 31260296 a2 Rgf8+ Kg7 Rg8+ Kf7 Rgf8+ Kg7 Rg8+ Kf7 Rgf8+
This analysis is very strange. The line is obviously a quick draw by threefold
repetition. Rebel is usually very good at seeing very long check-check lines and
should have seen that a2 is an almost immediate draw.
After a2, Chess Tiger sees the draw after a 5 plies search (that is to say
instantly).
I have not tried with other chess programs but I am pretty sure that they all
see very quickly that a2 is just a draw...
Christophe
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