Author: William Bryant
Date: 16:31:16 01/08/01
Go up one level in this thread
On January 07, 2001 at 23:08:45, Jon Dart wrote:
>Here is an interesting example of a successful attack by a human
>against a computer:
>
>[Event "?"]
>[Site "?"]
>[Date "2001.01.07"]
>[Round "?"]
>[White "realpravo"]
>[Black "Arasan 6.0"]
>[Result "1-0"]
>[ECO "A08"]
>[WhiteElo "2164"]
>[BlackElo "2561"]
>[TimeControl "300+8"]
>
>1. e4 e6 2. d3 d5 3. Nd2 c5 4. Ngf3 Nc6 5. g3 g6 6. Bg2 Bg7 7. O-O
>Nge7 8. Re1 b6 9. e5 Qc7 10. Qe2 O-O 11. c3 Bb7 12. Nf1 Qb8 13. h4
>Nf5 14. g4 Nh6 15. Bh3 a5 16. Bg5 Kh8 17. Ng3 a4 18. h5 Ng8 19. h6
>Nxh6 20. d4 Ng8 21. Be3 cxd4 22. cxd4 Qc7 23. Kg2 a3 24. b3 Rfc8
>25. Rac1 Ba6 26. Qd2 Qe7 27. Ng5 Qd7 28. f4 Bf8 29. f5 Bb4 30. Qf2
>Bxe1 31. Rxe1 Rc7 32. f6 Nb4 33. Ne2 Nd3 34. Qh4 Nxe1+ 35. Kg3 h6
>36. Ne4 g5 37. Bxg5 Nf3 38. Kxf3 dxe4+ 39. Kg2 Kh7
>40. Bxh6 Nxf6 41. Bg5+ Nh5 1-0 {ArasanX resigns}
>
>The crucial position seems to be at Black's move 40:
>
>r5nk/2rq1p2/bp2pP1p/4P1B1/3Pp1PQ/pP5B/P3N1K1/8 b - -
>
>Here any move but Qb5 leads to a fairly quick mate. Qb5 appears
>to hold, although Black is still worse and may go under
>eventually.
>
>The interesting thing here is that Black is way up material:
>any computer would probably prefer Black in the moves
>leading up to this one.
>
>Arasan takes a long time to find the Qb5 defense, and even longer
>to have the score go negative:
>
>ply 9. Kh7 11 seconds. score: 5.02 2181239 nodes.
>ply 9. Kh7 11 seconds. score: 5.02 2181239 nodes.
>ply 10. Kh7 15 seconds. score: 5.02 3106545 nodes.
>ply 10. Qc6 25 seconds. score: -156.03 6032366 nodes.
>ply 10. Qb5 239 seconds. score: 0.39 70340167 nodes.
>ply 10. Qb5 241 seconds. score: 0.39 70815106 nodes.
>ply 11. Qb5 273 seconds. score: 0.39 77059646 nodes.
>ply 12. Qb5 280 seconds. score: 1.02 78577842 nodes.
>ply 12. Qb5 335 seconds. score: 1.02 89195295 nodes.
>ply 13. Qb5 456 seconds. score: 1.02 112609559 nodes.
>ply 13. Qb5 600 seconds. score: -0.23 141594783 nodes.
>235987 nodes/second.
>28414464 regular nodes, 113180319 quiescence nodes.
>27712078 searches of hash table, 6431604 successful (23 percent).
>500000 hash entries inserted, 1738345 entries replaced, 19925639 inserts failed.
>
>search: Qb5 600 seconds. score: -0.23 141594783 nodes. ++
>correct
>Qb5 Bxh6
Screamer finds this a little faster.
New Board Position
r5nk/2rq1p2/bp2pP1p/4P1B1/3Pp1PQ/pP5B/P3N1K1/8 b - -
Move 1 B>>
The Current Search Time: 180 seconds
Trying Book Move
PLY NODES TIME SCORE PV
______________________________________________________________
5/00 15448 0.337 --
5/00 17060 0.407 -10.51 Rc2 Bxh6 Rxe2+ Kg1 Nxh6 Qxh6+ Kg8
5/01 20091 0.494 -10.61 Bxe2 Bxh6 Bf3+ Kg1 Nxh6 Qxh6+ Kg8
6/00 37185 0.873 --
6/00 135510 3.458 +327.57 Bxe2 Bxh6 Bf3+ Kg3 Kh7 Bg7+ Nh6 Qxh6+
Kg8 Qh8#
6/01 137715 3.524 ++ Qb5
6/01 174497 4.305 -8.90 Qb5 Ng3 Rc2+ Kg1 Rxa2 Bxh6 Bb7
7/00 296230 6.768 --
7/00 369281 8.469 -1.95 Qb5 Bxh6 Qxe2+ Kg1 Qe1+ Qxe1 Nxh6 Qxe4
Rc1+ Kh2
7/05 507878 11.776 ++ Kh7
7/05 595142 13.440 -7.53 Kh7 Bxh6 Nxh6 g5 Kg8 gxh6 Bxe2 h7+ Kh8
Qxe4
8/00 797693 17.731 --
8/00 1061875 24.027 +327.57 Kh7 Bxh6 Nxf6 exf6 Rc5 Bg7+ Rh5 Qxh5+
Kg8 Qh8#
8/01 1075429 24.366 ++ Qb5
8/01 1187114 26.787 -1.59 Qb5 Bxh6 Qxe2+ Kh1 Qe1+ Qxe1 Nxh6 Qe3
Ng8 Qxe4
9/00 2728231 62.050 --
9/00 3831855 86.884 -0.66 Qb5 Bxh6 Qxe2+ Kg1 Qe1+ Qxe1 Nxh6 Qe3
Ng8 Bg2 Rc2 Qh3+ Nh6 Qxh6
10/00 6567933 149.701 --
10/00 8593922 189.547 +1.28 Qb5 Bxh6 Qxe2+ Kg1 Qe1+ Qxe1 Nxh6 Qe3
Nf5 gxf5 Rg8+ Kh1 Rgc8 Qxe4
William
wbryant@ix.netcom.com
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