Author: Dann Corbit
Date: 13:02:57 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:
>
>[D] 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
Qb5 does NOT help. It's all over but the shouting by this time. The real
mistake is earlier, but I am not sure exactly where.
EPD Kit revision date: 1996.04.21
found computer opening book file [./bookc.bin].
hash table memory = 96M bytes.
pawn hash table memory = 10M bytes.
EGTB cache memory = 32M bytes.
draw score set to 0.00 pawns.
choose from book moves randomly (using weights.)
choose from 5 best moves.
book learning enabled
result learning enabled
position learning enabled
threshold set to 9 pawns.
6 piece tablebase files found
20899kb of RAM used for TB indices and decompression tables
Crafty v17.14
White(1): st 999
search time set to 999.00.
White(1): epdpfga jd0.epd jd0.out
PFGA: EPD record: 1
middle-game phase
clearing hash tables
time surplus 0.00 time limit 16:39 (16:39)
nss depth time score variation (1)
6-> 0.20 7.77 1. ... Qb5 2. Ng3 Rc2+ 3. Kh1 Qd3 4.
Bg2 Qd1+ 5. Kh2 Qxd4
7 0.26 7.77 1. ... Qb5 2. Ng3 Rc2+ 3. Kh1 Qd3 4.
Bg2 Qd1+ 5. Kh2 Qxd4
7-> 0.33 7.77 1. ... Qb5 2. Ng3 Rc2+ 3. Kh1 Qd3 4.
Bg2 Qd1+ 5. Kh2 Qxd4
8 0.58 -- 1. ... Qb5
8 0.76 2.73 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Qxe4
8 0.77 ++ 1. ... Kh7!!
8-> 2.06 3.12 1. ... Kh7
9 2.07 ++ 1. ... Kh7!!
9-> 3.81 3.51 1. ... Kh7
10 4.08 -- 1. ... Kh7
10 4.77 -Mat05 1. ... Kh7 2. Bxh6 Nxf6 3. exf6 Rc5
4. Bg7+ Rh5 5. Qxh5+ Kg8 6. Qh8#
10 7.80 -Mat07 1. ... e3 2. Bxh6 Qd5+ 3. Kg3 Qf3+
4. Kxf3 Bxe2+ 5. Kf4 Kh7 6. Bg7+ Nh6
7. Qxh6+ Kg8 8. Qh8#
10 15.27 ++ 1. ... Qb5!!
10 15.99 0.07 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kh1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Bg2 Nxf6
7. exf6
10-> 21.35 0.07 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kh1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Bg2 Nxf6
7. exf6
11 22.26 -- 1. ... Qb5
11 23.73 ++ 1. ... Qb5!!
11 24.79 -0.89 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kh1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Bg2 Nxf6
7. exf6 Rc2 8. Bxe4
11-> 36.35 -0.89 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kh1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Bg2 Nxf6
7. exf6 Rc2 8. Bxe4
12 39.61 -0.97 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Bg2 Nxf6
7. exf6 Rc2 8. Bxe4
12-> 54.26 -0.97 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Bg2 Nxf6
7. exf6 Rc2 8. Bxe4
13 58.10 -1.20 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Bg2 Nxf6
7. exf6 Kg8 8. Qg5+ Kf8 9. Bxe4
13-> 1:42 -1.20 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Bg2 Nxf6
7. exf6 Kg8 8. Qg5+ Kf8 9. Bxe4
14 1:51 -- 1. ... Qb5
14 2:30 -3.04 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Qg5 Rc1+
7. Qxc1 Rc8 8. Qe1 Nxf6 9. exf6 Rc2
10. Qxe4 Rxa2
14-> 6:28 -3.04 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Qg5 Rc1+
7. Qxc1 Rc8 8. Qe1 Nxf6 9. exf6 Rc2
10. Qxe4 Rxa2
15 6:57 -- 1. ... Qb5
15 8:17 -3.78 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Qg5 Rc1+
7. Qxc1 Bd3 8. Qg5 Nxf6 9. Qxf6+ Kg8
10. Qg5+ Kf8 11. Kf2
15-> 15:23 -3.78 1. ... Qb5 2. Bxh6 Qxe2+ 3. Kg1 Qe1+
4. Qxe1 Nxh6 5. Qe3 Ng8 6. Qg5 Rc1+
7. Qxc1 Bd3 8. Qg5 Nxf6 9. Qxf6+ Kg8
10. Qg5+ Kf8 11. Kf2
time=16:39 cpu=99% mat=7 n=597117655 fh=88% nps=597595
ext-> checks=41024324 recaps=1549543 pawns=2248673 1rep=6191014
thrt:1058890
predicted=0 nodes=597117655 evals=143822902
endgame tablebase-> probes done=0 successful=0
Black(1):
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