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Subject: Re: How long does it take your program to find Nf6! in this position?

Author: Dann Corbit

Date: 13:24:23 10/23/01

Go up one level in this thread


On October 23, 2001 at 13:12:38, Andrew Williams wrote:

>Hi,
>
>My program lost this game against a crafty clone on ICC recently:
>
>[Event "ICS rated blitz match"]
>[Site "204.178.125.65"]
>[Date "2001.10.21"]
>[Round "-"]
>[White "MoonShot"]
>[Black "PostModernist"]
>[Result "1-0"]
>[WhiteElo "2859"]
>[BlackElo "2772"]
>[TimeControl "600+2"]
>
>1. d4 Nf6 2. c4 c6 3. Nc3 e6 4. e4 Bb4 5. Bd3 d5 6. e5 dxc4 7. Bxc4 Nd5 8.
>Ne2 b6 9. O-O O-O 10. Qd3 Be7 11. Bd2 Bb7 12. Qg3 Kh8 13. Ne4 Ba6 14. Rac1
>Bxc4 15. Rxc4 Qd7 16. Bg5 Na6 17. Bxe7 Nxe7 18. Nd6 Nc7 19. Rfc1 Rad8 20.
>Qf3 Ne8 21. Ne4 Kg8 22. Qh3 a5 23. a4 Nc7 24. Qg4 Kh8 25. Qh5 Kg8 26. R1c3
>Qd5 27. Nf6+ gxf6 28. Rg3+ Kh8 29. Qh6 Ng6 30. Rh3
>{PostModernist resigns} 1-0
>
>
>The move 27.Nf6+ wins everything immediately. MoonShot (crafty 18.12
>on  a K7 1.33GHz) found that in 14 seconds (albeit with hash-tables
>already full). With some fiddling about with null move rules, PM can
>find it in 37 seconds from a "standing start" (K7 1.2GHz). I'd be
>interested to know how other programs do on this.
>
>[D]3r1rk1/2n1nppp/1pp1p3/p2qP2Q/P1RPN3/2R5/1P2NPPP/6K1 w - - bm Nf6

It takes Beowulf a painfully long time (41 seconds) and it does not see the true
value until nearly 50 seconds.

Position 1 - White to play
--------------------------
ID = "Andrew Williams on CCC 10/23/01 @13:12:38, Post 193921"
FEN = 3r1rk1/2n1nppp/1pp1p3/p2qP2Q/P1RPN3/2R5/1P2NPPP/6K1 w - -

. . . r . r k .
. . n . n p p p
. p p . p . . .
p . . q P . . Q
P . R P N . . .
. . R . . . . .
. P . . N P P P
. . . . . . K .

Current Position = 0.59
Number of Possible Moves = 41

  6     27     89     140162   e4g5 h7h6 e2f4 d5d7 g5e4 c7d5
  6     35    107     165142   f2f3 d5d7 h5g5 c7d5 e4f6 d5f6 e5f6
  6     56    123     190602   e4d6 d8d6 c3h3 h7h6 h5g4 d5c4
  7     56    149     228905   e4d6 d8d6 c3h3 h7h6 e5d6 d5c4 d6e7
  7     59    233     347874   f2f3 b6b5 a4b5 d5b5 b2b3 h7h6 e4c5
  8     38    575     895182   f2f3 d5d7 h5g4 g8h8 e4d6 c7d5 c3c1 d7a7
  8     54    663    1018412   e4d6 d8d6 c3h3 h7h6 e5d6 d5c4 d6e7 f8e8
  9     69   1180    1904057   e4d6 d8d6 c3h3 h7h6 e5d6 e7f5 c4c1 d5d6 h3c3
 10     98   4183    7182586   e4f6 g7f6 c3g3 e7g6 g3h3 h7h6 h5h6 f8e8 e5f6 d5g5
h6g5 d8d5
 10   1025   4954    8410507   e4f6 g7f6 c3g3 e7g6 g3h3 h7h6 h5h6 f8e8 e5f6 d5g5
h6g5 d8d5
 11   1054   6405   10867481   e4f6 g7f6 c3g3 e7g6 g3h3 h7h6 h5h6 f8e8 e5f6 d5d4
e2d4 g6f4 h6h7 g8f8 d4e6 c7e6 h7h6 e6g7 f6g7 f8g8




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