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Subject: Re: tricky position

Author: Uri Blass

Date: 22:14:04 04/08/03

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On April 08, 2003 at 19:40:55, Jon Dart wrote:

>From a game Arasan-Pepito:
>
>[D] 8/1B1r1b1k/3N2pp/p3Qp2/3P1P2/7P/1P1b1K2/2r5 w - -
>
>White should play Nxf5, not Nxf7, which loses.
>
>--Jon
>
>
>Crafty 19.2 analysis:
>              clearing hash tables
>              time surplus   0.00  time limit 10:00 (10:00)
>              depth   time  score   variation (1)
>                6->   0.25  -0.94   48. Nxf7 Rxf7 49. Bd5 Rfc7 50. Bb3
>                                    R7c6
>                7     0.28  -0.86   48. Nxf7 Rxf7 49. Bd5 Rfc7 50. Kg2
>                                    R1c2 51. b3
>                7->   0.58  -0.86   48. Nxf7 Rxf7 49. Bd5 Rfc7 50. Kg2
>                                    R1c2 51. b3
>                8     0.69  -0.91   48. Nxf7 Rxf7 49. Bd5 Rg7 50. Kg3 Re1
>                                    51. Qf6 Re2
>                8->   1.30  -0.91   48. Nxf7 Rxf7 49. Bd5 Rg7 50. Kg3 Re1
>                                    51. Qf6 Re2
>                9     1.50  -0.95   48. Nxf7 Rxf7 49. Bd5 Rg7 50. b3 Re1
>                                    51. Qf6 Rge7 52. Kg3
>                9->   3.75  -0.95   48. Nxf7 Rxf7 49. Bd5 Rg7 50. b3 Re1
>                                    51. Qf6 Rge7 52. Kg3
>               10     4.16  -1.05   48. Nxf7 Rxf7 49. Bd5 Rg7 50. b3 Re1
>                                    51. Qf6 Re3 52. Kg2 Rge7
>               10->   8.56  -1.05   48. Nxf7 Rxf7 49. Bd5 Rg7 50. b3 Re1
>                                    51. Qf6 Re3 52. Kg2 Rge7
>               11     9.67  -1.21   48. Nxf7 Rxf7 49. Bd5 Rg7 50. b3 Re1
>                                    51. Qf6 Rge7 52. Kg3 R7e3+ 53. Kh4
>                                    Rd3
>               11->  22.77  -1.21   48. Nxf7 Rxf7 49. Bd5 Rg7 50. b3 Re1
>                                    51. Qf6 Rge7 52. Kg3 R7e3+ 53. Kh4
>                                    Rd3
>               12    24.66  -1.17   48. Nxf7 Rxf7 49. Bd5 Rg7 50. b3 Re1
>                                    51. Qf6 Ree7 52. Kg3 Re3+ 53. Kh2 Re2+
>                                    54. Kg3 Be1+ <HT>
>               12     1:19  -0.92   48. Nxf5 Bc4 49. Be4 Bxf4 50. Qe8 Rf7
>                                    51. d5 Rf1+ 52. Kg2 Rb7 53. Nd4 Rxb2+
>                                    54. Nc2 Kg7 55. Bxg6
>               12->   1:27  -0.92   48. Nxf5 Bc4 49. Be4 Bxf4 50. Qe8 Rf7
>                                    51. d5 Rf1+ 52. Kg2 Rb7 53. Nd4 Rxb2+
>                                    54. Nc2 Kg7 55. Bxg6
>               13     2:28  -0.58   48. Nxf5 Bc4 49. Be4 Rf7 50. Ne3 Rxf4+
>                                    51. Qxf4 Rf1+ 52. Nxf1 Bxf4 53. Ne3
>                                    Bb3 54. Kf3 Bd6 55. h4
>               13->   2:44  -0.58   48. Nxf5 Bc4 49. Be4 Rf7 50. Ne3 Rxf4+
>                                    51. Qxf4 Rf1+ 52. Nxf1 Bxf4 53. Ne3
>                                    Bb3 54. Kf3 Bd6 55. h4
>               14     6:12  -0.32   48. Nxf5 Bc4 49. Be4 Rf7 50. Nd6 Rxf4+
>                                    51. Kg2 Rcf1 52. h4 R1f2+ 53. Kg3 Be1
>                                    54. Nxc4 Rxe4 55. Qxe4 Re2+ 56. Kf4
>                                    Rxe4+ 57. Kxe4
>               14->   7:01  -0.32   48. Nxf5 Bc4 49. Be4 Rf7 50. Nd6 Rxf4+
>                                    51. Kg2 Rcf1 52. h4 R1f2+ 53. Kg3 Be1
>                                    54. Nxc4 Rxe4 55. Qxe4 Re2+ 56. Kf4
>                                    Rxe4+ 57. Kxe4
>              time=10:00  cpu=99%  mat=-1  n=441601337  fh=91%  nps=735k
>              ext-> chk=26474119 cap=419573 pp=99759 1rep=2307840 mate=117875
>              predicted=0  nodes=441601337  evals=234452399
>              endgame tablebase-> probes done=0  successful=0
>              SMP->  split=0  stop=0  data=0/32  cpu=9:59  elap=10:00

Movei on p850 needs less than a minute to find Nxf5

depth=10 -0.81 d6f5
Nodes: 8550533 NPS: 177507
Time: 00:00:48.17
depth=10 -0.69 d6f5 f7c4 b7f3 c1c2 f2g1 c2b2 f5d6 d2c3 f4f5 b2b1 g1h2 b1b2 f3g2
Nodes: 10494462 NPS: 175757
Time: 00:00:59.71
depth=10 -0.69 d6f5 f7c4 b7f3 c1c2 f2g1 c2b2 f5d6 d2c3 f4f5 b2b1 g1h2 b1b2 f3g2
Nodes: 15028892 NPS: 174490
Time: 00:01:26.13
depth=11 -0.64 d6f5 f7c4 b7f3 c1f1 f2g2 f1e1 e5c5 c4f1 g2g3 d7f7 f5d6 d2f4 g3f2
f4d6 c5d6
Nodes: 19911896 NPS: 173116
Time: 00:01:55.02
depth=11 -0.64 d6f5 f7c4 b7f3 c1f1 f2g2 f1e1 e5c5 c4f1 g2g3 d7f7 f5d6 d2f4 g3f2
f4d6 c5d6
Nodes: 27427327 NPS: 174474
Time: 00:02:37.20
depth=12 -0.52 d6f5 f7c4 b7e4 d2f4 e5e8 d7f7 d4d5 f7b7 f5e3 f4e3 f2e3 c1g1 e8c6
g1g3 e3d4
Nodes: 56809315 NPS: 173920
Time: 00:05:26.64

Uri



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