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Subject: tricky position

Author: Jon Dart

Date: 16:40:55 04/08/03


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



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