Author: Dan Homan
Date: 05:36:37 03/01/99
Go up one level in this thread
On March 01, 1999 at 04:48:28, Will Singleton wrote:
>u2600 Position of the Week
>--------------------------
>
>5R2/8/8/4rp2/3r4/5k2/2B1p2P/2K1R3 w - -
>ArasanX Amateur, 0-1, 1999.02.27, fics
>
>In this position, White played 78. Rg8 and lost. Could your
>program avoid that move within 10 seconds or so? The game might be
>lost in any event (not sure); there is still some play left.
>
On a 400 MHz Celeron, EXchess likes Rg8 with a score of -1.14 through
depth 7. At depth 8 EXchess fails low and switches to Rxf5+ with a
score of -1.33. The time to fail low and choose Rxf4+ is 4 seconds.
5. -0.70 1 43628 1. Rg8 Ra5 2. Kb2 f4 3. h4
6. --
6. -1.14 1 93726 1. Rg8 Kf2 2. Rgg1 Rh4 3. Kd2 Rxh2
6. -1.14 1 125004 1. Rg8 Kf2 2. Rgg1 Rh4 3. Kd2 Rxh2
7. -1.14 2 185789 1. Rg8 Rh4 2. Rg5 Kf2 3. Rgg1 Rxh2 4. Kd2
7. -1.14 3 244658 1. Rg8 Rh4 2. Rg5 Kf2 3. Rgg1 Rxh2 4. Kd2
8. -1.33 4 447298 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+ Kxe2 4. h3 Rf4
5. Bg4+ Kd3 6. Kb2 Ke3
8. -1.33 5 552640 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+ Kxe2 4. h3 Rf4
5. Bg4+ Kd3 6. Kb2 Ke3
9. -1.34 6 611555 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+ Kxe2 4. h3 Rf4
5. Bg4+ Kd3 6. Be6 Rf1+ 7. Kb2 Rf2+ 8. Kb3 Ke3
9. -1.34 9 1038704 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+ Kxe2 4. h3 Rf4
5. Bg4+ Kd3 6. Be6 Rf1+ 7. Kb2 Rf2+ 8. Kb3 Ke3
10. -1.33 10 1167550 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+ Kxe2 4. h3 Rf4
5. Be6 Ke3 6. Kc2 Rf2+ 7. Kc3 Rd2
10. -1.33 18 2168714 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+ Kxe2 4. h3 Rf4
5. Be6 Ke3 6. Kc2 Rf2+ 7. Kc3 Rd2
11. -1.32 20 2428594 1. Rxf5+ Rxf5 2. Bxf5 Kf2 3. Rxe2+ Kxe2 4. h3 Rf4
5. Be6 Rf6 6. Bg4+ Ke3 7. Kc2 Rf2+ 8. Kc3 Rd2
node_count = 3000340 quiescent nodes = 512548 eval_count = 1305326
hash hits = 358146 hash moves = 57361 pawn hash hits = 1286137
node_rate = 117752 null cuts = 438652 exten = 150604 int_iter = 7
- Dan
>Note the wide difference between Amateur and MacChess in their analyses.
>MacChess takes only 3 seconds to discard Rg8, running at over 300k nps.
>Amateur, otoh, takes 43 seconds to realize what's happening (both at ply 9).
>(The follow-on position is also worth a look. Does your prog play 78... Kf2
>quickly?)
>
>Amateur 0.92, Macintosh g3/300 --
>ply score time nodes n/s pv
>
> 2 320 0.01 898 53880
> 3 -64 0.04 1253 18780 Bxf5 Kf2 Rh1 Qe1 Rxe1 Kxe1
> 3 98 0.05 2138 25620 Kb2 Rb4 Bb3 Kf2
> 3 99 0.05 2402 28800 Kb1 Kf2 Rf1
> 3 100 0.05 2561 30720 h3 Kf2 Rf1
> 3 101 0.06 3072 30720 Rxf5 Rxf5
> 4 -88 0.08 4479 33540 Rxf5 Rxf5 Bxf5 Kf2 Rh1 Qe1 Rxe1 Kxe1
> 4 -85 0.10 7788 46680 Bxf5 Rf4 Rxe2 Rxe2
> 4 99 0.18 16876 56220 Kb2 Kf2 Kc3 Rh4
> 5 94 0.25 26428 63420 Kb2 Kf2 Kc3 Rh4 Kd2
> 5 100 0.30 35312 70620 Rg8 Ra5 Rg7 Ra1 Bb1 Rxb1
> 6 93 1.00 82818 82800 Rg8 Kf2 Rg1 Rh4 Rh1 Rxh2
> 7 84 2.46 254747 92040 Rg8 Rh4 Rg1 Rc5
> 8 3 9.42 934686 96300 Rg8 Rh4 Rg1 Rxh2 Rg5
> 9 -210 43.51 4119536 93900 Rg8 Kf2 Rg1 Rc5 h4 Rc4 Rxe2 Kxg1 h5 f4
> 9 -90 173.30 15411507 88800 Kb2 Kf2 Rxf5 Rxf5 Rxe2 Kxe2 Bxf5 Ke3
>Kc3 Rh4 h3 Rh6
> 9 -88 193.53 17222900 88800 Rxf5 Rxf5 Bxf5 Kf2 Rh1 Kg2 Re1 Kf2 Rh1
>Qe1 Rxe1 Kxe1
>
>MacChess 4.0, Macintosh g3/300 --
>02/01|00:00:00| 192| +269| Bxf5 Kf4
>03/01|00:00:00| 3294| -79| Bxf5 Kf2 Rxe2+ Rxe2
>03/04|00:00:00| 4693| -73| h3 Kf2 Rxe2+ Rxe2 Bxf5
>03/11|00:00:00| 6764| +95| Kb2 Rb4+ Kc3 Rbb5
>04/01|00:00:00| 10761| +96| Kb2 Kf2 Kc3 Rdd5
>05/01|00:00:00| 19781| -80| Kb2 Kf2 Rxf5+ Rxf5 Rxe2+ Kxe2 Bxf5
>05/02|00:00:00| 21758| -76| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h3 Kf3
>05/04|00:00:00| 25407| -74| h3 Kf2 Rxe2+ Rxe2 Bxf5 Kg3
>05/11|00:00:00| 32001| -72| Bxf5 Kf2 Rxe2+ Kxe2 h3 Kf3
>05/20|00:00:00| 66502| +87| Rg8 Rc4 Kd2 Rd4+ Kc3 Rdd5
>06/01|00:00:00| 86325| -66| Rg8 Kf2 Rgg1 f4 h3 f3 Rh1
>07/01|00:00:00| 239157| -32| Rg8 Rh4 h3 Kf2 Rgg1 Rxh3 Bb1
>08/01|00:00:02| 667258| -66| Rg8 Kf2 Rgg1 f4 h3 f3 Rh1 Rc4 Kd2
>09/01|00:00:03| 1073439| -188| Rg8 Kf2 Rgg1 Rc5 h4 Rdc4 Kb1 Rxc2 h5
>09/02|00:00:03| 1329074| -84| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h3 Rd1+ Kc2 Rd2+
>Kc1 Ke3 Be4 Rh2
>10/01|00:00:08| 2854279| -85| Rxf5+ Rxf5 Bxf5 Kf2 Rxe2+ Kxe2 h3 Rd1+ Kc2 Rd2+
>Kc1 Ke3 Be4 Rh2 Bf5
>
>
>[Event "fics rated blitz game"]
>[Site "fics, Oklahoma City, OK USA"]
>[Date "1999.02.27"]
>[Time "16:26:32"]
>[Round "-"]
>[White "ArasanX"]
>[Black "Amateur"]
>[WhiteElo "2196"]
>[BlackElo "2127"]
>[TimeControl "300+4"]
>[Mode "ICS"]
>[Result "0-1"]
>
>1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2
>a6 8. O-O-O h6 9. Be3 Bd7 10. f3 b5 11. Nxc6 Bxc6 12. Qf2 Qc7 13. Bd3
>Be7 14. Qg3 g6 15. Qh3 b4 16. Ne2 b3 17. axb3 Qa5 18. Kb1 h5 19. Bd2 Qc5
>20. b4 Qb6 21. g4 Rf8 22. gxh5 Nxh5 23. c4 Ba4 24. Rdg1 Bf6 25. f4 Qb7
>26. Bc3 Bxc3 27. bxc3 Nf6 28. Qe3 Bc6 29. Ng3 Nd7 30. Qd4 Ke7 31. Be2 Qb6
>32. Rd1 Qxd4 33. Rxd4 Rfb8 34. Rhd1 Ba4 35. R1d2 Rb6 36. Ra2 Bc6 37. Kc1
>Rh8 38. Rad2 Ba4 39. Bd1 e5 40. fxe5 dxe5 41. Rd5 Bc6 42. Ra5 Rh4 43. c5
>Rb7 44. Rxa6 Nb8 45. Ra5 Bxe4 46. b5 f5 47. Nxe4 Rxe4 48. c6 Rc7 49. Ra8
>Nxc6 50. Rg8 Nd8 51. Rgxd8 Rxc3+ 52. Bc2 Rb4 53. R2d7+ Kf6 54. Rd6+ Kg5
>55. Rg8 Rxb5 56. Rdxg6+ Kf4 57. Rg3 Rbc5 58. Rg2 e4 59. Rf2+ Rf3 60. Rfg2
>Rfc3 61. Kb2 Rh3 62. Rf2+ Rf3 63. Rfg2 Rh3 64. R8g5 Rb5+ 65. Kc1 Re5 66.
>Rg7 e3 67. Bd1 Rh6 68. Rc7 Re4 69. Be2 Ree6 70. Rc4+ Re4 71. Rc3 Rh4 72.
>Rc8 Rh6 73. Bd3 Rd4 74. Bc2 Re6 75. Rf8 Re5 76. Rg1 e2 77. Re1 Kf3 78.
>Rg8 Kf2 79. Rxe2+ Kxe2 80. Rg5 Rc4 81. Rg2+ Kf1 82. Rd2 Rh4 83. Rd1+ Kg2
>84. Rd2+ Kg1 85. Rd1+ Kxh2 86. Rd2+ Kg3 87. Rd3+ Kf4 88. Rd4+ Kg5 89. Rd2
>f4 90. Rg2+ Rg4 91. Rf2 Rg3 92. Kd2 f3 93. Kd3 Kf4 94. Rf1 f2+ 95. Kc4
>{White resigned} 0-1
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