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Subject: Re: Comet/Crafty-interesting game, irritating sacrifice

Author: José Antônio Fabiano Mendes

Date: 13:23:15 04/11/00

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On April 11, 2000 at 01:09:43, Pete Galati wrote:

>On April 11, 2000 at 00:33:24, Dann Corbit wrote:
>
>>On April 11, 2000 at 00:01:21, Pete Galati wrote:
>>
>>>This is a game from a quick match between the new Comet and Crafty.  My time
>>>controls I guess were a little bit fast 40 moves/10 minutes, and this is my slow
>>>computer, but Comet made a sacrifice I did'nt understand on the position below,
>>>99. RxP QxR, Shouldn't have Comet played 99. R-R1 instead? Other than that some
>>>great jockeying for position, and Comet makes what looks to me like some brave
>>>moves, but lost the game.
>>>
>>>"Craftyob" indicates that it's Crafty using the book downloaded at Bob's ftp.
>>>
>>>[Event "Computer chess game"]
>>>[Site "DEFAULT"]
>>>[Date "2000.04.10"]
>>>[Round "2"]
>>>[White "Comet"]
>>>[Black "Craftyob"]
>>>[Result "0-1"]
>>>[TimeControl "40/600"]
>>>
>>>1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7
>>>8. e3 d6 9. f3 Nbd7 10. Bd3 c5 11. Ne2 Rc8 12. Qb3 h6 13. Bh4 cxd4 14. exd4
>>>d5 15. O-O dxc4 16. Bxc4 Nb8 17. Rfc1 Nc6 18. Qd3 e5 19. d5 Na5 20. Ba2 g5
>>>21. Bg3 Qd6 22. Nd4 Bxd5 23. Nf5 Qe6 24. Nxh6+ Kg7 25. Bxd5 Nxd5 26. Nf5+
>>>Kh8 27. b4 Nc6 28. b5 Nce7 29. Nxe7 Nxe7 30. Rd1 Nf5 31. Bf2 Rfd8 32. Qxd8+
>>>Rxd8 33. Rxd8+ Kg7 34. a4 Kf6 35. Re1 Qc4 36. Re4 Qc1+ 37. Be1 Qc5+ 38. Kh1
>>>Qc1 39. Rd3 Ke6 40. Rc3 Qd1 41. Rc6+ Nd6 42. Re3 f5 43. a5 f4 44. Re4 bxa5
>>>45. h3 Qb1 46. Re2 Qxb5 47. Rcc2 a4 48. Kh2 a3 49. Bf2 a5 50. Ba7 Kf6 51.
>>>Ra2 Nc4 52. Bf2 Qb3 53. Bc5 a4 54. Rf2 Qc3 55. Rfc2 Qb3 56. Rf2 Ke6 57. Bf8
>>>Qe3 58. Rfc2 Qb3 59. Rf2 Qd3 60. Bc5 Qc3 61. Rac2 Qb3 62. Ra2 Qd3 63. Rfc2
>>>Qb3 64. Rf2 Qd3 65. Rfc2 Ne3 66. Rc1 Qd5 67. Re2 Nf1+ 68. Rxf1 Qxc5 69. Ra1
>>>Qb4 70. Rea2 e4 71. fxe4 Qxe4 72. Rxa3 Qe5 73. Kh1 Qh8 74. Rxa4 Kf5 75. Ra8
>>>Qh4 76. Kg1 Kg6 77. R1a6+ Kf5 78. Rf8+ Ke5 79. Re8+ Kf5 80. Ra5+ Kf6 81.
>>>Rb5 g4 82. Rf8+ Ke6 83. Rxf4 Qe1+ 84. Rf1 Qc3 85. h4 g3 86. Rh5 Qd3 87.
>>>Rh6+ Ke5 88. Rh8 Ke6 89. Re1+ Kf7 90. Rh5 Qd4+ 91. Kh1 Qf4 92. Ra1 Kg6 93.
>>>Rg5+ Kf7 94. Ra7+ Kf6 95. Ra6+ Ke7 96. Ra7+ Kd6 97. Ra6+ Kc7 98. Rg7+ Kb8
>>>99. Rxg3 Qxg3 100. Rh6 Kc7 101. Rh7+ Kd6 102. Kg1 Qe1+ 103. Kh2 Qe5+ 104.
>>>g3 Qe2+ 105. Kh3 Qf1+ 106. Kg4 Qd1+ 107. Kg5 Qd5+ 108. Kh6 Qe6+ 109. Kh5
>>>Qe5+ 110. Kh6 Qxg3 111. h5 Qe3+ 112. Kg6 Qe6+ 113. Kg5 Ke5 114. Rc7 Qf6+
>>>115. Kg4 Qf4+ 116. Kh3 Qf3+ 117. Kh4 Kf6 118. Ra7 Qf2+ 119. Kg4 Qxa7 120.
>>>h6 Qe3 121. h7 Kg7 122. h8=Q+ Kxh8 123. Kh4 Kg7 124. Kh5 Qg1 125. Kh4 Kf6
>>>126. Kh3 Kf5 127. Kh4 Qh2#
>>>{Black mates} 0-1
>>>
>>>[D]1k6/6R1/R7/8/5q1P/6p1/6P1/7K w - - 0 99
>>>
>>>99. RxP?
>>Probably your best move at that point.  Crafty would have done the same thing,
>>if the tables were turned:
>>White(1): epdpfga epd.epd epd.out
>>PFGA: EPD record: 1
>>end-game phase
>>              clearing hash tables
>>              time surplus   0.00  time limit 16:39 (16:39)
>>         nss  depth   time  score   variation (1)
>>                2     0.00 -Mat01   1. h5 Qc1#
>>                2     0.00     ++   1. Ra8+!!
>>                8     0.70  -1.11   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Re4 Qd3
>>                                    4. Re6 Qg3
>>                8->   0.95  -1.11   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Re4 Qd3
>>                                    4. Re6 Qg3
>>                9     1.30  -1.07   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Re4 Qd3
>>                                    4. Re8 Kd7 5. Re5
>>                9->   1.69  -1.07   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Re4 Qd3
>>                                    4. Re8 Kd7 5. Re5
>>               10     3.12     --   1. Rxg3
>>               10     5.56  -1.44   1. Rxg3 Qxg3 2. Rb6+ Kc7 3. Rh6 Qf2
>>                                    4. Rh7+ Kd6 5. h5 Qf5 6. Rh6+ Ke5 7.
>>                                    Kh2
>>               10->   6.65  -1.44   1. Rxg3 Qxg3 2. Rb6+ Kc7 3. Rh6 Qf2
>>                                    4. Rh7+ Kd6 5. h5 Qf5 6. Rh6+ Ke5 7.
>>                                    Kh2
>>               11    13.41  -1.52   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Kg1 Kd6
>>                                    4. Re4 Kd5 5. Ra4 Qe3+ 6. Kh2 Ke5
>>               11->  15.46  -1.52   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Kg1 Kd6
>>                                    4. Re4 Kd5 5. Ra4 Qe3+ 6. Kh2 Ke5
>>               12    19.51  -1.51   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Kg1 Kd6
>>                                    4. Re4 Kd5 5. Ra4 Ke5 6. Ra5+ Kf4 7.
>>                                    h5
>>               12->  24.69  -1.51   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Kg1 Kd6
>>                                    4. Re4 Kd5 5. Ra4 Ke5 6. Ra5+ Kf4 7.
>>                                    h5
>>               13    37.21  -1.51   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Kg1 Kd6
>>                                    4. Kh1 Ke6 5. Rc4 Kf6 6. Kg1 Kg6 7.
>>                                    Re4
>>               13->  49.66  -1.51   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Kg1 Kd6
>>                                    4. Kh1 Ke6 5. Rc4 Kf6 6. Kg1 Kg6 7.
>>                                    Re4
>>               14     1:17  -1.54   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Kg1 Kd6
>>                                    4. Kh1 Ke6 5. Kg1 Kf6 6. Ra6+ Kf7 7.
>>                                    Ra4 Qe3+ 8. Kh2 Kf6
>>               14->   1:53  -1.54   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Kg1 Kd6
>>                                    4. Kh1 Ke6 5. Kg1 Kf6 6. Ra6+ Kf7 7.
>>                                    Ra4 Qe3+ 8. Kh2 Kf6
>>               15     4:09  -1.61   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Ra7+ Kb6
>>                                    4. Ra4 Kc5 5. Kg1 Kc6 6. Kh1 Kd5 7.
>>                                    Kg1 Ke5 8. Ra5+ <HT>
>>               15->   5:21  -1.61   1. Rxg3 Qxg3 2. Ra4 Kc7 3. Ra7+ Kb6
>>                                    4. Ra4 Kc5 5. Kg1 Kc6 6. Kh1 Kd5 7.
>>                                    Kg1 Ke5 8. Ra5+ <HT>
>>
>>I think by your suggested move 99. R-R1 you really mean Ra1?
>>
>>If we do that, then we have this:
>>[D]1k6/6R1/8/8/5q1P/6p1/6P1/R6K b - - acn 106; acs 0; bm Qxh4+; ce 32762; dm 3;
>>pv Qxh4+ Kg1 Qd4+ Kh1 Qxa1#;
>
>Yes, I meant Ra1.
>
>Ok, thanks.  This is why I'm such a crappy Chess player, I wasn't thinking that
>the unprotected pawn was key to anything.  I came in in the middle of this game,
>and Comet was part of a pawn & more ahead score wise for several moves, I
>couldn't see RxP at all, but that pawn did have the King pinned in place for
>several moves.
>
>Pete
>
>Pete

Maybe White could build up a fortress,after sacrificing the h-pawn[just
keep pushing it].By the way,1k6/8/8/7q/8/5R2/6P1/6K1 is one such position. JAFM



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