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Subject: Re: Easy mate

Author: Frank Phillips

Date: 11:43:53 09/13/03

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On September 13, 2003 at 14:31:55, Rafael Andrist wrote:

>On September 13, 2003 at 14:08:37, John Merlino wrote:
>
>>On September 13, 2003 at 10:23:41, Frank Phillips wrote:
>>
>>>[D]8/4k3/8/8/4Kp1p/5N1N/8/8 w - -
>>>
>>>Just an amusing position.
>>>
>>>White to move and win.  Perhaps the longest forced mate my program has played.
>>>I was not sure whether it would be caught out by the 50 moves rule.  (Any credit
>>>goes to Eugene of course.).
>>>
>>>It traded down from B+Pawns versus 2N+Pawns to reach this endgame.  My heart
>>>sank and I was already to fix yet another evaluation quirk - maybe still need
>>>to.
>>>
>>>Frank
>>
>>Kxf4 is a forced mate in 90 moves and it will NOT be caught by the 50-move rule.
>
>No, after Kxf4 it is a draw. You need 51 moves to the next forced capture/pawn
>push with best defence.
>
>Also, I did a short search up to depth 13 and could not find a win which would
>not have been prohibited by the 50-move rule.
>
>The endgame is anyway only won in about 23% of all cases and even then, you will
>fail to win it in more than 50% without the appropriate endgame tables.
>
>regards
>Rafael B. Andrist


(Against Crafty, both using 5man egtb.).

[Event "Computer chess game"]
[Site "asus.home.com"]
[Date "2003.09.13"]
[Round "-"]
[White "searcher"]
[Black "Crafty-19.3"]
[Result "1-0"]
[TimeControl "300+3"]
[FEN "8/4k3/8/8/5K1p/5N1N/8/8 b - - 0 1"]
[SetUp "1"]

{--------------
. . . . . . . .
. . . . k . . .
. . . . . . . .
. . . . . . . .
. . . . . K . p
. . . . . N . N
. . . . . . . .
. . . . . . . .
black to play
--------------}
1... Kd6 2. Ke4 Kc5 3. Nfg5 Kc6 4. Kd4 Kd6 5. Ne4+ Ke6 6. Kc5 Kd7 7. Kd5
Ke7 8. Kc6 Ke6 9. Neg5+ Ke5 10. Kc5 Kf6 11. Kd6 Kf5 12. Kd5 Kf6 13. Ke4 Ke7
14. Ke5 Kd7 15. Kd5 Kc7 16. Nf7 Kb6 17. Nd6 Ka5 18. Kc5 Ka4 19. Ne4 Kb3 20.
Kb5 Kb2 21. Kb4 Kc2 22. Kc4 Kc1 23. Kd3 Kb2 24. Nc5 Kc1 25. Na4 Kb1 26. Kd2
Ka2 27. Kc3 Kb1 28. Nc5 Kc1 29. Nb3+ Kb1 30. Nd2+ Ka2 31. Nc4 Kb1 32. Kd2
Ka2 33. Kc2 Ka1 34. Kb3 Kb1 35. Nb2 Kc1 36. Kc3 Kb1 37. Nd3 Ka2 38. Kb4 Kb1
39. Kb3 Ka1 40. Ne5 Kb1 41. Nf3 Kc1 42. Kc3 Kd1 43. Nf4 h3 44. Nh2 Kc1 45.
Nd5 Kd1 46. Ne3+ Kc1 47. Kc4 Kb2 48. Kb4 Ka1 49. Nc4 Ka2 50. Kc3 Kb1 51.
Kd2 Ka1 52. Kc1 Ka2 53. Kc2 Ka1 54. Kb3 Kb1 55. Nd2+ Kc1 56. Kc3 Kd1 57.
Nb3 Ke1 58. Kd4 Ke2 59. Ke4 Ke1 60. Ke3 Kd1 61. Kd3 Ke1 62. Nd4 Kd1 63. Ne2
Ke1 64. Nc3 Kf2 65. Kd2 Kg2 66. Ke3 Kg3 67. Ne2+ Kg2 68. Nd4 Kg3 69. Ndf3
Kg2 70. Nd2 Kg3 71. Ndf1+ Kh4 72. Kf4 Kh5 73. Kf5 Kh6 74. Kf6 Kh7 75. Ne3
Kh6 76. Neg4+ Kh7 77. Kf7 Kh8 78. Nh6 Kh7 79. Nf5 Kh8 80. Kg6 Kg8 81. Ng7
Kf8 82. Kf6 Kg8 83. Ne6 Kh7 84. Kg5 Kg8 85. Kg6 Kh8 86. Kf7 Kh7 87. Ng4 h2
88. Nf8+ Kh8
{Black resigns} 1-0


(Actual game - Kec had only 3/4 egtb.).

[Event "ICS rated blitz match"]
[Site "64.71.131.140"]
[Date "2003.09.13"]
[Round "-"]
[White "siliconslayer"]
[Black "Kec"]
[Result "1-0"]
[WhiteElo "2390"]
[BlackElo "2354"]
[TimeControl "120+5"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O d6 6.Re1 b5 7.Bb3 Be7 8.c3 O-O 9.d3
Na5 10.Bc2 c5 11.Nbd2 Be6 12.d4 cxd4 13.cxd4 Qc7 14.Re3 Rfc8 15.Rc3 Qb6 16.d5
Bd7 17.Rxc8+ Rxc8 18.Bd3 Ng4 19.Qe2 Nb7 20.h3 Nf6 21.Nb3 a5 22.Be3 Qd8 23.Bxb5
a4 24.Nbd2 Rc2 25.b4 axb3 26.axb3 Nc5 27.Bxc5 Bxb5 28.Qxb5 Rxc5 29.Qb7 Rc7
30.Qa6 g6 31.b4 Rc2 32.Rb1 Bf8 33.b5 Nd7 34.b6 Rc8 35.Nc4 Nc5 36.Qa5 Ra8 37.Qe1
Ra4 38.Na5 Rxe4 39.Qc3 Ra4 40.b7 Nxb7 41.Nxb7 Qa8 42.Qc7 Ra1 43.Rxa1 Qxa1+
44.Kh2 Qa7 45.Qc8 e4 46.Ng1 Qxf2 47.Nd8 Qf4+ 48.Kh1 Qg5 49.Qa8 Kg7 50.Qa1+ Qf6
51.Qa5 Kg8 52.Nc6 Bh6 53.Qa4 Qh4 54.Qb4 Qf4 55.Qb8+ Kg7 56.Qb2+ Qf6 57.Qb1 Qf5
58.Qa1+ Qf6 59.Qb1 Qf5 60.Qb2+ Qf6 61.Qc2 Qf5 62.Qc4 Bg5 63.Nd4 Qe5 64.Nge2 Be3
65.Nb5 Bc5 66.Nec3 e3 67.Ne2 Qa1+ 68.Kh2 Qe5+ 69.g3 Qf6 70.Qc3 Qxc3 71.Nexc3 f5
72.Kg2 Kf6 73.Kf3 Ke5 74.Nc7 Kd4 75.Na4 Bb4 76.Ne6+ Kxd5 77.Nf4+ Kc6 78.Kxe3 d5
79.Ne2 Kd6 80.h4 Ke5 81.Nd4 Kd6 82.Nb2 Bc5 83.Na4 Bb4 84.Ke2 Kd7 85.Kf2 Kd6
86.Nb2 Bc5 87.Ke3 Bb6 88.Na4 Ba5 89.Nb2 Bb6 90.Nd3 Ba7 91.Ne1 Ke5 92.Kd3 Bb6
93.Nef3+ Kf6 94.Ne2 Bc5 95.Nfd4 Ke5 96.h5 gxh5 97.Nf3+ Kf6 98.Nf4 Bf2 99.Nxh5+
Kg6 100.Ke2 Bxg3 101.Nxg3 f4 102.Nh1 Kf6 103.Nf2 Kf5 104.Kd3 h5 105.Kd4 Kf6
106.Kxd5 Kf5 107.Kd4 Kf6 108.Ke4 h4 109.Nh3 Ke7 110.Kxf4 Ke6 111.Ke4 Kd6 112.Kd4
Kc6 113.Kc4 Kd6 114.Nd4 Ke5 115.Kc5 Ke4 116.Ne6 Ke3 117.Neg5 Kd3 118.Nf2+ Kd2
119.Ngh3 Ke3 120.Kd5 Ke2 121.Kd4 Kd2 122.Ng4 Kc2 123.Kc4 Kd2 124.Ng5 h3 125.Nf3+
Ke2 126.Nfh2 Kd2 127.Kd4 Kc2 128.Ne5 Kb3 129.Nc6 Ka4 130.Kc4 Ka3 131.Nd8 Kb2
132.Ne6 Ka3 133.Nc5 Kb2 134.Kd3 Kc1 135.Kc3 Kb1 136.Nd3 Ka2 137.Kb4 Kb1 138.Kb3
Ka1 139.Kc2 Ka2 140.Nb2 Ka3 141.Kc3 Ka2 142.Nc4 Kb1 143.Kd2 Ka2 144.Kc2 Ka1
145.Kb3 Kb1 146.Nd2+ Kc1 147.Kc3 Kd1 148.Nb3 Ke2 149.Kd4 Kf2 150.Nc1 Kg3 151.Ke3
Kh4 152.Kf4 Kh5 153.Kf5 Kh6 154.Kf6 Kh7 155.Nd3 Kg8 156.Ke7 Kh7 157.Kf7 Kh6
158.Kf6 Kh5 159.Ne5 Kh6 160.Neg4+ Kh7 161.Kf7 Kh8 162.Nh6 Kh7 163.Nf5 Kh8
164.Kg6 Kg8 165.Ng7 Kf8 166.Kf6 Kg8 167.Ne6 Kh7 168.Kg5 Kg8
{Kec resigns}
1-0



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