Author: Aaron Gordon
Date: 17:15:24 12/11/03
First of all, I'd like to say having EGTBs fixes this problem. However, take a
look at what happens when Shredder 7.04 isn't using any EGTBs.
Here is the game:
[Event "ICS unrated blitz match"]
[Site "freechess.org"]
[Date "2003.12.10"]
[Round "-"]
[White "ShredderAMD"]
[Black "FritzAMD"]
[Result "1/2-1/2"]
[WhiteElo "0"]
[BlackElo "0"]
[TimeControl "300+3"]
1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. d4 cxd4 5. Nxd4 Qc7 6. Be2 b5 7. O-O Bb7 8.
Re1 b4 9. Na4 Bxe4 10. Bf3 Bb7 11. g3 Nc6 12. Bf4 Qa5 13. Nxc6 Bxc6 14.
Bxc6 dxc6 15. Re5 Qd8 16. Qh5 g6 17. Qe2 Ne7 18. Rd1 Nd5 19. c4 bxc3 20.
Nxc3 Be7 21. Bh6 Qd7 22. Qf3 Rg8 23. Ree1 g5 24. Qh5 Nf6 25. Qe2 Qc7 26.
Kh1 Nd5 27. Qh5 Rg6 28. Ne4 g4 29. Bd2 O-O-O 30. Kg2 h6 31. Kg1 Kb7 32. b4
Qb6 33. a4 Nf6 34. Qe5 Rd5 35. Qb2 Nxe4 36. Rxe4 Qd8 37. b5 cxb5 38. axb5
axb5 39. Rb1 Qd7 40. Bf4 Rd1+ 41. Re1 Rxe1+ 42. Rxe1 Rg5 43. Bxg5 Bxg5 44.
Qe2 h5 45. Qe5 Be7 46. Qxh5 Bb4 47. Rb1 f5 48. h4 Bc5 49. Re1 Qd4 50. Qh7+
Kc8 51. Rf1 Qe5 52. Kh2 b4 53. Rc1 Qd4 54. Qg8+ Kd7 55. Qf7+ Be7 56. Kg1 b3
57. Re1 Qd5 58. Qg7 Ke8 59. Rc1 Bc5 60. Qc3 Bf8 61. Rb1 Kf7 62. Qxb3 Qxb3
63. Rxb3 Bc5 64. Rc3 Bb4 65. Rc7+ Kf6 66. Kg2 Ba5 67. Rc2 Bb4 68. f3 gxf3+
69. Kxf3 Bf8 70. g4 fxg4+ 71. Kxg4 Bh6 72. Rf2+ Kg7 73. h5 Bc1 74. Kh4 Bh6
75. Kg3 Bg5 76. Kf3 e5 77. Rc2 Kh6 78. Kg4 Be3 79. Rc6+ Kh7 80. Kf5 Bf4 81.
Ra6 Bh2 82. Kg4 Bf4 83. Ra7+ Kg8 84. Kf5 Be3 85. Rb7 Kf8 86. Kxe5 Ke8 87.
Kf5 Kd8 88. Rg7 Ke8 89. Kg6 Bd4 90. h6 Kd8 91. h7 Bxg7 92. Kxg7 Kc7 93.
h8=Q Kb6 94. Qc8 Kb5 95. Qg4 Kc5 96. Kf6 Kb5 97. Ke6 Ka5 98. Qc4 Kb6 99.
Qb4+ Kc6 100. Qb1 Kc5 101. Qe4 Kb6 102. Qb4+ Kc6 103. Ke7 Kd5 104. Kf6 Kc6
105. Ke6
{Game drawn by mutual agreement} 1/2-1/2
As you can see, this is *NO* draw. What I'd like you guys to see is this
particular position (Remember, when analyzing w/ S7.04 disable EGTBs):
[D]8/2k3KP/8/8/8/8/8/8 w - - 0 93
Play h8=Q and let shredder think on that a bit... :)
Analysis by Shredder 7.04:
93...Kd6
+- (12.30) Depth: 1/1 00:00:00
93...Kd6
+- (12.30) Depth: 1/1 00:00:00
93...Kd6 94.Qc8
+- (12.84) Depth: 2/3 00:00:00
93...Kd6 94.Qe8
+- (12.98) Depth: 2/3 00:00:00
93...Kd6 94.Qf8+ Kd5 95.Qe7
+- (12.90) Depth: 3/5 00:00:00
93...Kd6 94.Qh5 Kc6 95.Qa5
+- (13.11) Depth: 4/11 00:00:00
93...Kc6 94.Qh5
+- (13.10) Depth: 4/11 00:00:00
93...Kc6 94.Qh5 Kb6 95.Qd5
+- (13.10) Depth: 4/11 00:00:00
93...Kc6 94.Qc8+ Kd5 95.Kf6 Kd4 96.Qe6
+- (13.34) Depth: 5/13 00:00:00
93...Kd6 94.Qd8+ Kc5 95.Qe7+ Kc4 96.Qe6+ Kb4 97.Qd6+ Ka4 98.Qa6+ Kb3 99.Qb7+ Ka3
+- (13.32) Depth: 5/13 00:00:00
93...Kd6 94.Qh2+ Kc5 95.Kf6 Kc4 96.Qb2
+- (13.12) Depth: 5/13 00:00:00
93...Kd6 94.Kf7 Kc6 95.Qc3+ Kd5 96.Kf6 Kd6
+- (13.38) Depth: 6/15 00:00:00
93...Kd6 94.Kf7 Kd5 95.Qc3 Ke4 96.Ke6
+- (13.44) Depth: 6/15 00:00:00
93...Kd6 94.Kf7 Kd5 95.Qc3 Ke4 96.Kf6 Kd5 97.Qe3
+- (13.48) Depth: 7/17 00:00:00 53kN
93...Kd6 94.Kf7 Kd5 95.Qc3 Kd6 96.Kf6 Kd5 97.Qd3+ Kc6 98.Ke5
+- (13.51) Depth: 8/19 00:00:00 89kN
93...Kd6 94.Kf7 Kd5 95.Qc3 Ke4 96.Ke6 Kf4 97.Qe5+ Kg4 98.Qf6
+- (13.67) Depth: 9/21 00:00:00 256kN
93...Kd6 94.Kf7 Kd5 95.Qc3 Ke4 96.Ke6 Kf4 97.Qd3 Kg4 98.Qe4+ Kh5 99.Qf3+ Kh6
100.Qf4+ Kh5
+- (13.75) Depth: 10/23 00:00:00 380kN
93...Kd6 94.Kf7 Kd5 95.Qc3 Ke4 96.Ke6 Kf4 97.Qh3 Ke4 98.Qg4+ Kd3 99.Kd5 Kd2
+- (13.78) Depth: 11/25 00:00:00 584kN
93...Kd6 94.Kf6 Kd5 95.Kf5 Kc4 96.Ke4 Kb3 97.Qd4 Ka2 98.Qd3 Kb2 99.Kd5 Ka2
100.Qc2+ Ka3 101.Qc3+ Ka2 102.Qb4 Ka1 103.Qa3+ Kb1 104.Qc3 Ka2 105.Qb4 Ka1
106.Qa3+ Kb1 107.Qc3 Ka2
+- (13.87) Depth: 12/27 00:00:03 3186kN
93...Kd6 94.Kf6 Kd5 95.Qa8+ Kd4 96.Qa4+ Ke3 97.Ke5 Kf2 98.Qa3 Kf1 99.Qf3+ Kg1
+- (14.11) Depth: 13/27 00:00:03 3643kN
93...Kd6 94.Kf6 Kd5 95.Qa8+ Kd4 96.Qa4+ Ke3 97.Ke5 Kd3 98.Qe4+ Kc3 99.Qe3+ Kb4
100.Qd4+ Kb3 101.Qd3+ Ka4 102.Qc4+ Ka5 103.Kd5 Kb6
+- (14.12) Depth: 14/29 00:00:04 4080kN
93...Kd6 94.Kf6 Kd5 95.Qa8+ Kc4 96.Qe4+ Kb3 97.Qd3+ Ka4 98.Qc4+ Ka3 99.Qc3+ Ka4
+- (14.37) Depth: 15/29 00:00:04 4283kN
93...Kd6 94.Kf6 Kd5 95.Qa8+ Kc5 96.Qa4 Kd6 97.Qd1+ Kc5 98.Ke6 Kc4 99.Qa4+ Kd3
100.Ke5 Kc3 101.Qe4 Kb3 102.Qd3+ Kb2 103.Kd4 Ka2
+- (#29) Depth: 15/29 00:00:04 4420kN
93...Kd6 94.Qh5 Kc6 95.Kf6 Kd6 96.Qe5+ Kd7 97.Qc5 Kd8 98.Ke6 Ke8 99.Qc7 Kf8
100.Kd6 Kg8 101.Qc4+ Kf8 102.Qc8+ Kg7 103.Qc3+ Kh6 104.Qe3+ Kg6
+- (#2) Depth: 15/29 00:00:10 10488kN
93...Kd6 94.Qh5 Kc6 95.Kf7 Kd6 96.Qf5 Kc7 97.Ke6
-+ (-#2) Depth: 16/29 00:00:13 13343kN
93...Kd6 94.Qh5 Kc6 95.Kf6 Kc7 96.Ke6 Kb6 97.Qd5 Kc7 98.Qb5 Kd8 99.Kd6 Kc8
100.Qb4 Kd8 101.Qa4 Kc8 102.Qd7+ Kb8 103.Ke6 Ka8 104.Qb5 Ka7 105.Qb3 Ka6 106.Qb4
Ka7 107.Kd5 Ka8
-+ (-#13) Depth: 17/31 00:00:16 16668kN
93...Kd6 94.Qh5 Kc6 95.Kf6 Kc7 96.Qc5+ Kb8 97.Ke6 Kb7 98.Kd6 Kb8 99.Qb4+ Ka7
-+ (-#25) Depth: 18/29 00:00:17 17507kN
93...Kd6 94.Qh5 Kc6 95.Kf6 Kc7 96.Qc5+ Kb8 97.Ke6 Kb7 98.Kd6 Ka6 99.Qb4 Ka7
100.Qa5+ Kb8 101.Qd5
-+ (-#32) Depth: 18/32 00:00:18 19145kN
93...Kd6 94.Qh5 Kc6 95.Kf6 Kc7 96.Qc5+ Kb8 97.Ke6 Kb7 98.Kd5 Ka8 99.Qb4 Ka7
100.Qb5 Ka8 101.Kd6 Ka7 102.Qa4+ Kb8 103.Qb3+ Kc8 104.Qb4 Kd8 105.Qa4 Kc8
106.Qd7+ Kb8 107.Ke6 Ka8
-+ (-#45) Depth: 19/33 00:00:20 21040kN
93...Kd6 94.Qh5 Kc6 95.Kf6 Kb6 96.Ke6 Ka6 97.Kd6 Kb6 98.Qe5 Ka7 99.Qa5+ Kb8
100.Qc5 Kb7 101.Qb5+ Kc8 102.Qb4 Kd8 103.Qc3 Ke8 104.Qg7 Kd8 105.Qe7+ Kc8
106.Qe6+ Kb7 107.Qe5 Kb6
-+ (-#53) Depth: 19/35 00:00:25 25638kN
93...Kd6 94.Qh5 Kc6 95.Kf7 Kb7 96.Qb5+ Kc8 97.Qb4 Kc7 98.Qc5+ Kd7 99.Kf6 Ke8
100.Ke6 Kd8 101.Qe7+ Kc8 102.Kf6 Kb8 103.Qd7 Ka8 104.Qb5 Ka7 105.Ke6 Ka8 106.Kf7
Ka7 107.Ke6 Ka8
-+ (-#66) Depth: 20/34 00:00:26 27210kN
93...Kd6 94.Qh5 Kc6 95.Kg6 Kc7 96.Qc5+ Kb7 97.Qb5+ Kc8 98.Kf6 Kc7 99.Qc5+ Kd8
100.Qe7+ Kc8 101.Ke6 Kb8 102.Qd7 Ka8 103.Qb5 Ka7 104.Kd5 Ka8 105.Kd6 Ka7 106.Ke6
Ka8 107.Kd6 Ka7
-+ (-#67) Depth: 20/37 00:00:41 42271kN
93...Kd6 94.Qh5 Kc6 95.Kg6 Kb6 96.Qd5 Kc7 97.Qc5+ Kb7 98.Kf6 Kb8 99.Ke6 Kb7
100.Kd6 Ka6 101.Qd5 Ka7 102.Qb5 Ka8 103.Ke6 Ka7 104.Kf7 Ka8 105.Ke6 Ka7 106.Kf7
Ka8 107.Ke6 Ka7
-+ (-#79) Depth: 21/31 00:00:46 47048kN
Hit space bar and play through the moves for a while.. you'll see white will get
into a position to play a mate in 1 but does NOT play it! If you clear the hash
and then search it'll find the mate in 1. I'm thinking it is a problem with
hashtable collisions or something of the sort.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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