Author: Laurence Chen
Date: 07:33:49 12/10/00
I decided to play a game of chess against Junior 6a on my Pentium III 600e last
night, and I was able to get a draw. It amazed me that the chess engine missed
a forced draw on move 36. That's it, I was able to see the draw and it took the
engine a few minutes before it acknowledge that the position was a draw.
Afterwards, I decided to analyse the critical position with Gambit Tiger 1.0,
Chess Tiger 13.0, and Nimzo 8. It took Gambit Tiger 1.0 and Chess Tiger 13.0
with 96 MB of Hash Table 16 min. to find the critical move 36. b5! which leads
to a forced draw. Nimzo 8 with 128 MB of hash table took much longer, it found
the move in the first few seconds but it changed its mind after a 10 seconds,
and went back to the move after 20 min. of pondering. Below is the pgn of the
game and the analysis done by the chess engines.
[Event "Level=40'/40+40'/40+40'. "]
[Site "Mississauga"]
[Date "2000.12.09"]
[Round "?"]
[White "CHEN, LAURENCE."]
[Black "Junior 6.0"]
[Result "1/2-1/2"]
[ECO "B33"]
[PlyCount "79"]
[EventDate "2000.12.09"]
{127MB, Nimzo8.ctg. Mississauga
} 1. e4 {0} 1... c5 {0} 2. Nf3 {4} 2... Nc6 {0} 3. d4
{1} 3... cxd4 {0} 4. Nxd4 {2} 4... e6 {0} 5. Nc3 {4} 5... Nf6 {0} 6. Ndb5 {4}
6... d6 {0} 7. Bf4 {7} 7... e5 {0} 8. Bg5 {4} 8... a6 {0} 9. Na3 {6} 9... b5 {0
} 10. Nd5 {5} 10... Be7 {0} 11. Bxf6 {2} 11... Bxf6 {0} 12. c3 {3} 12... O-O {0
} 13. Nc2 {3} 13... Rb8 {0} 14. Be2 {4} 14... Bg5 {0} 15. O-O {2} 15... a5 {0}
16. Qd3 {2} 16... Be6 {0} 17. Rfd1 {3} 17... Qd7 {0} 18. Qg3 {2} 18... h6 {0}
19. h4 {2} 19... Bd8 {0} 20. Nce3 {2} 20... Kh8 {0} 21. Rd2 {6} 21... Bb6 {0}
22. Nf5 {3} 22... Bxf5 {0} 23. exf5 {2} 23... f6 {0} 24. Bxb5 {4} 24... Bxf2+ {
0} 25. Qxf2 {3} 25... Rxb5 {0} 26. Rad1 {353} 26... a4 {0.05/16 112} 27. Ne3 {
90} 27... Rd8 {0.21/17 62} 28. Nc4 {40} 28... d5 {0.29/17 56} 29. Nb6 {3} 29...
Qb7 {0.16/17 163} 30. Nxd5 {25} 30... Qf7 {0.00/17 185} 31. Nb4 {207} 31...
Rxd2 {-0.11/17 81} 32. Qxd2 {3} 32... Nxb4 {-0.24/17 117} 33. cxb4 {3} 33...
Qxa2 {-0.26/18 193} 34. Qd8+ {3} 34... Qg8 {-0.27/18 39} 35. Qe7 {86} 35... Rb8
{-0.40/18 266} 36. b5 {84} 36... Qb3 {0.00/18 396} 37. Rd8+ {4} 37... Rxd8 {
0.00/19 114} 38. Qxd8+ {2} 38... Kh7 {0.00/21 154} 39. Qe8 {2} 39... Qc4 {
0.00/20 119} 40. Qg6+ {3} 1/2-1/2
[D]1r4qk/4Q1p1/5p1p/4pP2/pP5P/8/1P4P1/3R2K1 w - - 0 36
Analysis by Gambit Tiger 1.0:
00:00:00.9 -0.34 7 67678 Rd7 Re8 Qc5 Qb3 Qc3 Qxc3 bxc3 Rc8
00:00:01.0 -0.34 8 169901 Rd7 Re8 Qc5 Qb3 Qc3 Qxc3 bxc3 Rc8 Ra7 Rxc3 Rxa4
00:00:03.4 -0.60 9 500577 Rd7 Re8 Qc5 Qb3 Ra7 Qxb2 Rxa4 Qb1+ Kh2 Qxf5
00:00:11.9 -0.60 10 1652701 Rd7 Re8 Qc5 Qb3 Ra7 Qxb2 Rxa4 Qb1+ Kh2 Qxf5 Ra7
00:00:20.8 -0.82 11 3051909 Rd7 Re8 Qc5 Qb3 Ra7 Qxb2 Rxa4 Qb1+ Kh2 Qxf5 b5 Rc8
00:00:48.5 -0.76 11 7357485 Qc7 Rc8 Qd7 Qf8 Rd6 Kh7 Rb6 Rc4 Qxa4 Qd8 Qb5
00:01:13.8 -0.78 12 10653846 Qc7 Rc8 Qd7 Qc4 Qe6 Qc2 Ra1 Kh7 Rf1 Rd8 Qa2 Rd2
00:02:14.8 -1.12 13 20944411 Qc7 Rc8 Qd7 Qc4 Qe6 Qc2 Kh2 Rg8 Ra1 Qe4 Rxa4 Qxh4+
Kg1 Qd4+ Kh2
00:02:26.1 -0.96 13 23042779 Rd7 Re8 Qc5 Qb3 Qa7 Qg3 Rd1 Qg4 Rd7 Rc8 Qxa4 Rc1+
Kf2 Qxh4+ g3
00:06:54.1 -1.08 14 70721821 Rd7 Re8 Qc5 Qb3 Qa7 Rg8 Rb7 Qxb2 Qxa4 Qd4+ Kf1 Rc8
Qb3 Rc1+ Ke2 Qe4+ Kd2 Qxb7
00:13:03.1 -0.22 14 137554968 b5 Qb3 Rd8+ Rxd8 Qxd8+ Kh7 Qe8 Qe3+ Kh1 Qc1+ Kh2
Qf4+ Kg1 Qxf5 h5 Qb1+ Kh2 Qxb2
00:15:28.8 -0.22 15 163519870 b5 Qb3 Rd8+ Rxd8 Qxd8+ Kh7 Qe8 Qe3+ Kh1 Qc1+ Kh2
Qf4+ Kg1 Qxf5 h5 Qb1+ Kh2 Qxb2
00:22:50.6 -0.22 16 243131255 b5 Qb3 Rd8+ Rxd8 Qxd8+ Kh7 Qe8 Qe3+ Kh1 Qc1+ Kh2
Qf4+ Kg1 Qxf5 h5 Qb1+ Kh2 Qxb2
Analysis by Chess Tiger 13.0:
00:00:00.7 -0.34 7 67429 Rd7 Re8 Qc5 Qb3 Qc3 Qxc3 bxc3 Rc8
00:00:01.4 -0.34 8 169901 Rd7 Re8 Qc5 Qb3 Qc3 Qxc3 bxc3 Rc8 Ra7 Rxc3 Rxa4
00:00:02.9 -0.60 9 500577 Rd7 Re8 Qc5 Qb3 Ra7 Qxb2 Rxa4 Qb1+ Kh2 Qxf5
00:00:09.1 -0.60 10 1652701 Rd7 Re8 Qc5 Qb3 Ra7 Qxb2 Rxa4 Qb1+ Kh2 Qxf5 Ra7
00:00:17.4 -0.82 11 3051909 Rd7 Re8 Qc5 Qb3 Ra7 Qxb2 Rxa4 Qb1+ Kh2 Qxf5 b5 Rc8
00:00:41.0 -0.76 11 7357485 Qc7 Rc8 Qd7 Qf8 Rd6 Kh7 Rb6 Rc4 Qxa4 Qd8 Qb5
00:01:00.6 -0.78 12 10653846 Qc7 Rc8 Qd7 Qc4 Qe6 Qc2 Ra1 Kh7 Rf1 Rd8 Qa2 Rd2
00:01:59.4 -1.12 13 20944411 Qc7 Rc8 Qd7 Qc4 Qe6 Qc2 Kh2 Rg8 Ra1 Qe4 Rxa4 Qxh4+
Kg1 Qd4+ Kh2
00:02:11.8 -0.96 13 23042779 Rd7 Re8 Qc5 Qb3 Qa7 Qg3 Rd1 Qg4 Rd7 Rc8 Qxa4 Rc1+
Kf2 Qxh4+ g3
00:06:39.3 -1.08 14 70721821 Rd7 Re8 Qc5 Qb3 Qa7 Rg8 Rb7 Qxb2 Qxa4 Qd4+ Kf1 Rc8
Qb3 Rc1+ Ke2 Qe4+ Kd2 Qxb7
00:12:50.1 -0.22 14 137554968 b5 Qb3 Rd8+ Rxd8 Qxd8+ Kh7 Qe8 Qe3+ Kh1 Qc1+ Kh2
Qf4+ Kg1 Qxf5 h5 Qb1+ Kh2 Qxb2
00:15:15.4 -0.22 15 163519870 b5 Qb3 Rd8+ Rxd8 Qxd8+ Kh7 Qe8 Qe3+ Kh1 Qc1+ Kh2
Qf4+ Kg1 Qxf5 h5 Qb1+ Kh2 Qxb2
00:22:42.8 -0.22 16 243131255 b5 Qb3 Rd8+ Rxd8 Qxd8+ Kh7 Qe8 Qe3+ Kh1 Qc1+ Kh2
Qf4+ Kg1 Qxf5 h5 Qb1+ Kh2 Qxb2
Analysis by Nimzo 8 after 25 min.:
1. µ (-0.83): 36.b5 Qb3 37.Rd8+ Rxd8 38.Qxd8+ Kh7 39.Qe8 Qe3+ 40.Kh2 Qf4+ 41.Kg1
2. µ (-0.86): 36.h5 Re8 37.Qd7 Qf8 38.Rc1 e4 39.Qxa4 e3 40.Re1 Re5 41.Qa7
3. µ (-1.07): 36.Rd3 Qc8 37.b5 Qxf5 38.Rd8+ Rxd8 39.Qxd8+ Kh7 40.Qd2 Qb1+ 41.Kf2
4. µ (-1.08): 36.Rd7 Re8 37.Qd6 Qc4 38.Rd8 Qc1+ 39.Kh2 Qf4+ 40.Kg1 Qe3+ 41.Kh2
5. µ (-1.09): 36.Rd2 Re8 37.Qd7 Ra8 38.Qe7 Qc8 39.Rd7 Qc1+ 40.Kh2 Qf4+ 41.Kg1
6. µ (-1.09): 36.Rd6 Qc8 37.Rd7 Qc1+ 38.Kh2 Qf4+
7. µ (-1.16): 36.Kh2 Qc4 37.Rd8+ Rxd8 38.Qxd8+ Kh7 39.Kh3 Qf4 40.Qd7 Qxb4 41.Qe8
8. µ (-1.24): 36.Kh1 Qc4 37.Rd8+ Rxd8 38.Qxd8+ Kh7 39.Qe8 Qxh4+ 40.Kg1 Qd4+
41.Kh1
9. µ (-1.24): 36.Kf2 Qa2 37.Rd2 Qb1 38.Rd8+ Rxd8 39.Qxd8+ Kh7 40.Qd2 Qxf5+
41.Kg1
10. µ (-1.35): 36.Qd6 Kh7 37.Rd5 Qc8 38.Kh2 Ra8 39.Ra5 Rxa5 40.bxa5 Qxf5 41.a6
11. µ (-1.35): 36.Qc7 Qc8 37.Qe7 Qxf5
12. -+ (-1.53): 36.g4 Qc4 37.Rd8+ Rxd8 38.Qxd8+ Kh7 39.Qd1 Qxb4 40.Qe2 h5
41.gxh5
13. -+ (-1.96): 36.Qe6 Rxb4 37.Qe7 Rb8 38.Rd2 Qc8 39.Kh2 Kh7 40.Qd6 Rb3 41.g4
14. -+ (-1.96): 36.Qa7 Rxb4 37.Qe7 Rb8
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