Author: Mike Hood
Date: 05:17:54 01/13/03
Go up one level in this thread
On January 13, 2003 at 07:47:05, Mike Hood wrote: >On January 13, 2003 at 00:27:28, Drexel,Michael wrote: > >>On January 12, 2003 at 21:18:25, Mike Hood wrote: >> >>>A question out of morbid curiosity: what's the highest incorrect score that >>>anyone has seen a top chess program award? ie, what's the highest winning score >>>that a chess program gives itself, blind to the fact that it must unavoidably >>>lose? >>> >>>The highest score I have seen is Fritz 8 in the recently posted "Georgian >>>Peasant" game. >>> >>>[D] 8/3P3k/n2K3p/2p3n1/1b4N1/2p1p1P1/8/3B4 w >>> >>>1. Nf6+ Kg7 2. Nh5+ Kg6 3. Bc2+ Kxh5 4. d8=Q Nf7+ 5. Ke6 Nxd8+ 6. Kf5 e2 7. Be4 >>>e1=N 8. Bd5 c2 9. Bc4 c1=N 10. Bb5 Nc6 11. Bxc6 Nc7 12. Ba4 Nc2 13. Bxc2 Ne2 >>>14. Bd1 Nd5 15. Bxe2# 1-0 >>> >>>After 3. Bc2+, Fritz 8's winning score for Black soars ever higher: >>> >>>Analysis by Fritz 8: >>> >>>3...Kxh5 4.Bd1+ Kg6 5.Kc6 Nb8+ 6.Kd6 Nxd7 7.Kxd7 Kf5 >>> -+ (-7.56) Depth: 7/21 00:00:00 71kN >>>3...Kxh5! >>> -+ (-7.84) Depth: 8/27 00:00:00 182kN >>>3...Kxh5! >>> -+ (-8.13) Depth: 9/30 00:00:01 470kN >>>3...Kxh5-- >>> -+ (-7.84) Depth: 10/23 00:00:01 489kN >>>3...Kxh5 4.Bd1+ Kg6 >>> -+ (-7.84) Depth: 10/29 00:00:01 678kN >>>3...Kxh5! >>> -+ (-8.13) Depth: 11/29 00:00:03 1375kN >>>3...Kxh5! >>> -+ (-8.41) Depth: 12/35 00:00:08 3525kN >>>3...Kxh5! >>> -+ (-8.69) Depth: 13/38 00:00:22 9391kN >>>3...Kxh5! >>> -+ (-8.97) Depth: 13/40 00:00:34 14045kN >>>3...Kxh5 4.Bd1+ Kg6 5.Kd5 Nf7 6.Kc4 Ne5+ 7.Kb3 Nxd7 8.Be2 Nc7 9.Kc2 Kf6 >>> -+ (-9.16) Depth: 13/40 00:00:45 18913kN >>>3...Kxh5 4.Bd1+ Kg6 5.Kd5 Nf7 6.Kc4 Ne5+ 7.Kb3 Nxd7 8.Kc2 Ne5 9.Be2 Nc7 10.Kd1 >>>Kf5 11.Kc2 >>> -+ (-9.34) Depth: 14/40 00:01:27 34783kN >>>3...Kxh5! >>> -+ (-9.63) Depth: 15/44 00:03:03 72060kN >>>3...Kxh5 4.Bd1+ Kg6 5.Kd5 Nf7 6.Kc4 Ne5+ 7.Kb3 Nxd7 8.Kc2 Ne5 9.Be2 c4 10.Bf1 >>>Nc5 11.Be2 Nd3 >>> -+ (-9.78) Depth: 16/46 00:06:14 149982kN >>>3...Kxh5! >>> -+ (-10.06) Depth: 17/47 00:15:11 372788kN >>> >>>It's not a matter of Fritz choosing the wrong move for Black. Kxh5 is correct, >>>but Fritz doesn't expect White to play d8Q! >>> >>>I'm not just knocking Fritz. None of the chess programs in my possession do any >>>better. I even tried setting Fritz's selectivity parameter to zero, to prevent >>>null move generation, but found no improvement. So, does anyone have any other >>>position that the current top programs totally misjudge? >> >>[D] kbn1nBRQ/4P1PQ/4P1PQ/6PB/6P1/8/8/7K w - - 0 6 >> >>Analysis by Fritz 8: >> >>6.Kg1 Ba7+ 7.Kh2 Nb6 8.Kh1 Nc4 9.Kg2 Ne3+ 10.Kh1 >> +- (34.22) Depth: 7/15 00:00:00 3kN >>6.Kg1 Ba7+ 7.Kh2 Nb6 8.Kg2 Nd5 9.Kg3 Ndc7 10.Kh2 Nxe6 >> +- (34.06) Depth: 8/17 00:00:00 6kN >>6.Kg1 Ba7+ 7.Kh2 Nb6 8.Kg2 Nd5 9.Kh1 Bb8 >> +- (33.88) Depth: 9/19 00:00:00 13kN >>6.Kg1 Ba7+ 7.Kh2 Nb6 8.Kg2 Nd5 9.Kh1 >> +- (33.88) Depth: 10/22 00:00:00 24kN >>6.Kg1-- >> +- (33.31) Depth: 11/11 00:00:00 24kN >>6.Kg1 Ba7+ 7.Kh2 >> +- (33.31) Depth: 11/18 00:00:00 56kN >>6.Kg2! >> +- (33.34) Depth: 11/18 00:00:00 75kN >>6.Kg2 Nb6 7.Kf3 Nd5 8.Ke2 Nf4+ 9.Kf2 Ba7+ 10.Kf3 Bb8 11.Ke4 >> +- (33.25) Depth: 12/26 00:00:00 213kN >>6.Kg2 Nb6 7.Kf3 Nd5 8.Ke2 Bf4 9.Kf2 Kb7 10.Kf1 Kb8 11.Kf2 Ndf6 12.gxf6 >> +- (33.13) Depth: 13/28 00:00:00 410kN >>6.Kg2 Nb6 7.Kf3 Nd5 8.Ke2 Bf4 9.Kf2 Kb8 10.Kg2 Ka8 11.Kf1 Ndf6 12.gxf6 >> +- (32.97) Depth: 14/29 00:00:00 612kN >>6.Kg2 Nb6 7.Kf3 Nd5 8.Ke2 Bf4 9.Kf2 Kb8 10.Kf3 Kc8 11.Ke2 Kb8 >> +- (32.84) Depth: 15/30 00:00:01 1041kN >>6.Kg2-- >> +- (32.56) Depth: 16/30 00:00:01 1412kN >>6.Kg2 Nb6 7.Kf3 Nd5 >> +- (32.56) Depth: 16/30 00:00:02 1653kN >>6.Kg2-- >> +- (32.28) Depth: 17/32 00:00:02 2074kN >>6.Kg2 Nb6 7.Kf3 Nd5 >> +- (32.28) Depth: 17/32 00:00:03 2966kN >>6.Kg2-- >> +- (32.00) Depth: 18/32 00:00:04 3308kN >>6.Kg2 Bf4 7.Kf3 Bc1 8.Kg3 Ncd6 9.Kf2 Ne4+ 10.Kf3 Nc5 11.Kg3 Nxe6 12.Kh2 Bxg5 >>13.Kg2 Nf4+ 14.Kh1 Bxh6 >> +- (28.53) Depth: 18/50 00:00:12 10755kN >>6.Kg2 Bf4 7.Kf3 Bc1 8.Kg3 Ncd6 9.Kf2 Ne4+ 10.Kf3 Nc5 11.Kg3 Nxe6 12.Kh2 Bxg5 >>13.Kg2 Nf4+ 14.Kh1 Bxh6 >> +- (28.53) Depth: 19/36 00:00:15 13607kN >>6.Kg2 Bf4 7.Kf3 Bc1 8.Kg3 Ncd6 9.Kf2 Ne4+ 10.Kf3 Nc5 11.Kg3 Nxe6 12.Kh2 Bxg5 >>13.Kg2 Kb7 14.Qxg5 Nxg5 15.Qh6 Ne4 >> +- (28.53) Depth: 20/36 00:00:20 18279kN >>6.Kg2 Bf4 7.Kf3 Bc1 8.Kg3 Ncd6 9.Kf2 Ne4+ 10.Kf3 Nc5 11.Kg3 Nxe6 12.Kh2 Bf4+ >>13.Kg1 Nxg5 14.Kg2 Ka7 15.Kh1 Nh3 >> +- (28.38) Depth: 21/42 00:00:34 30397kN >>6.Kg2 Bf4 7.Kf3 Bc1 8.Kg3 Ncd6 9.Kf2 Ne4+ 10.Kf3 Nc5 11.Kg3 Nxe6 12.Kh2 Bf4+ >>13.Kg1 Nxg5 14.Kg2 Ka7 15.Kh1 Ne6 >> +- (28.38) Depth: 22/44 00:00:51 46491kN >>6.Kg2 Bf4 7.Kf3 Bc1 8.Kg3 Ncd6 9.Kf2 Ne4+ 10.Kf3 Nc5 11.Kg3 Nxe6 12.Kh2 Bf4+ >>13.Kg1 Nxg5 14.Kg2 Ka7 15.Kh1 Ne6 >> +- (28.38) Depth: 23/46 00:01:22 78628kN >>6.Kg2 Bf4 7.Kf3 Bc1 8.Kg3 Ncd6 9.Kf2 Ne4+ 10.Kf3 Nc5 11.Kg3 Nxe6 12.Kh2 Bf4+ >>13.Kg1 Nxg5 14.Kg2 Ka7 15.Kh1 Ka8 >> +- (28.38) Depth: 24/47 00:02:31 147989kN > >Thanks, Michael, although judging by the line Fritz is expecting, it could be a >matter of horizon effect that will be solved by a deep enough search. I suspect >that if I let Fritz run for a few hours the evaluation will slowly get smaller. >I "only" have a Pentium 3-733, but I'll let it run until this evening. After the first 45 minutes... Fritz's evaluation has dropped slightly, but unfortunately his highest priority is capturing the pawn on e6. This takes him 7 moves. Let's see if he gets round to a sensible attack when this totally superfluous manoeuvre is over.....
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