Author: Mike Hood
Date: 04:47:05 01/13/03
Go up one level in this thread
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.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.