Author: Ernst Walet
Date: 10:49:48 04/09/00
Go up one level in this thread
On April 09, 2000 at 13:16:59, Mark Young wrote: > >I can explain this I think, it is a problem with Fritz 6a's probe depth of the >tablebase. The default is set to 3, and below in the first analysis will find >Fritz 6a can not see that Kf3 is a draw in a short time. Below that is the >analysis of Fritz 6a with the probe depth of the tablebases set to 0. ( the >lower the number the more fritz 6a probes the tablebases (more TB hits)) When >set to a lower setting or more tablebase probes, Fritz 6a see very quickly that >Kf3 is a draw and Kh3 is winning. > >New position >8/8/5K2/6Q1/4ppk1/4P3/5q2/8 b - - 0 1 > >Analysis by Fritz 6: Tablebase depth set to 3(default) > >1...Kg4-f3 > ³ (-0.69) Depth: 1/3 00:00:00 >1...Kg4-f3 2.Qg5xf4+ Kf3-e2 > = (-0.19) Depth: 1/5 00:00:00 >1...Kg4-f3 2.Qg5xf4+ Kf3-e2 > = (-0.19) Depth: 2/7 00:00:00 >1...Kg4-h3 > ³ (-0.44) Depth: 2/7 00:00:00 >1...Kg4-h3 2.e3xf4 e4-e3 > ³ (-0.44) Depth: 3/7 00:00:00 >1...Kg4-h3! > µ (-0.75) Depth: 4/6 00:00:00 >1...Kg4-h3 2.e3xf4 e4-e3 3.Kf6-f5 > µ (-0.88) Depth: 4/7 00:00:00 >1...Kg4-h3 2.e3xf4 e4-e3 3.Kf6-f5 Qf2-c2+ 4.Kf5-e6 > µ (-0.88) Depth: 5/9 00:00:00, tb=1 >1...Kg4-h3 2.e3xf4 e4-e3 3.Kf6-f5 Qf2-c2+ 4.Kf5-e6 e3-e2 > µ (-0.88) Depth: 6/13 00:00:00, tb=2 >1...Kg4-h3 2.Qg5-f5+ Kh3-g2 3.e3xf4 e4-e3 4.Qf5-g4+ > ³ (-0.69) Depth: 7/15 00:00:00 6kN, tb=8 >1...Kg4-h3 2.Qg5-f5+ Kh3-g2 3.e3xf4 Kg2-f3 4.Qf5-g5 e4-e3 > µ (-0.91) Depth: 8/20 00:00:00 46kN, tb=33 >1...Kg4-h3 2.Qg5-f5+ Kh3-g2 3.e3xf4 Kg2-f3 4.Qf5-g5 e4-e3 > µ (-0.91) Depth: 9/22 00:00:00 189kN, tb=136 >1...Kg4-h3 2.Qg5-f5+ Kh3-g2 3.e3xf4 Kg2-f3 4.Qf5-g5 e4-e3 > µ (-0.91) Depth: 10/25 00:00:01 510kN, tb=429 >1...Kg4-f3 > µ (-0.94) Depth: 10/25 00:00:02 654kN, tb=577 >1...Kg4-f3 2.e3xf4 e4-e3 3.Kf6-f5 Qf2-c2+ 4.Kf5-f6 Qc2-c6+ 5.Kf6-f7 e3-e2 >6.Qg5-h5+ > -+ (-2.66) Depth: 10/25 00:00:04 1535kN, tb=890 >1...Kg4-f3! > -+ (-2.97) Depth: 11/27 00:00:06 2273kN, tb=1529 >1...Kg4-f3! 2.Qg5-h5+ Kf3xe3 3.Qh5-c5+ Ke3-f3 4.Qc5-h5+ Kf3-g2 5.Qh5-g4+ Qf2-g3 >6.Qg4-e2+ > -+ (-4.13) Depth: 11/27 00:00:14 4839kN, tb=2776 >1...Kg4-f3 2.Qg5-h5+ Kf3xe3 3.Qh5-c5+ Ke3-f3 4.Qc5-h5+ Kf3-g2 5.Qh5-g4+ Qf2-g3 >6.Qg4-e2+ > -+ (-4.19) Depth: 12/28 00:00:17 6124kN, tb=4307 >1...Kg4-f3 2.Qg5-h5+ Kf3xe3 3.Qh5-c5+ Ke3-f3 4.Qc5-h5+ Kf3-g2 5.Qh5-g4+ Qf2-g3 >6.Qg4-e2+ > -+ (-4.38) Depth: 13/30 00:00:40 14115kN, tb=11538 >1...Kg4-f3 2.Qg5-h5+ Kf3xe3 3.Qh5-c5+ Ke3-f3 4.Qc5-h5+ Kf3-g2 5.Qh5-g4+ Qf2-g3 >6.Qg4-e2+ > -+ (-4.44) Depth: 14/34 00:01:13 25644kN, tb=25364 >1...Kg4-f3 2.Qg5-h5+ Kf3xe3 3.Qh5-c5+ Ke3-f3 4.Qc5-h5+ Kf3-g2 5.Qh5-g4+ Qf2-g3 >6.Qg4-e2+ > -+ (-4.69) Depth: 15/36 00:02:49 59277kN, tb=74801 >1...Kg4-f3-- > -+ (-4.38) Depth: 16/36 00:05:02 106030kN, tb=149103 >1...Kg4-f3 2.Qg5xf4+ Kf3-e2 3.Kf6-e5 Qf2xf4+ 4.e3xf4 e4-e3 5.f4-f5 Ke2-d1 >6.f5-f6 > = (0.00) Depth: 16/36 00:05:07 107824kN, tb=151866 >1...Kg4-h3 > = (0.12) Depth: 16/37 00:05:36 118506kN, tb=171141 > >(Young, 09.04.2000) > >New position >8/8/5K2/6Q1/4ppk1/4P3/5q2/8 b - - 0 1 > >Analysis by Fritz 6: Tablebase depth set to 0 > >1...Kg4-f3 > ³ (-0.56) Depth: 1/1 00:00:00 >1...Kg4-f3 > ³ (-0.56) Depth: 1/1 00:00:00 >1...Kg4-f3 > ³ (-0.56) Depth: 2/2 00:00:00 >1...Kg4-h3 > µ (-0.88) Depth: 2/3 00:00:00 >1...Kg4-h3 2.e3xf4 > µ (-0.88) Depth: 3/6 00:00:00 >1...Kg4-h3 2.e3xf4 > µ (-0.88) Depth: 4/5 00:00:00 >1...Kg4-h3 2.e3xf4 > µ (-0.88) Depth: 5/5 00:00:00 >1...Kg4-h3 2.e3xf4 > µ (-0.88) Depth: 6/6 00:00:00, tb=6 >1...Kg4-h3 2.e3xf4 > µ (-0.88) Depth: 7/15 00:00:00, tb=15 >1...Kg4-h3 2.e3xf4 > µ (-0.88) Depth: 8/19 00:00:00 3kN, tb=68 >1...Kg4-h3 2.e3xf4 e4-e3 3.Qg5-f5+ Kh3-g3 4.Qf5-g5+ Kg3-f3 5.f4-f5 e3-e2 >6.Qg5-h5+ > µ (-0.91) Depth: 9/22 00:00:00 117kN, tb=1240 >1...Kg4-h3 2.e3xf4 e4-e3 3.Kf6-e5 e3-e2 4.Qg5-f5+ Kh3-h2 5.Qf5-h5+ Kh2-g1 >6.Qh5-g4+ > µ (-1.16) Depth: 10/24 00:00:01 379kN, tb=4094 >1...Kg4-f3 > µ (-1.19) Depth: 10/24 00:00:02 505kN, tb=5624 >1...Kg4-f3 2.Qg5-h5+ Kf3xe3 3.Qh5-c5+ Ke3-f3 4.Qc5-h5+ Kf3-g2 5.Qh5-g4+ Qf2-g3 >6.Qg4-e2+ > -+ (-4.28) Depth: 10/24 00:00:09 2460kN, tb=18974 >1...Kg4-f3-- > -+ (-3.97) Depth: 11/27 00:00:10 3003kN, tb=24331 >1...Kg4-f3 2.Qg5xf4+ Kf3-e2 3.Kf6-e5 Qf2xf4+ 4.e3xf4 e4-e3 5.f4-f5 Ke2-d2 >6.f5-f6 > µ (-0.75) Depth: 11/27 00:00:11 3061kN, tb=25305 >1...Kg4-h3 > µ (-0.78) Depth: 11/27 00:00:12 3290kN, tb=28942 >1...Kg4-h3 2.Qg5-f5+ Kh3-h2 3.e3xf4 e4-e3 4.Kf6-e5 Qf2-b2+ 5.Ke5-e6 e3-e2 >6.Qf5-a5 > µ (-1.28) Depth: 11/27 00:00:18 4943kN, tb=43577 >1...Kg4-h3 2.Qg5-f5+ Kh3-h2 3.Qf5-h5+ Kh2-g2 4.Qh5-g5+ Kg2-f1 5.e3xf4 e4-e3 >6.Qg5-h6 > -+ (-1.44) Depth: 12/29 00:00:22 5911kN, tb=56274 >1...Kg4-f3 > -+ (-1.47) Depth: 12/29 00:00:23 6242kN, tb=61537 >1...Kg4-f3-- > µ (-1.16) Depth: 13/22 00:00:24 6274kN, tb=62399 >1...Kg4-f3 2.Qg5xf4+ Kf3-e2 3.Kf6-e5 Qf2xf4+ 4.e3xf4 e4-e3 5.f4-f5 Ke2-d1 > = (0.00) Depth: 13/26 00:00:25 6559kN, tb=67032 >1...Kg4-h3 > = (0.12) Depth: 13/28 00:00:27 7030kN, tb=75803 >1...Kg4-h3 2.Qg5-f5+ Kh3-h2 3.Qf5-h5+ Kh2-g2 4.Qh5-g5+ Kg2-f1 5.e3xf4 e4-e3 >6.Qg5-h6 > -+ (-1.47) Depth: 13/31 00:00:35 9051kN, tb=99962 >1...Kg4-h3! > -+ (-1.78) Depth: 14/33 00:01:12 16737kN, tb=207690 >1...Kg4-h3! 2.Qg5-f5+ Kh3-g2 3.Qf5xe4+ f4-f3 4.Kf6-e5 Qf2-g3+ 5.Ke5-f6 Qg3-d6+ >6.Kf6-g5 > -+ (-2.56) Depth: 14/33 00:01:28 20979kN, tb=261110 > >(Young, St. 09.04.2000) The problem is not the probe depth, but the handling of 5 piece TBs, as with only 3- and 4 piece TBs Fritz6a does play Kh3 from depth 7 at 0 seconds. Ernst. New position 8/8/5K2/6Q1/4ppk1/4P3/5q2/8 b - - 0 1 Analysis by Fritz 6: 1...Kf3 ³ (-0.38) Depth: 1/3 00:00:00 1...Kf3 2.Qxf4+ Ke2 = (-0.19) Depth: 1/5 00:00:00 1...Kf3 2.Qxf4+ Ke2 = (-0.19) Depth: 2/7 00:00:00 1...Kf3 2.Qxf4+ Ke2 3.Kf5 = (-0.19) Depth: 3/9 00:00:00 1...Kh3 = (-0.22) Depth: 3/11 00:00:00 1kN 1...Kh3 2.Qf5+ = (-0.25) Depth: 3/11 00:00:00 1kN 1...Kh3 2.exf4 Qb6+ 3.Kf5 e3 4.Qg4+ Kh2 ³ (-0.34) Depth: 4/14 00:00:00 3kN 1...Kh3 2.Qf5+ Kg2 3.exf4 e3 4.Ke5 ³ (-0.41) Depth: 5/14 00:00:00 8kN 1...Kf3! ³ (-0.44) Depth: 5/14 00:00:00 11kN 1...Kf3! 2.exf4 e3 3.f5 e2 µ (-0.78) Depth: 5/15 00:00:00 15kN 1...Kf3 2.Qxf4+ Ke2 3.Ke5 Qxf4+ 4.exf4 e3 5.f5 ³ (-0.63) Depth: 6/15 00:00:00 24kN 1...Kf3 2.Qxf4+ Ke2 3.Ke5 Qxf4+ 4.exf4 e3 5.f5 Kd2 ³ (-0.56) Depth: 7/18 00:00:00 38kN, tb=3 1...Kh3 ³ (-0.59) Depth: 7/18 00:00:00 57kN, tb=5 1...Kh3 2.exf4 e3 3.Qf5+ Kg3 4.Kg5 e2 5.Qg4+ Kh2 µ (-0.75) Depth: 7/19 00:00:00 79kN, tb=8 1...Kh3 2.exf4 e3 3.Qf5+ Kg3 4.Qg5+ Kf3 5.f5 e2 6.Qh5+ µ (-0.88) Depth: 8/20 00:00:01 137kN, tb=28 1...Kh3 2.exf4 e3 3.Qf5+ Kg3 4.Qg5+ Kf3 5.f5 e2 6.Qh5+ µ (-0.91) Depth: 9/24 00:00:02 291kN, tb=96 1...Kh3 2.exf4 e3 3.Ke5 e2 4.Qf5+ Kh2 5.Qh5+ Kg1 6.Qg4+ µ (-1.16) Depth: 10/26 00:00:04 812kN, tb=384 1...Kh3 2.Qf5+ Kh2 3.exf4 e3 4.Ke5 e2 µ (-1.34) Depth: 11/26 00:00:07 1668kN, tb=956 1...Kh3 2.Qf5+ Kh2 3.Qh5+ Kg2 4.Qg5+ Kf1 5.exf4 e3 6.Qh6 -+ (-1.44) Depth: 12/29 00:00:12 3350kN, tb=2385 1...Kh3 2.Qf5+ Kh2 3.Qh5+ Kg2 4.Qg5+ Kf1 5.exf4 e3 6.Qh6 -+ (-1.47) Depth: 13/31 00:00:21 6445kN, tb=5564 1...Kh3! -+ (-1.78) Depth: 14/34 00:00:38 12178kN, tb=10882 1...Kh3! -+ (-2.09) Depth: 15/35 00:01:20 28383kN, tb=25109 1...Kh3 2.Qf5+ Kh2 3.Qh5+ Kg2 4.Qg5+ Kf1 5.Qb5+ Ke1 6.Qb1+ -+ (-2.25) Depth: 15/36 00:02:26 54195kN, tb=43285 1...Kh3 2.Qf5+ Kh2 3.Qh5+ Kg2 4.exf4 Qxf4+ 5.Ke6 e3 6.Qe2+ -+ (-2.50) Depth: 16/37 00:05:19 121818kN, tb=103732 1...Kh3 2.Qf5+ Kh2 3.Qh5+ Kg2 4.exf4 Qxf4+ 5.Ke6 e3 6.Qe2+ -+ (-2.56) Depth: 17/39 00:14:13 336495kN, tb=257909
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