Author: Chessfun
Date: 06:59:31 10/26/01
Go up one level in this thread
On October 26, 2001 at 08:21:04, Uri Blass wrote: >[D]8/5P2/4K2k/8/1P2p2p/p7/6R1/5r2 b - - 0 55 bm h3 > >Fritz7 played 56...e3 and lost against Shredder5.32 when 56...h3 is enough for a >draw. > >I believe that Fritz7 lost because it overevaluated passed pawns and evaluated >it's passed pawns as more than the white rook. > >Deep Fritz also needs some minutes to fail low on 56...e3 and I am interested to >know if Deep Fritz is faster or slower than Fritz7 in finding 56...h3 > >Deep Fritz(PIII850,64 mbytes hash with all the 4 piece tablebases and part of >the 5 piece tablebases including KR vs KPP) needs depth 19 and 7 minutes and 20 >seconds to fail low on 56...e3 > >It solves the fail low after 9 minutes and 38 seconds with score of 3.81 for >white and after 16:28 it changes it's mind to Rf4(probably another losing move). > >I may try bigger hash because big hash tables may be important in endgames but I >doubt if it is going to help here. > >There are other programs that need 0 seconds to find 56...h3. > >Uri Fritz 6 also wants to play the losing 56....e3 On a Thunderbird 1.4 ghz, 64 mb hash all 5 personbases. New position 8/5P2/4K2k/8/1P2p2p/p7/6R1/5r2 b - - 0 1 Analysis by Fritz 6: 55...Rxf7-- ³ (-0.28) Depth: 1/3 00:00:00 55...Rxf7-- 56.Kxf7 ² (0.59) Depth: 1/3 00:00:00 55...h3! = (0.12) Depth: 1/5 00:00:00 55...h3! -+ (-1.59) Depth: 1/5 00:00:00 55...h3 56.Rh2 -+ (-1.53) Depth: 2/6 00:00:00 55...h3-- µ (-1.19) Depth: 3/8 00:00:00 55...h3-- 56.Rh2 Rf3 57.f8Q+ Rxf8 58.Rxh3+ Kg5 59.Rxa3 = (-0.25) Depth: 3/9 00:00:00 55...Kh5! ³ (-0.28) Depth: 3/10 00:00:00 1kN 55...Kh5! 56.Re2 Rf4 µ (-1.13) Depth: 3/10 00:00:00 1kN 55...Kh5-- µ (-0.81) Depth: 4/9 00:00:00 1kN 55...Kh5-- µ (-0.81) Depth: 4/11 00:00:00 1kN 55...Kh5-- ³ (-0.38) Depth: 5/11 00:00:00 2kN 55...Kh5-- 56.Ke7 h3 57.Ra2 Kg6 58.f8Q Rxf8 59.Kxf8 = (-0.16) Depth: 5/12 00:00:00 4kN 55...Kh5 56.Ra2 Kg6 57.Rg2+ = (-0.06) Depth: 6/14 00:00:00 9kN 55...Rf3! = (-0.09) Depth: 6/14 00:00:00 12kN 55...Rf3 56.b5 Kh5 57.Re2 Kg6 58.Rxe4 = (0.00) Depth: 7/17 00:00:00 31kN 55...h3! = (-0.03) Depth: 7/17 00:00:00 43kN 55...h3! 56.Ra2 Kg7 57.Rxa3 Rf6+ 58.Ke5 Kxf7 59.Rxh3 Re6+ 60.Kd5 = (-0.13) Depth: 7/17 00:00:00 48kN 55...h3 56.Rg1 Rf2 57.Rh1 Kg7 58.Rxh3 Rxf7 = (-0.03) Depth: 8/17 00:00:00 71kN 55...e3! = (-0.06) Depth: 8/17 00:00:00 103kN 55...e3! 56.b5 h3 57.Re2 = (-0.09) Depth: 8/19 00:00:00 116kN 55...e3 56.Rh2 Kh5 57.Re2 Rf3 58.Ra2 = (-0.13) Depth: 9/19 00:00:00 213kN 55...e3 56.Rh2 Kg6 57.Rg2+ Kh5 58.Rh2 Rf4 59.Ra2 h3 60.Rxa3 = (-0.13) Depth: 10/21 00:00:00 372kN 55...e3 56.Rh2 Kg6 57.Rg2+ Kh5 58.Rh2 Rf4 59.b5 Kg6 60.Rg2+ = (-0.09) Depth: 11/24 00:00:00 621kN, tb=3 55...e3 56.Rh2 Kg6 57.Rg2+ Kh5 58.Rh2 Rf3 59.b5 Kg6 60.Rg2+ = (-0.09) Depth: 12/24 00:00:01 1304kN, tb=42 55...e3 56.Rh2 a2 57.Rxa2 h3 58.Re2 Kg7 59.Rxe3 Rf6+ 60.Kd5 ³ (-0.28) Depth: 13/28 00:00:03 2618kN, tb=142 55...e3 56.Rh2 a2 57.Rxa2 h3 58.Re2 Kg7 59.Rxe3 Rf6+ 60.Kd5 ³ (-0.28) Depth: 14/32 00:00:05 4683kN, tb=349 55...e3 56.Rh2 a2 57.Rxa2 h3 58.Re2 Kg7 59.Rxe3 Rf6+ 60.Kd5 = (-0.19) Depth: 15/31 00:00:14 9726kN, tb=1053 55...e3 56.Rh2 a2 57.Rxa2 h3 58.Re2 Kg7 59.Rxe3 Rf6+ 60.Ke5 = (-0.03) Depth: 16/32 00:00:45 21992kN, tb=2802 55...e3 56.Rh2 Kg7 57.Rg2+ Kh7 58.Rh2 a2 59.Rxa2 h3 60.Re2 = (-0.16) Depth: 17/35 00:02:43 70515kN, tb=10466
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