Author: Sune Larsson
Date: 04:34:42 03/18/01
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On March 17, 2001 at 21:08:37, Robert Hyatt wrote: >On March 17, 2001 at 12:21:45, Sune Larsson wrote: > >> >> 8/2R5/k7/P7/2PK4/8/1P2r3/8 w - - 0 1 >> >> >> This position was sent to me just two hours ago (thanks!) >> White has a won position but must avoid the last trap, >> which is 1.b4?? and a draw. The programs I have tried >> sees this but in different speed. (PIII 800) >> >> Deep Fritz 0 sec >> Nimzo 8 2 " >> Hiarcs 7.32 2 " >> Crafty 18.03 20 " >> Fritz 5.32 48 " >> >> >> Test: 1) Does your program realize that 1.b4?? is a draw? >> 2) How much time needed? >> >> Sune > > >I am trying to understand your question. > >On my PIII/750 notebook, crafty changes from b4 to Kc3 after >4 seconds... and never considers b4 again... > >If I play b4 myself, it takes .8 seconds to get a score >of 0.00... > >Not sure why yours took 20 seconds to see that... Here is the output from Crafty 18.03, CB native, PIII 800, 128 MB Hash. Infinite analyse mode: Ny ställning 8/2R5/k7/P7/2PK4/8/1P2r3/8 w - - 0 1 Analysis by Crafty 18.03: 1.b4 +- (4.88) Djup: 1/2 00:00:01 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 +- (4.78) Djup: 5/9 00:00:01 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 +- (4.78) Djup: 5/9 00:00:01 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 +- (4.78) Djup: 5/9 00:00:01 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 +- (4.78) Djup: 5/9 00:00:01 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 Td4+ 5.Ke6 +- (4.58) Djup: 6/13 00:00:01 8kN, tb=18 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 Td4+ 5.Ke6 Td6+ +- (4.58) Djup: 7/14 00:00:01 15kN, tb=21 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 Td4+ 5.Ke6 Te4+ 6.Kd7 Td4+ 7.Ke7 Td1 +- (4.48) Djup: 8/16 00:00:01 31kN, tb=41 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 Td4+ 5.Ke6 Te4+ 6.Kd7 Td4+ 7.Ke8 Te4+ 8.Kd8 +- (4.38) Djup: 9/17 00:00:01 66kN, tb=129 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 Td4+ 5.Ke6 Te4+ 6.Kf6 Te6+ 7.Kg5 Te5+ 8.Kf4 Te4+ 9.Kf5 Td4 +- (4.38) Djup: 10/19 00:00:02 137kN, tb=270 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 Td4+ 5.Ke6 Te4+ 6.Kf6 Tf4+ 7.Kg6 Tf6+ 8.Kh5 Tf5+ 9.Kh6 Tf6+ 10.Kg5 Te6 +- (4.18) Djup: 11/21 00:00:03 347kN, tb=693 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 Td4+ 5.Ke6 Te4+ 6.Kf6 Tf4+ 7.Kg6 Tg4+ 8.Kh6 Tg6+ 9.Kh5 Tg5+ 10.Kh4 Tg4+ 11.Kh3 Tf4 +- (4.00) Djup: 12/25 00:00:05 765kN, tb=1686 1.b4 Te4+ 2.Kd5 Td4+ 3.Ke5 Te4+ 4.Kd6 Td4+ 5.Ke6 Te4+ 6.Kf6 Tf4+ 7.Kg6 Tg4+ 8.Kh6 Tg6+ 9.Kh5 Tg5+ 10.Kh4 Tg4+ 11.Kh3 Tg3+ 12.Kh2 Tf3 +- (4.00) Djup: 13/25 00:00:12 2668kN, tb=5042 1.b4 Te4+ 2.Kc5 Txc4+ 3.Kd6 Txb4 = (0.01) Djup: 14/29 00:00:26 6649kN, tb=13601 1.Kc3 ² (0.41) Djup: 14/29 00:00:28 7605kN, tb=14685 (Larsson, KIL 18.03.2001)
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