Author: Robert Hyatt
Date: 07:16:04 03/18/01
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On March 18, 2001 at 07:34:42, Sune Larsson wrote: >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) Something is odd there. ie above, 3 seconds, 347K nodes. That doesn't look like a PIII/800 speed. My PIII/750 searches at about 500K nodes per second, rather than your 115K. Is something else running at the same time?
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