Author: Sune Larsson
Date: 08:38:31 03/18/01
Go up one level in this thread
On March 18, 2001 at 10:16:04, Robert Hyatt wrote: >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? Hm... you're absolutely right, something was wrong here. I remember that I made a fresh reboot, then checked the taskinfo, which showed about 99% idle, then loaded Crafty with 128 MB hash. Hm... maybe that was too much at that particular moment. Nothing else was running at the same time. Maybe memory swapping, though I have 256 MB. Anyway, a new check showed 2 sec - 765kN and 5 sec - 2657 kN, much better figures. Strange is that Crafty 18.03 seems to reach 1.Kc3 faster in Deep Fritz GUI than Fritz6 GUI... In DF 1.Kc3 was chosen after 4 sec with 2135 kN. Much better. Have to be careful with these things... ;) Thanks Sune
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