Author: Uri Blass
Date: 08:52:59 03/18/01
Go up one level in this thread
On March 18, 2001 at 11:38:31, Sune Larsson wrote: >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 Interesting to know. I wonder if other engines like Junior or Hiarcs can also become better under Deep Fritz GUI. Can chessbase give an explanation for the reason for the difference?(I thought that the engine should get the same result under different GUI's) Uri
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.