Author: Enrique Irazoqui
Date: 07:39:53 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? On a dual P933, Crafty 18.6 drops b4 after 1 second. Maybe Sune's Crafty is slowed down by tablebase access or memory swapping? New position 8/2R5/k7/P7/2PK4/8/1P2r3/8 w - - 0 1 Analysis by Crafty 18.06: 1.b4 +- (4.88) Depth: 1/4 00:00:00 1.b4 Rd2+ 2.Kc3 +- (4.88) Depth: 2/4 00:00:00 1.b4 Rd2+ 2.Kc3 Re2 +- (4.88) Depth: 3/5 00:00:00 1.b4 Re4+ 2.Kd5 Rd4+ 3.Ke6 Rd3 +- (4.58) Depth: 4/7 00:00:00 1.b4 Re4+ 2.Kd5 Rd4+ 3.Ke5 Re4+ 4.Kd6 +- (4.78) Depth: 5/8 00:00:00 1.b4 Re4+ 2.Kd5 Rd4+ 3.Ke5 Re4+ 4.Kd6 Rd4+ 5.Ke6 +- (4.58) Depth: 6/11 00:00:00 8kN, tb=36 1.b4 Re4+ 2.Kd5 Rd4+ 3.Ke5 Re4+ 4.Kd6 Rd4+ 5.Ke6 Rd6+ +- (4.58) Depth: 7/12 00:00:00 15kN, tb=42 1.b4 Re4+ 2.Kd5 Rd4+ 3.Ke5 Re4+ 4.Kd6 Rd4+ 5.Ke6 Re4+ 6.Kd7 Rd4+ 7.Ke7 Rd3 +- (4.48) Depth: 8/12 00:00:00 31kN, tb=95 1.b4 Re4+ 2.Kd5 Rd4+ 3.Ke5 Re4+ 4.Kd6 Rd4+ 5.Ke6 Re4+ 6.Kd7 Rd4+ 7.Ke8 Re4+ 8.Kd8 +- (4.38) Depth: 9/16 00:00:00 69kN, tb=214 1.b4 Re4+ 2.Kd5 Rd4+ 3.Ke5 Re4+ 4.Kd6 Rd4+ 5.Ke6 Re4+ 6.Kf6 Re6+ 7.Kf5 Re5+ 8.Kf4 Re4+ 9.Kf3 Rd4 +- (4.38) Depth: 10/18 00:00:00 149kN, tb=538 1.b4 Re4+ 2.Kd5 Rd4+ 3.Ke5 Re4+ 4.Kd6 Rd4+ 5.Ke6 Re4+ 6.Kf6 Re6+ 7.Kf5 Re5+ 8.Kf4 Re4+ 9.Kf3 Re3+ 10.Kf2 Rd3 +- (4.38) Depth: 11/21 00:00:00 364kN, tb=1280 1.b4 Re4+ 2.Kc5 Rxc4+ 3.Kd6 Rxb4 = (0.01) Depth: 12/22 00:00:01 1058kN, tb=2961 1.b3 ² (0.41) Depth: 12/22 00:00:01 1277kN, tb=3483 1.b3 Kxa5 2.c5 Re1 3.Ra7+ Kb5 4.Rb7+ Kc6 5.Rb6+ Kc7 6.Kd5 Rc1 7.b4 Rd1+ 8.Kc4 Kd7 +- (3.80) Depth: 12/22 00:00:06 6643kN, tb=11267 1.b3 Kxa5 2.c5 Re1 3.Ra7+ Kb5 4.Rb7+ Kc6 5.Rb6+ Kc7 6.Rf6 Rc1 7.c6 Rc2 8.Re6 Rf2 +- (3.99) Depth: 13/24 00:00:09 10129kN, tb=21357 1.b3 Kxa5 2.c5 Re1 3.Ra7+ Kb5 4.Rb7+ Kc6 5.Rb6+ Kc7 6.Rf6 Rb1 7.Kc4 Re1 8.c6 Re4+ +- (4.00) Depth: 14/24 00:00:16 18114kN, tb=40961 1.Kc3 Kxa5 2.b4+ Kb6 3.Rc8 Re6 4.b5 Ka5 5.Ra8+ Kb6 6.Kb4 Re4 7.Ra6+ Kc7 8.b6+ Kb7 9.Kb5 Rxc4 10.Kxc4 Kxa6 +- (4.08) Depth: 14/24 00:00:23 26190kN, tb=45265 1.Kc3 Kxa5 2.b4+ Kb6 3.Rc8 Re1 4.c5+ Kb5 5.Rb8+ Kc6 6.Rb6+ Kc7 7.Rf6 Rc1+ 8.Kd4 Rb1 9.Kc4 Rc1+ 10.Kb5 Kd7 11.c6+ Kc7 +- (4.20) Depth: 15/24 00:00:37 41136kN, tb=77183 (Irazoqui, Cadaqués 18.03.2001)
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