Author: Andrew Dados
Date: 17:28:50 11/22/00
Go up one level in this thread
On November 22, 2000 at 14:06:22, Robert Hyatt wrote: >On November 22, 2000 at 12:32:47, Bruce Moreland wrote: > >>On November 22, 2000 at 03:55:13, Jeremiah Penery wrote: >> >>>On November 22, 2000 at 00:02:34, Bruce Moreland wrote: >>> >>>>On November 21, 2000 at 20:24:31, Jeremiah Penery wrote: >>>> >>>>>On November 21, 2000 at 20:11:10, Bruce Moreland wrote: >>>>> >>>>>>What does Crafty think of the Reti study: >>>>>> >>>>>>[D]7K/8/k1P5/7p/8/8/8/8 w - - 0 1 >>>>>> >>>>>>White to move draws. I might have this slightly wrong, because I'm constructing >>>>>>it from memory. >>>>>> >>>>>>bruce >>>>> >>>>>I get a drawscore at ply 9 from Crafty in this position. >>>>> >>>>>This is the last line I got: >>>>> >>>>>22-> 1:01 -0.50 1. Kg7 Kb6 2. Kf6 Kxc6 3. Kg5 h4 4. >>>>> Kxh4 Kc7 5. Kh5 Kb6 6. Kh6 Ka5 7. Kg6 >>>>> Kb6 8. Kh5 Ka5 9. Kh6 Kb6 10. Kg6 Ka5 >>>>> 11. Kh5 Kb6 >>>> >>>>What interests me would be the scores prior to that ply, where Crafty things >>>>white is going to hit a home run. >>>> >>>>bruce >> >>> 7 0.19 -0.50 1. c7 Kb7 2. c8=Q+ Kxc8 3. Kh7 Kb7 >>> 4. Kh6 Kc6 5. Kxh5 >>> 7-> 0.21 -0.50 1. c7 Kb7 2. c8=Q+ Kxc8 3. Kh7 Kb7 >>> 4. Kh6 Kc6 5. Kxh5 >> >>>Crafty never thinks white is winning in this position. >> >>It should think black is winning, because black's pawn can't be stopped, but >>white's can. I snipped out a lot of the other lines here, but does anyone else >>think that the line I kept is completely ridiculous? >> >>Bob, what the heck is crafty doing there? >> >>bruce > >There are several possible issues here. My PV may well be silly on the end. >When I get a hash hit, with an EXACT score, the PV is obviously cut short at >that point. Later, I try to probe the hash table to add more moves to the >end. And on occasion, those moves might not make any sense, and might not >even be part of the set of moves that leads to the score it gave... > >Here is a non-egtb output from crafty (400mhz machine, one cpu): > > time surplus 0.00 time limit 30.00 (3:00) > nss depth time score variation (1) > 1 0.00 -3.50 1. Kg8 > 1-> 0.00 -3.50 1. Kg8 > 2 0.00 -- 1. Kg8 > 2 0.00 -3.91 1. Kg8 h4 > 2 0.00 ++ 1. c7!! > 2 0.00 0.00 1. c7 Kb7 2. c8=Q+ Kxc8 [snip] Bob.. how can you justify zero score here...?
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.