Author: Robert Hyatt
Date: 14:58:27 02/05/99
Go up one level in this thread
On February 05, 1999 at 00:13:59, James B. Shearer wrote: >On January 31, 1999 at 10:43:10, Robert Hyatt wrote: > >>On January 30, 1999 at 23:54:15, James B. Shearer wrote: >> >>> I was playing Fitter on ICC and was surprised when it let me escape with >>>a draw in a K and P endgame. I checked the key position afterwards with crafty >>>16.3 (on a 233 k6 PC). Crafty 16.3 takes 2 hours to find the winning move, h4, >>>at ply 16 (see log below). On the other hand crafty 15.15 finds h4 in 8 seconds >>>at ply 10. Fritz 4 also finds h4 in a few seconds. Looks like you may have >>>broken something. >>> James B. Shearer >> >> >>you must have something broken on your machine, first. I ran this on my >>PII/300 notebook, and get to ply 16 in a minute, not hours. Is your machine >>swapping/paging a lot? It takes me to depth=16 to fail high on h4, takes 2:00 >>on my notebook, and 25 seconds on my quad xeon... I couldn't begin to explain >>why it would take hours to get to ply=16 there... I am at ply=17 failing high >>again after only 3 minutes on my notebook. > > I think my machine is ok. I ran the position again using the annotate >command for 7200 seconds (2 hours) and the node rate stayed at 60000 same as for >a 60 second search so I don't think swapping/paging is the problem. See log >below. > James B. Shearer >hash table memory = 12M bytes. >pawn hash table memory = 2M bytes. >EGTB access enabled >using tbpath=./TB >0 piece tablebase files found >pondering disabled. >book learning disabled >result learning disabled >position learning disabled >noise level set to 0. > > >Crafty v16.3 > >White(1): annotate fitkp.pgn b 40-40 -1 7200 > ><snip moves> > >Black(40): g5 > > Searching all legal moves.---------------------------------- >end-game phase > clearing hash tables > time surplus 0.00 time limit 120:00 (120:00) > depth time score variation (1) > 1 0.00 1.94 40. ... g5 > 1 0.01 1.96 40. ... Kg5 > 1-> 0.02 1.96 40. ... Kg5 > 2 0.03 -- 40. ... Kg5 > 2 0.03 0.00 40. ... Kg5 > 2 0.03 ++ 40. ... h4!! > 2 0.04 1.57 40. ... h4 41. gxh4 Kf4 > 2 0.05 1.89 40. ... g5 41. Ke3 > 2-> 0.06 1.89 40. ... g5 41. Ke3 > 3 0.06 1.69 40. ... g5 41. Ke3 Kg6 > 3-> 0.07 1.69 40. ... g5 41. Ke3 Kg6 > 4 0.08 1.81 40. ... g5 41. Ke3 g4 42. h4 > 4-> 0.10 1.81 40. ... g5 41. Ke3 g4 42. h4 > 5 0.13 1.87 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 > 5-> 0.15 1.87 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 > 6 0.18 1.61 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Ke3 > 6-> 0.20 1.61 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Ke3 > 7 0.32 1.77 40. ... g5 41. Ke3 g4 42. h4 Kg6 43. > Kf4 Kf7 > 7-> 0.35 1.77 40. ... g5 41. Ke3 g4 42. h4 Kg6 43. > Kf4 Kf7 > 8 0.73 1.81 40. ... g5 41. Ke3 Kg6 42. Ke2 g4 43. > h4 Kf5 44. Ke3 > 8-> 0.77 1.81 40. ... g5 41. Ke3 Kg6 42. Ke2 g4 43. > h4 Kf5 44. Ke3 > 9 1.48 1.71 40. ... g5 41. Ke3 Kg6 42. Ke2 g4 43. > h4 Kf7 44. Ke3 Ke7 > 9-> 1.53 1.71 40. ... g5 41. Ke3 Kg6 42. Ke2 g4 43. > h4 Kf7 44. Ke3 Ke7 > 10 2.49 1.71 40. ... g5 41. Ke3 Kg6 42. Kf2 g4 43. > h4 Kf7 44. Ke3 Ke7 45. b4 <HT> > 10-> 2.57 1.71 40. ... g5 41. Ke3 Kg6 42. Kf2 g4 43. > h4 Kf7 44. Ke3 Ke7 45. b4 <HT> > 11 5.69 1.71 40. ... g5 41. Ke3 Kg6 42. Kf2 g4 43. > h4 Kf7 44. Ke2 Ke7 45. Ke3 Kd7 > 11-> 5.81 1.71 40. ... g5 41. Ke3 Kg6 42. Kf2 g4 43. > h4 Kf7 44. Ke2 Ke7 45. Ke3 Kd7 > 12 9.15 1.71 40. ... g5 41. Ke3 Kg6 42. Kf2 g4 43. > h4 Kf7 44. Ke2 Ke7 45. Ke3 Kd7 46. > b4 > 12-> 9.89 1.71 40. ... g5 41. Ke3 Kg6 42. Kf2 g4 43. > h4 Kf7 44. Ke2 Ke7 45. Ke3 Kd7 46. > b4 > 13 26.26 1.71 40. ... g5 41. Ke3 Kg6 42. Kf2 g4 43. > h4 Kf7 44. Ke2 Ke7 45. Kf2 Kd7 46. > Ke3 Kc6 > 13-> 28.44 1.71 40. ... g5 41. Ke3 Kg6 42. Kf2 g4 43. > h4 Kf7 44. Ke2 Ke7 45. Kf2 Kd7 46. > Ke3 Kc6 > 14 3:10 1.72 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Kf2 Ke7 45. Ke2 Kd7 46. > Kf2 Kd8 47. Ke3 Ke7 48. c4 > 14-> 3:14 1.72 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Kf2 Ke7 45. Ke2 Kd7 46. > Kf2 Kd8 47. Ke3 Ke7 48. c4 > 15 4:57 1.71 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Kf2 Ke7 45. Ke2 Kd7 46. > Kf2 Kd8 47. Ke3 Kc7 48. Kf2 Kc6 49. > Ke3 > 15-> 5:14 1.71 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Kf2 Ke7 45. Ke2 Kd7 46. > Kf2 Kd8 47. Ke3 Kc7 48. Kf2 Kc6 49. > Ke3 > 16 11:46 1.71 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Kf2 Ke7 45. Ke2 Kd7 46. > Kf2 Kd8 47. Ke3 Kc7 48. Ke2 Kc6 <HT> > 16-> 12:39 1.71 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Kf2 Ke7 45. Ke2 Kd7 46. > Kf2 Kd8 47. Ke3 Kc7 48. Ke2 Kc6 <HT> > 17 53:37 1.71 40. ... g5 41. Ke3 h4 42. g4+ Kg6 43. > Ke2 Kf7 44. Kf2 Ke7 45. Ke2 Kd7 46. > Kf2 Kd8 47. Ke3 Kc7 48. Ke2 Kc6 49. > Ke3 Kd7 > time=120:00 cpu=99% mat=0 n=436256725 fh=4% nps=60589 > ext-> checks=49824007 recaps=1196664 pawns=18327198 1rep=14431267 > predicted=0 nodes=436256725 evals=82091710 > endgame tablebase-> probes done=0 successful=0 maxd=32 > hashing-> trans/ref=32% pawn=1% used=w99% b99% >White(41): quit >execution complete. this says something is wrong. pawn=1% means you are running about 1/2 the speed you normally should. Check the size of hashp as it is either bogus or something else is broken. fh=4% is impossible. That means that in only 4% of the nodes where the search fails high it fails high on the first move. The lowest value I have ever seen here is 88%, and it is normally above 90%. Is this a stock crafty, or one you compiled yourself? IE it is possible that the compiler is breaking something.
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