Author: Robert Hyatt
Date: 19:04:23 08/11/01
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On August 11, 2001 at 09:52:48, John Hatcher wrote: >This problem has me puzzled. (I'm easily puzzled.) > >I was analyzing this position from the 8th round of the Montreal International >-IM Irina Krush was playing Black. > >Celeron 333mhz, 48mb hash > >ChessTiger 14 (Chessbase) GUI >Most important (but not all) 5 man tablebases > >Engines used in analysis (all with tablebase support): >Chess Tiger 14 >Crafty 18.10 (Chessbase version) >Little Goliath 1.5 (Chessbase version) >Fritz 6 > >[D]8/5p2/3k3p/7Q/P7/6PK/2pq4/8 w - - 0 1 > >When I used Little Goliath 1.5 to anaylze this position it started accessing the >tablebases instantly, and accessed them throughout its analysis. > >Now, here's what puzzles me - when I analyzed the position with Chess Tiger, >Crafty 18.10, and Fritz 6, none of the engine access the tablebases during their >analysis. > >All four of these engines usually access and use tablebases without a problem. >Is there something about this position and the engines which results in only >Little Goliath using tablebases when analyzing it? > >That Crafty is not using the tablebases really has me puzzled. I thought Crafty >was capable of using tablebases even if the tablebase set was incomplete (unlike >some engines). > >I don't get it. Any ideas? > >JOHN Lots of things can cause this (in Crafty). 1. look at the log.nnn file to see if it reports "5 piece tablebase files found". If not, you have a problem with your tbpath setting. 2. if it reports seeing them, it is using them. The LRU caching algorithm is very efficient. It is possible that it can probe like crazy without doing any disk I/O. Again, the log.nnn file will show "probes done" and if that is non-zero, you are doing OK. If you see no probes done and/or no probes successful, again you have a tbpath problem most likely. Or a filename problem with the TB files.
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