Author: Robert Hyatt
Date: 09:58:48 06/02/98
Go up one level in this thread
On June 02, 1998 at 10:47:02, Ulrich Tuerke wrote: >On June 02, 1998 at 10:12:30, Robert Hyatt wrote: > >>On June 02, 1998 at 02:01:43, Komputer Korner wrote: >> >>>On June 02, 1998 at 00:51:08, Havergal Brian wrote: >>> >>>>This is part of my Winboard.ini file. So far I've had no >>>>crashes/problems. Just put this in the appropriate spot with >>>>the changes you want. >>>> >>>>/cp >>>>/mg 50 >>>>/sgf wcraftyvscomet >>>>/fcp="comet-wb.exe" >>>>/scp="wcrafty-12_6 xboard" >>> >>>Since I turned pondering off, no more crashes but I still have the >>>problem of Crafty corrupting it's book after a long natch of 40 games. I >>>have to rebuild it's book each time. There is definitely something >>>broken with Crafty's book code because in my latest match Crafty was out >>>of book after 1.e4e5 2.Nf3 !!!!!! >>>-- >>>Kpmputer Korner >> >> >>lets back this trolley up a bit. So far as I can tell, there is >>*nothing* >>wrong with crafty's book code. It is *impossible* for it to corrupt the >>book, because it never adds anything to the book at all. If it were >>doing >>this, we'd be seeing *lots* of problems on the servers where we play 500 >>games >>a day on each program... The problem most likely lies somewhere in your >>setup, whether you have flakey memory, or something else, is unknown. >>But >>I played one 330 game match yesterday crafty vs crafty with *zero* >>problems >>of any kind... >> >>Be careful of "there is definitely something broken with crafty's book >>code." as the evidence doesn't support that when everyone else seems to >>be able to play crafty vs xyz with no problems... > >I have had a similar (the same ?) effect when playing Crafty with >winboard. I think that there is nothing wrong with its book and book >code. May be, KK has installed the small Crafty book as I did. With the >default choice for "book random", Crafty only plays lines the frequency >of which are higher than some threshold value (Bob knows better). >Apparently, the desired frequencies can hardly be reached in the small >book. However if you set "book random 5" instead of the default >randomness for instance, then the threshold is chosen lower and >variations will be found. >May be KK has the same effect. I had explained this danger to KK... "small book" means no useful frequency data to choose moves. It is more than possible that the book is so narrow that after a few games it has learned that moves are bad. This can be verified by adding "show book" to the crafty.rc file, and then starting crafty in a dos window (in the right directory) and then trying the opening moves in question. It will display *every* book move it finds, and will show which are flagged as unplayable "?" due to bad learned results, no wins, or not played enough to "trust"...
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