Author: Komputer Korner
Date: 14:15:04 06/02/98
Go up one level in this thread
On June 02, 1998 at 12:58:48, Robert Hyatt wrote: >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"... What this means then that no matter how large the book is, eventually ( it may take a very long time for this to happen) Crafty will not trust any book moves and will think on it's own from the beginning. I don't like this way of learning. Much better would be learning by adding to its book the way that M-chess and 99% of humans do it.
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