Author: José de Jesús García Ruvalcaba
Date: 03:16:37 10/08/01
Go up one level in this thread
On October 07, 2001 at 21:39:52, Robert Hyatt wrote: >On October 07, 2001 at 16:37:27, derrick gatewood wrote: > >>I am trying to get modify crafty to play at a level that is comparable to my own >>strength. I am rated 2055 and I want something that is about 1950-2050. I have >>tried creating a resource file with dumbed down options like Search Depth 5 and >>other things, and I have even tried taking the search depth further down. Can >>anybody help me identify and change the resource options I would need to get >>this thing to play within that range? What exactly is the selectivity option? >>Or even better, if there is some kind of tutorial website that somebody knows I >>would appreciate it very much! Thanks, Derrick > > >Here are the options: > >1. Check the "extension" command in crafty.doc. You can use this to tone >down the search extensions and reduce its tactical acuity. You can set them >to zero, which will definitely weaken the tactical part of the search. > >2. You can tone down (or even disable) the null-move search. You can >try sel=2/3 (the default) then sel=2/2, sel=1/1, and finally sel=0/0 which >will turn null-move off. This will further reduce the search depth and overall >strength. > >3. Check the "evaluation" command and start cutting the "weights" down. They >default to 100, so reducing these reduces the influence of "knowledge" in the >search. IE reducing the pawn evaluation weight to 25 will reduce the effective- >ness of pawn structure analysis to 1/4 of its original "smarts". > And if you want a really weak crafty, set these evaluation weights to ridiculous values. Something like either 5000 or -5000 for ksafety, for example. José. >It should be possible to play with these to create a program that is tactically >and positionally as strong or as weak as you would want. It would probably feel >wrong to have a positionally smart but tactically stupid program (ie extensions >zero, positional stuff at default levels) or vice-versa... But there is a _lot_ >of room for experimentation. If you find some settings you like, email them to >me and I will be happy to add a "personality" that uses those settings so it >will be easy for others to try them out...
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