Author: Mike Hood
Date: 03:01:02 05/05/05
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On May 04, 2005 at 11:16:55, Uri Blass wrote: >On May 04, 2005 at 09:09:25, Robert Hollay wrote: > >> I'd like to download some freeware engines, which are weaker >>by default (say 1200-1600 ELO), with WB or UCI interfaces, but have >>an interesting or "human-like" playing style. >> Yes, there is a plenty of links to free engines on chess sites, >>but I have small bandwith, so cannot download and try out each ... >> >>Thanks in advance for any help or suggestion! >> >>Robert > >Why do you need weak by default? > >It is possible to change the personality of Movei to make it weak. >I guess that if you change the piece square table of Movei to tell it that a >queen is less than a pawn and that knights have negative value it will do the >trick(I never tried it but people who are interested in doing it can do it). > >Uri Uri, the question is "How can I make an engine beatable without making it play stupid?" There are a few answers to this question: 1) Write an engine which has a weak evaluation algorithm, for instance by not giving it much positional information. (I think this is what Robert was looking for). 2) Make slight changes to piece values. For instance, change a Knight's value to 2 (instead of 3) to encourage the computer to make spectacular looking but often unsuccessful sacrifice exchanges. Changing a Queen's value from 9 to less than 1 would be too drastic. 3) Restrict the search depth. This is my personal favourite method. An engine that only searches 5 or less plies often misses tactical combinations and makes very "human" errors.
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