Author: Daniel Clausen
Date: 08:29:18 11/13/03
Go up one level in this thread
On November 13, 2003 at 11:10:53, Uri Blass wrote: >On November 13, 2003 at 10:53:22, Daniel Clausen wrote: > >>On November 13, 2003 at 10:13:34, Uri Blass wrote: >> >>>On November 13, 2003 at 09:44:22, Daniel Clausen wrote: >>> >>>>On November 12, 2003 at 18:40:32, Peter Kappler wrote: >>>> >>>>[snip] >>>> >>>>>>I get an average of better than 90%. It takes tuning. Work on killers and >>>>>>history pays off. Make sure you search bad captures before other moves also. >>>>>>Taking capture out of killers gave me a boost also. >>>>>> >>>>> >>>>>Hmmm, I think I do bad captures at the end, and as I recall it was a clear win. >>>> >>>>IIRC, for most people trying bad captures at the end was better with SEE, but >>>>worse with MVV/LVA. >>>> >>>>Sargon >>> >>>How do you know that a capture is bad with MVV/LVA? >> >>When someone uses SEE, a capture is bad when the SEE-value for it is negative. >>When someone uses MVV/LVA, a capture is bad when the MVV/LVA-value for it is >>negative. >> >>It's that simple. :) >> >>Sargon > >It is not so simple. > >By this definition every pawn capture by knight,bishop,rook,queen,king is a bad >capture. > >It does not make sense so it does not make sense even to try to put it after non >captures. > >You can have a function to detect part of the captures as bad captures and also >use MVV/LVA for the captures that you do not detect as bad. > >The function that detect bad captures is not SEE because SEE gives you the >expected value of the capture and not only the information if the capture is >good or bad. > >SEE can order QxN before QxQ when both are good captures when the special >function does not do it. > >In that case the question if to put bad captures before history moves or not to >do it is dependent on the definition of bad capture. > >Uri I retract everything I said in this thread. :) I still had the (false) idea in my head that to calculate the score of a capture in MVV/LVA, you subtract the value of your piece from the value of the captured piece, which leads to the problems you pointed above. But I guess MVV/LVA just means that the order of captures to try is PxQ, B/NxQ, RxQ, QxQ, KxQ, PxR, B/NxR, RxR, QxR, KxR etc With this definition there's simply no way to distinguish between good and bad captures. Sargon
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.