Author: Alessandro Damiani
Date: 11:03:50 08/07/04
Go up one level in this thread
On August 07, 2004 at 13:59:54, Stuart Cracraft wrote: >On August 07, 2004 at 13:54:27, Alessandro Damiani wrote: > >>On August 07, 2004 at 13:00:31, Stuart Cracraft wrote: >> >>>So I heard a lot about SEE from a lot of people >>>and was fortunate enough to receive some good code >>>from Alessandro. I implemented and tested it with >>>many test cases and in all cases it gave the >>>expected return from the exchange ok. >>> >>>Then with some other help I implemented this in >>>the capture search. >>> >>>This program has some things that make SEE() not >>>give a good result, in fact slightly worse (fewer >>>nodes in same time) -- no speedup. >>> >>>1) evaluator is material and pc/sq lookup only >>>2) routine to find attackers/defenders (to give to see) >>> is not much faster or slower than makemv() >>>3) I order all moves partly with MVV/LVA but do not >>> discard directly on that unless the alpha/beta/pvs >>> says to disard/cutoff. >>> >>>With these, the program did not speedup with SEE >>>and slowed down. The program is PVS with null move. >>> >>>So that is the story -- I will leave the code in >>>for a future day and future need. >>> >>>If someone with #1 and #2 got a good speedup from SEE, >>>let me know. I am doing something wrong in that case. >>>Or if you think there is some other way SEE can be used >>>advantageously, let me know. Currently I only have it >>>in the capture search since that's where I heard it had >>>the most effect. >>> >>>Stuart >> >>Attack detection is a key issue. Since I am a Bitboarder I cannot tell you which >>method is best for non-bitboarder. Ed Schröder's SEE is very good for >>non-bitboarder, I think. See http://members.home.nl/matador/chess840.htm. >> >>Alessandro > >I carefully went over that page a couple weeks ago and there >was mention made of "See Static Exchange Evaluator" but no >discussion I could see on Ed's SEE in particular. Then it was here. I read about indexing to a SEE table with index = 16-bit attacker/defender word. Alessandro
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.