Author: Robert Hyatt
Date: 13:52:03 02/21/00
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On February 21, 2000 at 13:33:58, Christophe Theron wrote: >On February 21, 2000 at 12:16:49, Tom Kerrigan wrote: > >>On February 21, 2000 at 11:37:52, Mark Taylor wrote: >> >>>An idea I had was to have a small incrmental value subtracted from the eval, >>>this small increment getting larger the deeper into the tree search the eval was >>>returned from. I had already done this for the values WON & LOST, but I >> >>This is a good idea. However, most chess programs have transposition tables. The >>ideas are not compatible, because ttables assume that a position's score is >>constant. You will probably want to have ttables instead of your penalty, >>because once in a while there are huge benefits to having a ttable. >> >>>What I did in the end I made the first search iteration look at positional eval >>>& material eval, then subsequent iterations looked at material eval only - but >>>this was really a cop out. >> >>Yeah, I think this just confuses things. A long time ago I think there was a >>program that ran on two CPUs. One CPU ran the regular evaluation function and >>one was material-only. They checked each other. But programs these days get >>along fine without material-only eval. >> >>-Tom > > >The very old program Tech (I think the author was Gillogly, correct my spelling >please, it was back in 1960) did this, but on only one processor I think. > >It played rather well, but was seriously handicaped by lack of deep positional >understanding. > > > Christophe No. Tech was a 1970+ program. The program that did two searches was called "Phoenix" by Jonathan Schaeffer. He ran a normal search with several workstations in parallel, and a "minix" search using several more workstations in parallel. Minix searched deeper looking only for tactical refutations of the moves being considered by the normal search. Tech was a very fast, very "dumb" type technology approach, which is where its name came from (tech). Jim occasionally posts on r.g.c.c and can be reached there.
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