Author: Matthew White
Date: 21:40:38 07/02/03
Go up one level in this thread
On July 01, 2003 at 14:10:44, Robert Hyatt wrote: >On July 01, 2003 at 05:41:31, Graham Laight wrote: > >>When a GM is contemplating a move, he doesn't say to himself, "Hmmmmm. I would >>give the resulting position a score of 1.723". > >Actually, he _does_. > >"Nb5 drops a pawn but has compensation in the attack on the enemy king." > >"Nf3 maintains material equality but my position is quite cramped." > >etc. > >I think that a human does _far_ more than just say "this is equal, winning >or losing." I know I do. And the GM players I talk to seem to do this as >well. While they might not do millipawns (or even centipawns) they certainly >do fractions of a pawn in positional compensation. > Definitely. If further evidence is needed, one can pick up a copy of any large opening reference (ECO, NCO, MCO, etc.). Inside, positions are labeled "slight advantage to white," "white is winning," "position is unclear," "with equal chances," "with compensation for x," "with counterplay," etc. > >> >>Such an evaluation is nonsense anyway. There should properly be only 3 >>evaluations: >> >>1. Winning position >> >>2. Drawing position >> >>3. Losing position >> > >That would be great if it were possible, but except for forced mates and >forced repetitions, there are no such "exact evaluations" in the actual >game. A GM might say "this is winning" but it is based on very fuzzy >"computation" done mentally based on past experience and preferences. > > > > > >>It would be nice if a program could work as follows: >> >>"nb5. This position contains a possible bishop trap". >> >>"nd5. This puts more pressure on the opponent's king" >> >>"Opponent classification: bishop trap success rate = 25%" >> >>"Opponent classification: king attack success rate = 15%" >> >>"Choice = nb5". > >That is about "discernability". It is a tough problem but a well-known >issue in computer chess. > > > >> >>-g
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.