Author: Vincent Diepeveen
Date: 12:18:04 08/13/02
Go up one level in this thread
On August 13, 2002 at 07:23:38, Uri Blass wrote:
>My definition for a sacrifice or blunder
>is a move that lose material based on
>the depth that programs can see.
>
>The definition of losing material is based on
>the material values 1,3,3,5,9.
with all respect but your table is outdated in advance.
a) 2 rooks are weaker than a queen in 99.9% of all cases
the computer sees 2 rooks for a queen
b) this table indicates that giving away 2 pieces for a rook+pawn
is great
c) giving away a piece for 3 pawns is great according to this
table, especially if we know that one of the 3 pawns gets
a passer
So the definition is not correct!
In diep queen = 11.5 pawns
rook = 5.5 pawns
piece = 3.6 pawns
and i have special cases to catch weird cases which sometimes happen.
>For a clear definition we need to compare
>the evaluation of a program with mainly material evaluation before and after the
>move when we give it an hour to search.
>
>A program with mainly material evaluation is defined to be
>a program with positional scores
>that are always smaller than 0.5 pawns.
again a wrong assumption. Some very old
programs (like some at dedicated machine) have like 2 extra
rules in evaluation which always is like "if passer on 2nd row
then score += 3.0"
In short especially a few very materialistic beancounters are tuned
to very high scores, whereas others with loads of chess knowledge
usually are more relaxed in this respect.
>The definition of losing material moves may be dependent
>on the hardware that is used and the quality of the
>search rules of the program that is used.
First throw your definition away and start rephrasing.
>I define wrong sacrifice to be a blunder(the decision if a sacrifice is wrong
>is a human decision).
>The question is if we expect to find majority of blunders or
>majority of sacrifices in interesting positions from computer games(positions
>when the game is already decided are not interesting).
>Uri
This page took 0.01 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.