Computer Chess Club Archives




Subject: Re: Static evaluation after the "Positional/Real Sacrifice"

Author: Jon Dart

Date: 07:09:31 12/03/99

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This is Arasan 5.3's score:

material score = 114
white pawn score = -4
black pawn score = -3
outside pawn score = 3
king safety(w) proximity = 0 cover = -31 mlevel = 10
battery (b): score = -20 mate= 0 stack = 0
battery (b): score = -24 mate= 0 stack = 1
king safety(b) proximity = -65 cover = -72 mlevel = 10
net king safety score = 101
total score =  0.42

(The scores are based on 1 pawn = 64 units. "proximity" is
a measure of closeness of enemy pieces, "cover" of the
king's pawn cover, "mlevel" of the opponent's material
level. "battery" measures danger from rooks/queens
on an open file near the king).

Arasan generally doesn't give monster scores for king safety/
danger. 101 (about +1.5 pawns) is a pretty high score here.

King safety is very tricky. Here is a position my program had
recently against zippy (GnuChess):

r1bq1r1k/ppp3pB/2nb2Qp/3pp2N/3P4/2P2N2/PP3PPP/R4RK1 b - - 0 1

Arasan thinks White has a fine attack going, but in fact there
is really nothing he can do (Crafty doesn't like this position
for White because the bishop's position triggers its "trapped
bishop" penalty - and it is in danger, but that's another issue).


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