Author: James B. Shearer
Date: 21:24:59 02/01/99
Go up one level in this thread
On January 31, 1999 at 10:43:10, Robert Hyatt wrote:
<snip>
>
>No idea why it takes 16 plies however... but I'll look...
>
A big part of the reason is crafty 16.3 is far too optimistic about g5.
This can lead to the positions like that shown below which crafty scores -2.35.
This is quite optimistic considering that material is even and the position is a
dead draw. Crafty 15.15 scores this position -1.19 (see below) which is still
optimistic but better.
James B. Shearer
Crafty v16.3
White(1): in fit40a
White(1): setboard 8/8/4p1k1/1p1pP1p1/p2Pp1P1/P1P5/1P2K3/8 b - - 0 40
+---+---+---+---+---+---+---+---+
8 | | | | | | | | |
+---+---+---+---+---+---+---+---+
7 | | | | | | | | |
+---+---+---+---+---+---+---+---+
6 | | | | | *P| | *K| |
+---+---+---+---+---+---+---+---+
5 | | *P| | *P| P | | *P| |
+---+---+---+---+---+---+---+---+
4 | *P| | | P | *P| | P | |
+---+---+---+---+---+---+---+---+
3 | P | | P | | | | | |
+---+---+---+---+---+---+---+---+
2 | | P | | | K | | | |
+---+---+---+---+---+---+---+---+
1 | | | | | | | | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
Black(1): exit
Black(1): display
Black(1): score
end-game phase
clearing hash tables
note: scores are for the white side
material evaluation................. 0.00
development......................... 0.00
pawn evaluation..................... -0.75
passed pawn evaluation.............. -0.40
passed pawn race evaluation......... -0.50
interactive piece evaluation........ -0.70
total evaluation.................... -2.35
Crafty v15.15
White(1): in fit40a
White(1): setboard 8/8/4p1k1/1p1pP1p1/p2Pp1P1/P1P5/1P2K3/8 b - - 0 40
+---+---+---+---+---+---+---+---+
8 | | | | | | | | |
+---+---+---+---+---+---+---+---+
7 | | | | | | | | |
+---+---+---+---+---+---+---+---+
6 | | | | | *P| | *K| |
+---+---+---+---+---+---+---+---+
5 | | *P| | *P| P | | *P| |
+---+---+---+---+---+---+---+---+
4 | *P| | | P | *P| | P | |
+---+---+---+---+---+---+---+---+
3 | P | | P | | | | | |
+---+---+---+---+---+---+---+---+
2 | | P | | | K | | | |
+---+---+---+---+---+---+---+---+
1 | | | | | | | | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
Black(1): exit
Black(1): score
end-game phase
clearing hash tables
note: scores are for the white side
material evaluation................. 0.00
development......................... 0.00
pawn evaluation..................... -0.39
passed pawn evaluation.............. -0.40
passed pawn race evaluation......... 0.00
interactive piece evaluation........ -0.40
total evaluation.................... -1.19
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