Author: Steve Coladonato
Date: 05:00:53 05/23/00
Go up one level in this thread
On May 23, 2000 at 00:05:36, Jeremiah Penery wrote:
<snip>
>http://www.rebel.nl/db2.htm
The following in an excerpt from the above link and I don't fully understand the
evaluation.
13. Nc6-a5
Kasparov,G :11.00 -0.03 Nc6-a5 Bb3-c2 c7-c5 d4-d5 g7-g6 b2-b4
Rebel 8.0 :11.00 -0.03 Nc6-a5 Bb3-c2 c7-c5 d4-d5 g7-g6 b2-b4
14. Bb3-c2
DEEP BLUE :11.00 0.13 Bb3-c2 c7-c5 b2-b3 Ra8-c8 Bc1-e3 g7-g6
Rebel 8.0 :11.00 0.13 Bb3-c2 c7-c5 b2-b3 Ra8-c8 Bc1-e3 g7-g6
14. c7-c5
Kasparov,G :10.00 -0.05 c7-c5 b2-b3 Ra8-c8 Bc1-e3 g7-g6 d4xe5
Rebel 8.0 :10.00 -0.05 c7-c5 b2-b3 Ra8-c8 Bc1-e3 g7-g6 d4xe5
I am interpreting the evaluations to be relative and not absolute (for the 3
moves above, the white position is evaluated better in all cases) So, at move
13, Rebel evaluated the position -0.03 at 11 ply. At move 14, the evaluation is
now 0.13 at ply 11 again. This I can understand because the line has changed
from d4-d5 to b2-b3 and move 14 has looked one ply deeper than move 13.
However, on black's move 14 the ply count is now 10 which indicates that the
depth reached in the analysis is the same as that for white's move 14 but the
evaluation has changed from +0.13 to +0.05 (absolute) the line being identical
except fot the inclusion of d4xe5 in the printout. My question is why would the
program change its evaluation of the position if it searched to exactly the same
depth?
Regards,
Steve
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