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Subject: Re: passed pawn evaluation.

Author: Robert Hyatt

Date: 06:35:24 01/13/04

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On January 13, 2004 at 02:06:18, Janos Keinrath wrote:

>On January 12, 2004 at 10:02:07, Robert Hyatt wrote:
>
>>On January 12, 2004 at 03:09:10, scott farrell wrote:
>>
>>>On January 11, 2004 at 21:18:30, macaroni wrote:
>>>
>>>>I have recently been fiddling arround with some passed pawn code, however I just
>>>>can't seem to get it working very well. Can you give me an idea of what sort of
>>>>values you give different types (in different stages) of passed pawns?
>>>>cheers
>>>>Tor
>>>
>>>I think it needs lots of knowledge.
>>>
>>>What I did is use several pieceSquareTables, for different types, like blocked,
>>>isolated, defended, passed, connect passed (probably the most important),
>>>defended passed, etc
>>>
>>>I then tweeked values to solve certain problems. With various psTables, you end
>>>up with lots of levers to play with.
>>>
>>>Scott
>>
>>Watch out about "connected passers."
>>
>>give white two pawns on d2/e2.  Give black two pawns on a2/h2.  Both kings
>>in the center.  Which side do you like?  :)
>>
>>This happens a lot vs GM players, once they see the hole.  They will
>>happily give you those two connected passers.  :)
>>
>>Connected passers are good when you have pieces...  But with no pieces,
>>look out.
>
>
>[D]8/3kP3/3P4/p6p/8/8/8/4K3 w - -
>
>Here is a tricky position for static eval,
>some program's static evaluation gives very high score
>for white (connected passed pawns, 6th-7th rank),
>but white lost.


Here is Crafty's "static eval":

White(1): sc
end-game phase
              clearing hash tables
note: scores are for the white side
material evaluation.................   0.00
development.........................   0.00
pawn evaluation.....................   3.03
passed pawn evaluation..............   0.03
passed pawn race evaluation.........  -5.35
king safety evaluation..............   0.00
interactive piece evaluation........  -2.12
total evaluation....................  -4.41


It agrees with you. Black is winning here. :)



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