Author: Robert Hyatt
Date: 06:35:24 01/13/04
Go up one level in this thread
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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