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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