Author: Uri Blass
Date: 21:00:14 01/12/04
Go up one level in this thread
On January 12, 2004 at 20:05:11, scott farrell wrote: >On January 12, 2004 at 17:34:52, Uri Blass wrote: > >>I do not see when it happens in crafty and note that it is not only a question >>of speed when it is not clear what is faster and if I understand correctly >>crafty may be wrong when a sequence of captures that is finished in trading >>kings happens and it may happen in the endgames. >> >>[D]8/5r2/5k2/3R1p2/5K2/8/8/8 w - - 0 1 >> >>Rxf5+ is a good capture but based on SEE that let trading kings it can be >>pruned. >> >>Uri > > >thanks uri/sune, added some stuff about a king, > >my acutal check was if king is capturing, and -stm still has pieces in the >capture list, return -king for that part. I also added the dont xray the king, >but I didnt see any effect - but clearly it is smart. > >My goal is to have 2 SEE, one fast, and one smart. > >output from chompster: > >the key is: >maxthreat/SEE+/SEE ala crafty/NA > >as you can see it scores the Kxf5 as +1, and kxf5 as -50, interestingly with >checks in the qsearch either way found kxf5+ with the same 33 nodes. I think >crafty might need 2 plies instead of one, with an incorrect SEE and no checks in >the qsearch. > >notice RE5 says 0 on both SEE and SEE+, I think SEE (ala crafty) just minimax's >the king swap and accidently gets the right score. > >8/5r2/5k2/3R1p2/5K2/8/8/8/ w - - 0 0 >normal moves: >RD8 (D5D8) , maxThreat=0/0/0/0 >RD7 (D5D7) , maxThreat=0/-5/-5/0 >RD6 (D5D6) , maxThreat=9/0/0/0 >RA5 (D5A5) , maxThreat=0/0/0/0 >RB5 (D5B5) , maxThreat=0/0/0/0 >RC5 (D5C5) , maxThreat=0/0/0/0 >RE5 (D5E5) , maxThreat=0/0/0/0 >RxF5 (D5F5) , maxThreat=9/1/-4/0 >RD4 (D5D4) , maxThreat=0/0/0/0 >RD3 (D5D3) , maxThreat=0/0/0/0 >RD2 (D5D2) , maxThreat=0/0/0/0 >RD1 (D5D1) , maxThreat=0/0/0/0 >KE5 (F4E5) , maxThreat=9/-50/0/0 >KxF5 (F4F5) , maxThreat=9/-50/-4/0 >KG5 (F4G5) , maxThreat=9/-50/-50/0 >KE4 (F4E4) , maxThreat=1/-50/-50/0 >KG4 (F4G4) , maxThreat=1/-50/-50/0 >KE3 (F4E3) , maxThreat=0/0/0/0 >KF3 (F4F3) , maxThreat=0/0/0/0 >KG3 (F4G3) , maxThreat=0/0/0/0 I do not understand it. Why maxthreat of Re5 is 0 when maxthreat of the illegal Ke4 is 1? both threat the pawn at f5 and if we talk about new threat then they do not have a new threat. I also do not understand why threat against the king is 9 when SEE of exposing the king to check is -50. Uri
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