Author: blass uri
Date: 14:46:47 10/01/98
Go up one level in this thread
On October 01, 1998 at 14:15:54, Robert Hyatt wrote: >On October 01, 1998 at 11:40:46, blass uri wrote: > >> >>On October 01, 1998 at 08:21:43, Robert Hyatt wrote: >> >>>On October 01, 1998 at 01:11:12, blass uri wrote: >>> >>>> >>>> >>>> >>>>8/1r5p/6p1/8/P2k4/K6P/1R4P1/8 black to move >>>> >>>>Many programs are playing Rxb2 because they computes that white is losing its >>>>pawn in the pawn endgame and do not understand that after Rxb2 Kxb2 Kc4 Kc2 Kb4 >>>>Kd3 Kxa4 white is winning. >>>> >>>>Rxb2 is not the first move they want to play because they need time to see that >>>>black wins a pawn by this stupid mistake after Rxb2 Kxb2 Kc4 Ka3 >>>> >>>>Is there a program that understand by static evaluation that white is winning >>>>with the king at d3?(static evaluation at least 1.5 pawn advantage for white) >>>> >>>>Uri >>> >>>I get this: >>> >>> +---+---+---+---+---+---+---+---+ >>> 8 | | | | | | | | | >>> +---+---+---+---+---+---+---+---+ >>> 7 | | *R| | | | | | *P| >>> +---+---+---+---+---+---+---+---+ >>> 6 | | | | | | | *P| | >>> +---+---+---+---+---+---+---+---+ >>> 5 | | | | | | | | | >>> +---+---+---+---+---+---+---+---+ >>> 4 | P | | | *K| | | | | >>> +---+---+---+---+---+---+---+---+ >>> 3 | K | | | | | | | P | >>> +---+---+---+---+---+---+---+---+ >>> 2 | | R | | | | | P | | >>> +---+---+---+---+---+---+---+---+ >>> 1 | | | | | | | | | >>> +---+---+---+---+---+---+---+---+ >>> a b c d e f g h >>> >>>Black(1): sc >>>end-game phase >>> clearing hash tables >>>note: scores are for the white side >>>material evaluation................. 1.00 >>>development......................... 0.00 >>>pawn evaluation..................... 0.12 >>>passed pawn evaluation.............. 0.24 >>>passed pawn race evaluation......... 0.00 >>>interactive piece evaluation........ -0.23 >>>total evaluation.................... 1.13 >> >>I did not ask about the static evaluation of the originial position but about >>the static evaluation of the position after the line Rxb2 Kxb2 Kc4 Kc2 Kb4 kd3 >>kxa4 >> >> >>> >>> >>> >>>when I do a search, I never get "rxb2" as reasonable: >> >>programs get Rxb2 as reasonable because of the following line >>Rxb2 Kxb2 Kc4 Ka3 g5 g3 h5 g4 h4 Kb2 Kb4 kc2 kxa4 >>they need time to find this line(more than 1 or 2 seconds). >>white also can win this pawn ending but programs do not understand this. >> >>Uri > > >first, I let crafty search for > 6 minutes. *no* Rxb2. I tried the position with crafty15.20 without tablebases(48M hash tables and 6M hashpawn tables) and it found Rxb2 after more than 12 minutes at depth 12 with evaluation -0.39 I used pentium200MMX I do not see how tablebases can help because the evaluation in the positions that they can help is lower than -0.39 Uri
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