Author: Robert Hyatt
Date: 11:15:54 10/01/98
Go up one level in this thread
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. Next, I tried your variation above where you say "programs do not under stand this". Would you call this "understanding that white can win that ending"??? time surplus 0.00 time limit 1666:39 (1666:39) depth time score variation (1) 10 0.30 Mat19 8. Kd3 Kb5 9. Ke4 Kc4 10. Kf5 Kd3 11. Kxg5 Kd4 12. Kxh4 <EGTB> 10-> 0.31 Mat19 8. Kd3 Kb5 9. Ke4 Kc4 10. Kf5 Kd3 11. Kxg5 Kd4 12. Kxh4 <EGTB> time=0.32 cpu=18% mat=0 n=7341 fh=97% nps=22940 IE *some* programs can figure that out quite easily, and not enter a line that is dead lost. This is probably why I don't get Rxb2 *ever*. It "knows" better...
This page took 0.02 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.