Author: Miguel A. Ballicora
Date: 08:31:16 01/19/01
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On January 19, 2001 at 05:15:41, Uri Blass wrote: >[D]8/8/p1r5/6k1/KP6/8/8/5R2 b - - 0 1 > >In this position Rebel century3 blundered and played 66...Rb6 when white >probably forces mate in 48(The main line is losing a tempo by 67.Rf2 Kg4 68.Rf8 >Kg5 69.Rf1 when Rebel to mope has to play a move that desroys black's position I >did not learn the position to understand exactly why but I believe the main line >of chess programs) Because the best square for the bK is g5, since it has to protect f4. It is important because after Rf4, White can now advance the King to a5 without fearing Rb5+. If the black king goes to g4, it look like will fall in a trap between the 4th and 5th rank. The 4th, white will check with, say, Rc1-Rc4+ and Ka5 or if the bK is in the 5th rank Rd1-Rd5+ and Ka5. It is not clear to me now why it is better to lose a tempo with the rook in f1 and not in f2, but there might be a hidden defense that could delay the defeat bringing the black rook to the 1st rank. This is all carbon analysis in front of the screen... I might be wrong. > >How much time does your program need to find 66...Rc3 or 66...Rc2 that are >probably enough for a draw(I am not sure and I may be wrong about it)? I looks like a better move but black still has problems. I need to analyze but I like Ra1 Kf6/Ka5 Miguel > >How much time does it need with tablebases and how much time does it need >without tablebases? > >Uri
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