Author: blass uri
Date: 02:54:16 01/30/00
Go up one level in this thread
On January 30, 2000 at 03:10:32, Howard Exner wrote: >On January 30, 2000 at 02:32:37, blass uri wrote: > >>On January 30, 2000 at 02:18:43, blass uri wrote: >> >>>On January 29, 2000 at 23:11:47, blass uri wrote: >>> >>>>On January 29, 2000 at 17:01:45, Dan Andersson wrote: >>>> >>>>>Im certain he does not mean a forced win, as in a short variation. But black has >>>>>a very difficult position, do not doubt that. And ss=10 is that 5 moves w. >>>>>extensions? If so, the cm should have big trouble defending the position. Btw h6 >>>>>weakens blacks position considerably. >>>>> >>>>>Regards Dan Andersson >>>> >>>>I do not think that h6 weakens blacks position considerably. >>>>The opposite. >>>>it prepares Bg5 for the future. >>>> >>>>I believe that Rxf7 is the best move after h6 otherwise chessmaster could >>>>probably find something better than Rxf7. >>>> >>>>chessmaster is very strong at tactics in this position and if there was >>>>something for white it could probably find it. >>>> >>>>I guess that ss=10 is more than 5 moves extension. >>>>chessmaster can find evaluation of more than 4 pawns advanatge for white for >>>>black's move Qe8 in 10-15 minutes of search and I believe that you need more >>>>than 10 moves of extension to do it. >>>> >>>>chessmaster found h6 after 4-5 hours so if there is a tactical combination for >>>>white it must be more than 3 plies deeper than Rf6. >>>> >>>>Uri >>> >>>I found that 20...h6 instead of Qe8(and not only 20...a4 Rf3 h6) is not losing >>>more than a pawn. >>> >>>chessmaster finds nothing better than Rf6 Kh7 Rxf7 >>> >>>I suspect that there are other reasonable moves for black(for example >>>chessmaster could not find a win for white after Qc8 in the first few minutes) >>>Uri >> >>I see it needs more than 20 minutes to see that Rf6 wins against Qc8 at depth >>2/12 (after the game move it needed less than 3 minutes to see that Rf6 is >>winning at depth 1/11) >> >>Uri > >This is turning out to be a fascinating position for computers to play over. >Does any computer play 20. ... a4 in say less than ten minutes? Junior5.9 changes its mind from 20...Qe8 to 20...a4 in something between 6 and 7 minutes. It did not see the losing evaluation for Qe8 and prefered a4 by only a small part of a pawn. > >How would computers continue after a line like the following: >20. Qh5 a4 21. h3 axb3 22. axb3 > >Here white is planning to play actively with the rooks while tucking the king >away to h2 if necessary. Here the main line of chessmaster6000 after 2 hours begin with 22...Qe8 23.Rf6 g6 24.Qh6 Kh8 25.R1f4 g5 26.Rf1 with 0.44 pawns advantage for white. Uri
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