Author: martin fierz
Date: 03:06:06 08/08/03
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On August 08, 2003 at 05:54:56, martin fierz wrote: >On August 08, 2003 at 05:14:27, Uri Blass wrote: > >>On August 08, 2003 at 04:16:34, martin fierz wrote: >><snipped> >>>uri's argument of 3+3*1 < 9 is far too simplistic, in endgames against a lone >>>queen the question is whether you can construct a fortress like >> >>fortress are the exception and in most practical cases the queen is stronger. > >of course > >>If you want to add knowledge about exceptions you can do it but without special >>knowledge it is better to tell a program that the queen is stronger because in >>the opposite case it is going to blunder more often. >> >>Uri > >of course again. i just added these fortress positions as some other examples >where 9-6 is not a win. the main point (which i probably didn't make clear >enough...) was about the Q-N+3P position: >your comment on that position was: > >"A queen equal more than knight and 3 pawns and bonus for passed pawns is not >enough compensation" > >which i find a very simplistic evaluation of that position. that's why i >included the other position which is practically unchanged with the pawn on f4 >instead of f6, and already black has enough compensation. it's just not at all >obvious that either of the two positions is drawn or lost, certainly it's not a >question of 6<9 - it's a question of how much compensation exactly these passed >pawns give black, which is VERY hard to see! > >cheers > martin PS: if you move the entire original position one square toward the white side, it's a draw too - and white has to give a perpetual in order not to lose. i really don't think it's clear at all on general principles that white is winning in the original position. interesting question though - how far advanced do the passers have to be so that there is enough compensation with connected passers + piece vs queen? is there some kind of general rule for this? cheers martin
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