Author: Sune Fischer
Date: 10:22:18 01/20/04
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On January 20, 2004 at 12:01:59, Robert Hyatt wrote: >Then Grandmasters are producing tons of "eye candy" every day as they >merrily annotate games and give variations. Are you really a chess player? >IE I want analysis, not just "white is better" myself. Yes I am really a chess player, and I know how to analyze using an engine. You need to go back and forth down the lines that look interesting. Particularly big sacrifices can take a while for engines to see, they fail high 10 times faster if you just execute the move so nullmove and other pruning devices gets a better root window to work with. >>It never shows you all the refutations, say there is a queen en prised on the >>board, the PV at iteration 5 shows us taking it but at ply 6 we get a completely >>new line. >>Why can't we take the queen, what's wrong with that, what did the engine see? > > >That is obtainable, if you want to know. You just step down the PV to the >point in question (you _do_ have a PV to step down, right, otherwise you would >not even know the queen is hanging except by the score maybe) and then let the >search show you the PV for the move you are questioning. If you have lost the first half of the pv how are you going to track it? >> >>That's what I want to know, as a chessplayer :) >> > >Me too and that is what I get by having the PV displayed. With just a best >move or best move and sometimes random moves below it being shown, I have a >harder time. Just note the people that started this thread. Obviously it >meant something to them... Looks to me like Shredder is a bit of an extreme example. You have the same problem though if you can't resolve a fail high, no pv :) >Mine almost always goes to the leaf position. On occasion it gets cut short, >but that is the exception rather than the rule. Even after the search has being going on for a while and there are lots of good hash entries? >In tactical positions I trust the PV to the end. IE mate in 15 is not going >to be flakey near the end. Nor is winning a pawn or piece, or promoting >something... > >So it is not as useless as you seem to think. The hash shows the same behavior on tactical positions. -S.
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