Author: Robert Hyatt
Date: 09:23:21 08/04/99
Go up one level in this thread
On August 04, 1999 at 11:55:03, KarinsDad wrote: >On August 04, 1999 at 11:02:46, Fernando Villegas wrote: > >>I am not a programmer, but a seasoned player and maybe I can hint to other way >>to see this problem of the ?easy moves? on the ground of what a human player >>thinks and do when faced with an obvious move to do. And what an experienced >>player do is to discriminate between two different classes of ?obvious moves?: >>normal ones and those to answer maybe-winning-sacrifices moves by the rival. >>A normal one is just to recapture a piece that has made a normal capture before. >>If my opponent take my bishop with a knight, so not giving nothing for free, I >>just analyze a few ply in order to discover if that capture is or not part of a >>mate combination, specially if that happens near my king. Mates combinations >>beginning with a normal capture -by example, to kill a defensive piece before >>launching the mate attack- normally are inside an horizon of no more -normally- >>than 6 ply. So in these kind of cases -recapture after a ?normal? capture- that >>should be enough in a couple of seconds of search for the program. >>But then we have the second class of obvious moves, those that follow an >>strange, no normal move. If my opponent play Bxh3+ , so losing at once material, >>I tend to thinks that is part of a masive attack and so i will not recapture at >>once, but take a deep look, in fact deeper than against any other normal move. A >>program should do the same each time an aparent sacrifice is being performed. An >>ad-hon culd be to consier the quealuty of he previous moves. I suppose that an >>opponent that have played several best moves according he program is not a >>beginner and so every unbalanced mve that he do shuld be consdered with the >>utmost care. And vice versa. >>So, easy moves should be treated depending of what class of capture is being >>perfomed by the opponent. Is a balanced one in terms of material? Happens near >>the king or the queen? Is not balaced but on the contrary lose material? >>I Hope not to bother nobody with maybe an obvious analysis...:-) >>Fernando > >Good point. However, I often see in GM games an in between move after a capture. >The opponent HAS to reply to the in between move and then a move or several >moves later, the first GM picks up the "normal obvious retake". I think it would >be difficult to differentiate between many different types of forced moves >without searching further (in the current paradigms). > >I think this area of chess programming is a non-trivial one which can only be >resolved when programs start thinking more like humans and less like deep >searchers. > >KarinsDad :) I think intuition has a lot to do with a human's "that was easy" move. IE you can intuit 'suspicion' (say) in a game like the one where Shirov played (I believe) Bh3 giving up the bishop for a winning endgame. A computer might think taking the bishop was obvious... but a human would think "wait a minute, this is a GM, GM's don't hang pieces very often, so lets look a bit further to see what is going on.." That "intuition" is a difficult thing to match, programming-wise...
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