Author: Robert Hyatt
Date: 06:41:41 01/25/01
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On January 25, 2001 at 00:16:04, Andrew Dados wrote: >Thanks Bob for very interesting report. >A couple of loose thoughts... > >Recapture extension is intuitively no good for tactical suite for a simple >reason: all tactical lines give up temporarily material. And lines with >exchanging down pieces are not 'beautiful' for humans - which was probably one >of conditions for selecting a 'tactical' position into set like WAC. > >It is hard to say if your program plays weaker or stronger in practical games >because of it. And, btw, one of Craftys strengths is exchanging down to won >endgame. Maybe some sort of nunn-type match between 2 versions can give more >data about it? > >And if you come down to think about the trend - It would be interesting to run >your test with recapture extension going below zero....:) > >-Andrew- Ken Thompson got me started on this in the early 80's. The idea is that if you are in some kind of trouble (say losing a pawn) then one way to help "hide" this is the good old BxN PxB sequence. BxN forced the opponent to recapture the bishop, and that eats two plies of your total search, maybe hiding the pawn loss. Extending a ply partially offsets this... But I have never tested it very thoroughly. I am going to turn it off on one version and play an extended match, 2cpus to 2cpus.. I'll report on the result later..
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