Author: Robert Hyatt
Date: 20:49:07 01/25/01
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On January 25, 2001 at 21:35:10, Will Singleton wrote: >On January 25, 2001 at 09:41:41, Robert Hyatt wrote: > >>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.. > >I predict the capture extension version will win easily, especially in medium >blitz games (5 0). I have done that test (but not the wac test), and my program >definitely plays better with a limited capture extension. I have run 3 100 game matches so far. In the first, the recapture extension won by a small margin. IN the second, it lost by a big margin. In the third.. can't report yet... 3 more games to go... I am playing fairly fast blitz games which is where I generally see the best results for extensions... More data in a bit...
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