Author: Andrew Williams
Date: 02:34:41 12/14/98
Hello all,
I'm trying to work out how to implement capture/recapture extensions in
my program. I have had a look at crafty and gnuchess and I've tried
several approaches, viz:
1 Extend when a capture followed by recapture restores the material
balance we had at the root.
2 Extend when the capture/recapture restores the material balance from
before the sequence.
3 Extend when the capture and recapture are on the same square (and same
material value).
In all these cases, I seem to get a much larger tree and often lose a ply
of search because of this. So, three questions:
(a) Am I on the right lines with 1, 2 and 3 above?
(b) Is it normal to lose depth when doing this?
(c) Generally speaking, it better to complete d7 with this extension than
d8 without it?
I realize that these questions probably aren't yes/no style questions, so
thanks to anyone who takes the trouble to reply.
Regards
Andrew Williams
(Author of PostModernist on ICC)
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