Author: James Swafford
Date: 11:46:16 06/22/99
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On June 21, 1999 at 14:35:22, Andrew Williams wrote: >On June 21, 1999 at 13:53:48, James Robertson wrote: > >>My program does check, recapture, and pawn push extensions, but I have heard >>that many programs do a lot more. I think Gromit said he does something like 10 >>different extensions? >> >>Could someone please tell me what different kinds of extensions are sometimes >>used? It would be cool to try them out on my program. >> >>James > >I do the above plus null move mate threat (when the null move search returns >a -MATE score, I extend by a ply). I also have a single response to check >extension, if there's only one way of getting out of check - but I don't >allow too many of these in one search. I've also recently tried re-searching >with one ply extra if I'm about to take a beta cutoff, but my null move search >suggested I would lose a Piece if I "passed". This doesn't seem to be doing I'm not sure I understand this. If null_score-alpha>=some_piece_value, && you're about to fail high, you extend *instead* of returning beta? >any harm (which makes a change) so I'm leaving it in at the moment. I'm messing >about a lot with my extensions at the moment (not very successfully), so I'd >also be interested in what others do. > >Also, there was a message just after the Rebel-Rohde match where Ed Schroeder >gave a few hints as to what he does - might be worth looking at that for some >very interesting ideas. > >Andrew Williams
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