Author: Uri Blass
Date: 06:55:17 08/31/03
Go up one level in this thread
On August 31, 2003 at 09:06:52, Sune Fischer wrote: >On August 30, 2003 at 13:20:04, Ed Schröder wrote: > >>On August 30, 2003 at 08:12:16, Uri Blass wrote: >> >>>On August 30, 2003 at 06:54:19, Ed Schröder wrote: >>> >>>>On August 30, 2003 at 04:17:28, scott farrell wrote: >>>> >>>>>>1) Simple case : >>>>>>[d] r1bqkb1r/pppp1ppp/2n2n2/4p3/3PP3/P4N2/1PP2PPP/RNBQKB1R b KQkq - 0 4 >>>>>> >>>>>>Trivial to see that Bb4+ is to be not extended. >>>> >>>>>When i first saw your idea I was very excited. I tried that exact case, a check >>>>>the does not capture, and can be captured by a pawn (I didnt look if the pawn is >>>>>pinned against the king or other piece), and chompster's performance on WAC >>>>>dropped significantly. >>>> >>>>>I think chompster has so much futility pruning, and search reductions code, that >>>>>if we extended something stupid, it gets pruned fairly quickly or reduced (the >>>>>opposite of extension). >>>> >>>> >>>>There is a more plausible explanation, that is, there are probably no good rules >>>>not to extend checks, just extend them. >>>> >>>>My best, >>>> >>>>Ed >>> >>>I do not find something illogical in the original explanation >>> >>>I think that there are good rules not to extend checks but the rule that was >>>used was not good enough and you may need more conditions not to extend in order >>>not to do the mistake of not extending important moves. >> >>Well, as soon as you have found some rules please post. > >Checker is a lone attacker, undefended but attacked by non-pinned piece..? >Happens all the time I think, just print incheck() positions from the tree. > >-S. not good enough because pins are not the main problem here and I suspect that indirect threats may be a bigger problem. I do not want to discuss it(I already have one rule when not to extend checks but I plan later to find more rules and telling other people about them meaning losing my relative advantage). Uri
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