Author: Tom King
Date: 14:06:54 03/10/03
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On March 10, 2003 at 15:16:54, Andrew Williams wrote: >On March 10, 2003 at 14:49:30, Tom King wrote: > >>Hi all, >> >>One search extension which most programs seem to use is the passed pawn pushing >>extension. When a move is made which is a passed pawn push to the 7th rank, we >>extend the search by a ply. >> >>My programs has got away without this extension for years. Or perhaps "got away" >>isn't right.. there have been losses which this extension might have prevented. >> >>Anyway, what do people think of this extension. Worth having? If so, what value >>would you attach to it? >> >>Regards (and hi to all), >>Tom >>tom@silentshark.co.uk > >Hi Tom, > >At the moment, mine has: > >int extendPawnToSeventh = ONEPLY; >int extendPawnToSixth = DONOTEXTEND; >int extendPassedPawnPush = DONOTEXTEND; > >I've tried fractions for the other two, but never really found any success. > >Andrew okay.. so you're just extending on a push to the 7th rank. Any view on the value of this extension. I'd guess it's worth a lot less (ELO wise) than the standard get-out-of-check extension, but perhaps more than certain other extensions? Regards, Tom
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