Author: Andrew Williams
Date: 13:46:28 03/11/03
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On March 10, 2003 at 17:06:54, Tom King wrote: >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 I'm not sure I could quantify it, to be honest. It's just one of those things that just "feels" like it should be a good idea. I'm not even sure if I've ever really tested PM without it... Andrew
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