Author: KarinsDad
Date: 07:05:09 01/26/99
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On January 26, 1999 at 05:12:09, Andrew Williams wrote: >On January 25, 1999 at 18:30:20, KarinsDad wrote: > >> >>I don't understand. Couldn't you just as easily find positions that had castling >>in the TT way before you actually castle in your position? What is so special >>about castling? Is it that the number of transpositions drop drastically after >>castling (even though some would still be there)? Also, wouldn't castling often >>be within opening book moves so you are not yet in your TT? > >Sorry, I wasn't being particularly clear here. What I mean is that after I >castle, I change the pawn scoring to reflect the side the King is now sitting >on. So the pawns on that side are told to stay put, while the ones on the >other side are allowed to advance (this is a simplification, of course). So >I clear the TTs because the scores from before castling are not compatible >with those after castling. > > >Andrew Wow! What a good idea! Probably wouldn't have figured this one out on my own in a long time. With this in mind, do you also modify the pawn information within the search tree once you castle there as well (i.e. 6 ply down, it castles, hence the evaluation function should have a pawn modification below that node which is different than the pawn structure information, I assume you are using a separate pawn structure evaluation)? Also, if you do what I ask in the second paragraph, I assume that you only prune out the moves (and their branches) not actually made (i.e. any move at root other than the castle move). This is the reason I started posting and reading here. Thanks, KarinsDad
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