Author: James Robertson
Date: 12:12:33 01/26/99
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On January 26, 1999 at 10:05:09, KarinsDad wrote: >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. Another good way to do this is have your "pawn" hash scoring include the king. This will reduce your hits to the pawn hash, but you don't have to worry about the wrong pawns advancing, etc, as the score takes the king location into account. James > >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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