Author: Gerd Isenberg
Date: 12:13:16 02/26/04
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On February 26, 2004 at 12:14:59, Vincent Diepeveen wrote: >On February 26, 2004 at 04:23:01, Gerd Isenberg wrote: > >><snip> >>>>To avoid the white versus side to move score chaos, it makes sense to mirror all >>>>>current black to move positions vertically with white to move. >>>> >>>>Oups, with mirror vertically i mean white pawn on e2 becomes black pawn on e7 >>>>and so on. >>> >>>i prefer also left right mirrorring. I bet diep is one of the few programs still >>>displaying the same score then :) >> >>A good point, with respect to castle rights of course. >>In my current program there are some asymmetries in (early) middlegame :-( >> >>In my new approach i will implement FRC-castles, but mirroring castles (rights) >>is still not possible since king/rooks target squares are still asymmetric. >> >>Gerd > >You're not getting my point exactly. > >Try some known testset positions at Fritz and mirror them diagonally over a1-h8 >, so both color mirroring and left right mirrorring. Yes, i wrongly implied, if color mirroring is ok and left-right mirroring is ok, combining both is ok too. But of course, it depends on the implementation. > >Will it still find the solutions? > >I bet several positions it won't :) > >In all those positions there has already been castled, so no such problems. > >I'm talking about king safety patterns which are there for g,h file but not a,b >file. You got me. Since my vertical color mirroring is perfectly ok (i'll hope), i currently have exactly those asymmetries you mentioned with king- and queen wings ;-) Not that i'm worried about that so much, since there are only slight differences - anyway left-right symmetry is better to fix bugs and of course small eval differences result in totally different search trees and behaviour. Thanks for pointing that out! Even more strange, since i already had implemented that mirroring feature with the intention to check left-right mirrored endgame positions. But no kingsafety issues which i always considered asymmetric for some reasons... Gerd
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