Author: Sune Fischer
Date: 16:48:35 04/21/04
Go up one level in this thread
On April 21, 2004 at 19:26:01, Gerd Isenberg wrote: >On April 21, 2004 at 18:51:32, Sune Fischer wrote: > >>On April 21, 2004 at 18:22:32, Sune Fischer wrote: >>>> >>>>5..a5 looks interesting. >>>>Does your trapped code ignore that possible lever or did you consider that b4 is >>>>defended by a pawn on a3? >>> >>>It looks like it is trying to break out the bishop, after axb4 axb4 it doesn't >>>see the bishop as trapped anymore, there is a hole in the cage. >>> >>>It belives it can get out via b6, a5 and now attack b4 which has become a >>>non-fortress pawn. >>> >>>It's not so easy too repair, if I mask out the forbidden squares between fills >>>so it doesn't stop and turn on an enemy square, then I also mask out a lot of >>>the trapped detection squares. >> >>Well it wasn't as hard as I thought, no more a5 :) >> >>[D]1k1r3r/b1p1n3/2p2pq1/1pP1p3/1P2P2p/3P1P2/2Q1NKP1/R1B3R1 b - - 0 1 > >I see, the position where the bishop is still trapped with worse king safety, as >you count the unattackable (by pawns) and rammed knight pawn on b4, defending >own c5-fortress pawn as fortress pawn too. Yes the first step is to figure which pawns a blocked. I use of course rammed of own color (incl. the one on c7) and pawns which can't advance without being captured and finally the defended pawns of the opponent. The b4 pawn has the wrong color and is not defended, so there was a problem with the fills penetrating from the center through b4 to a5 and inside. By masking out attacked squares between fills we stop the flood from moving from a5 to the inside. -S.
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