Author: Gerd Isenberg
Date: 03:21:23 12/25/02
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On December 24, 2002 at 19:38:27, Vincent Diepeveen wrote: >On December 24, 2002 at 03:40:24, Bruce Moreland wrote: > >>A backward pawn has the following attributes: >> >>1) It cannot be defended by a pawn. >>2) If it advances, it will be captured by an enemy pawn. >>3) It is now, or can advance to become, the base of a pawn chain. >> >>The classic case is black pawns d6, e5, white pawn e4. >> >>The pawn doesn't have to be on an open file. >> >>I argue that the pawn cannot be a member of a duo, > >I disagree. Some pawns can be member of a duo and backward. > >For example white Rb1,c5 >black b7,c7 Kc8 > >b7 is backward. c5 is not. It is isolated. Hi Vincent, That's interesting. I thought backwardness is independent of pieces (per definition) and could therefore been calculated without considering pieces and stored in the PawnHash-Table?! What is the exact reason whether c5 is not backward. 1. no candidate 2. if two opponent pawns have backward-distance, the most advanced is not backward. 3. because it's isolated. Regards, Gerd > >>nor can it advance to form >>one. Meaning, that in my example above, if you put a white pawn on c4, black >>pawn on c6, d6 is not backward by this definition. >> >>The case you are most concerned about is the case where the pawn is on an open >>file and there is a protected blockade square in front of the pawn. >> >>This devalues a majority and leads to all kinds of positional hell. >> >>bruce
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