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a method of play typical in positions where white has pawns on a2, b2 and d4, whereas black has pawns on a7, b7, c6 and d5, the so-called [https://en.wikipedia.org/wiki/Carlsbad_1923_chess_tournament Carlsbad] Pawn Structure <ref>[http://www.webalice.it/costa.f/aperture/karlsbad_en.html Karlsbad pawn structure] from [http://www.webalice.it/costa.f/chess.html Francesco Costa's web page on chess]</ref>. Despite the fact that black nominally has a [[Pawn Majority|pawn majority]] on the queenside, white [[Attacks|attacks ]] by moving the b-pawn forward and organizing piece pressure along the c-file. Then either white plays b5xc6, weakening black c-pawn, or black plays c6xb5, opening the c-file and [[Isolated Pawn|isolating]] the d-pawn.