The pawn majority is at its most dangerous when through breakthrough a “rim” passed pawn may be created. An excellent example of the superiority of the “rim” passed pawn over the distant passed pawn was elaborated by N. Grigoriev in a study published in 1934. White to move wins since by the threat of the creation of a passed a-pawn he can completely paralyze his opponent. However, the win is not simple since Black’s unexpected defence by stalemate has to be prevented as well.
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