Of special interest are positions where Black has a strong, protected passed pawn which restrains the white king’s mobility. Let us first examine a position where White has two connected pawns. Such positions are generally drawn unless White can manage to bring at least one of his pawns to the sixth rank. Then at the right moment the white king will leave the enemy pawn’s square in order to support a mating attack. A border-line case where this is still possible is shown in a study by B. Horwitz and J. Kling, published in 1851.
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