Isolated pawns are more unfavourable for Black: for instance f- and h-pawns, as a rule, lose easily against the connected f-g-h pawns. Exceptions are possible only in case of a blockade and when the more active black king can penetrate amidst the white pawns. In this study by H. Walker’s, published in 1841, Black’s king is very active; his chances of drawing are based on breaking up the white pawn structure with f4.
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