In a position with the black protected passed pawn on the fourth rank, White will win easily since he will have sufficient freedom of movement so as to back up the penetration of his pawns on the fifth rank. This position, with colours reversed, arose in the game Koch – Ahues, Berlin, 1928. At the moment the upper side of the common square of the white passed pawns barely touches the eighth rank; however, the white king is in a position to help them cross the “Rubicon”.
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