As we have seen in the example 3, the weakness of the rim pawn is especially expressed when the black king has not “crossed the Rubicon” on the fifth rank, in which case the rook can neutralize it through “cutting off” and preventing support for the pawn. However, the fatal can also be the hindering of the pawn behind the king because this can give a chance of gaining crucial tempi. In this position, analyzed by the famous theoretician R. Fine, the black king has already passed the fifth rank and is only the connection of pawns away from its rescue. Due to this particular detail the evaluation of the position depends on who is to move.
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