The fortress breaker

3/11/2010 – It is frequently anything but easy to make the material superiority of a rook over a bishop tell when all the pawns are on one side of the board. Last month we showed you a game with reduced material in which zugzwang brought about the decision. Today we follow that with an example with more pawns, in which White has to find access to a black fortress that is hard one to storm. The siege had already lasted for over twenty moves before White turned to radical measures with 55.f5!? GM Karsten Müller demonstrates how the game was decided and what additional defensive resources Black had. ChessBase Magazine Online.