The Berlin Wall VisibleForUsers true What variations of the Petrosian

What variations of the Petrosian System are covered

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The Berlin Wall VisibleForUsers true What variations of the PetrosianThe "Berlin Wall", also known as the "Berlin Defense", is one of the most solid and frequently played openings of the 21st century. It became popular after the World Championship match between Kramnik and Kasparov in London 2000, because it helped Kramnik to win the match and become world champion. Kramnik's choice of this variation signaled a departure from the dynamic and romantic style of the 20th century to a more pragmatic, defensive and long