The Berlin Wall - Viktor BologanThe Berlin Wall Viktor Bologan The Berlin Wall, also known as the Berlin Defense, is one of the most solid and frequently played openings of the 21st century, and compared to the real Berlin Wall, theres almost no chance of it falling. Introduced into serious practice during the WCC match between Kasparov and Kramnik in London in 2000, it heralded a change in chess from the dynamic and romantic style of the 20th century towards a more pragmatic,