Bobby Fischer Vs. Garry Kasparov - Sicilian Najdorf Defense (Part 1 of 5) - The Sicilian Najdorf is one of the sharpest openings in chess, demanding incredible energy and resourcefulness from both sides to maintain the balance in strongly double-edged positions. The Fischer-Sozin Attack with 6. Bc4 is well known as one of the most complicated lines in the Najdorf, as white immediately declares his aggressive intentions of controlling the critical d5 square and increasing the pressure on the a2-g8 diagonal. The line was originally patented in the early 20th century by the Russian player Veniamin Innokentevich Sozin, however Bobby Fischer's immense contributions to the development of theory in the 6. Bc4 variation earned him widespread recognition in the 1950s and 1960s. The Fischer-Sozin Attack is an extremely dangerous weapon for white against the Sicilian Najdorf and should definitely be taken seriously by Najdorf players of any level. The Fischer-Sozin Attack has been employed by many top grandmasters through the years, most notably by Bobby Fischer, Dragoljub Velimirovic, Liviu Nisipeanu, Andrei Volokitin, Nigel Short, and Sergei Rublevsky.