King's Gambit, Fischer Defense King's Gambit, Fischer Defense The Fischer Defense to the King's Gambit is a chess opening variation that begins with the moves: Although 3...d6 was previously known, it did not become a major variation until Fischer advocated it in a famous 1961 article in the first issue of the "American Chess Quarterly". In the "Encyclopaedia of Chess Openings", the Fischer Defense is given the code C34. After Bobby Fischer lost a 1960 game at Mar del Plata to Boris Spassky, in which Spassky played the Kieseritzky Gambit, Fischer left in tears and promptly went to work at devising a new defense
Bobby Fischer Teaches Chess the work". According to Margulies, Fischer wanted a high quality work free of any errors, so Michael Valvo and Raymond Weinstein were brought in as proof readers. Chiefly due to its accessibility for beginners and Fischer's high public profile, the book sold an estimated one million copies. It is difficult to determine chess book sales with certainty, but this figure, based on the royalty payments made to co-author Stuart Margulies, makes it a candidate for best-selling chess book of all time. In October 1972, following Fischer's victory in the World Championship, the Bantam edition appeared on the New York Times