Bobby Fischer In July–August, Fischer crushed the mostly grandmaster field at Buenos Aires, winning by a 3½-point margin, scoring 15/17 (+13−0=4). Fischer then played first board for the US Team in the 19th Chess Olympiad in Siegen, where he won an individual Silver medal, scoring 10/13 (+8−1=4), with his only loss being to World Champion Boris Spassky. Right after the Olympiad, Fischer defeated Ulf Andersson in an exhibition game for the Swedish newspaper "Expressen". Fischer had taken his game to a new level. Fischer won the Interzonal (held in Palma de Mallorca in November and December 1970) with 18½/23 (+15−1=7), far ahead
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