American Defeats World Chess King

American grandmaster Yasser Seirewan defeated world chess champion Gary Kasparov of the Soviet Union on Sunday in the 27th World Chess Olympiad.

The upset came when Kasparov resigned his adjourned game against Seirewan, 26, of Seattle. It was Kasparov’s first defeat since he successfully defended his world title in October against countryman Anatoly Karpov.

The United States and Hungary are tied for first place after seven rounds of play.