William James Joseph Lombardy (December 4, 1937 – October 13, 2017) was an American chess grandmaster, chess writer, teacher, and former Catholic priest. He was one of the leading American chess players during the 1950s and 1960s, and a contemporary of Bobby Fischer, whom he seconded during the World Chess Championship 1972. He won the World Junior Chess Championship in 1957, the only person to win that tournament with a perfect score. Lombardy led the U.S. Student Team to Gold in the 1960 World Student Team Championship in Leningrad.
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