Bisguier. Byrne did not play in his first U.S. Chess Championship until age 30 in 1958–59, placing tied 9–10th with 4/11; the winner was Bobby Fischer. But Byrne improved dramatically the next year in the same event to place 2nd with 8/11, ahead of Reshevsky and Pal Benko, as Fischer won again. In 1960, Byrne increased his serious play, winning the U.S. Open Chess Championship at St. Louis, and taking a silver medal on third board at the Olympiad in Leipzig. A poor result of 8–11th places in the U.S. Championship 1960–61, with only 4½/11, was balanced by his fine tied 2nd–5th places at Mar del Plata 1961 with 11½/15, behind winner Miguel Najdorf. On that same South American trip, he dominated a small but strong event at Santa Fe with 6½/7, ahead of Miroslav Filip, Aleksandar Matanović, and Héctor Rossetto. In the U.S. Championship of 1961–62, he tied for 2nd–3rd places on 7/11, half a point behind Larry Evans. He placed 6th in the U.S. Championship 1962–63 with 6/11, as Fischer won again. In the U.S. Championship 1963–64 he again placed 6th with 5½/11, as Fischer defeated Byrne brilliantly in 21 moves and won the tournament with a perfect score. Of his game against Fischer, Byrne wrote: "The culminating combination is of such depth that, even at the very moment at which I resigned, both grandmasters who were commenting on the play for the spectators in a separate room believed I had a won game!" In 1964, Byrne's third-place finish at the Buenos Aires tournament (behind Paul Keres and World Champion Tigran Petrosian), with 11½/17, made him an International Grandmaster. Byrne shared 2nd–3rd places in the U.S. Championship 1965–66 with 7½/11; Fischer won again, but Byrne defeated Fischer in their individual game. He shared the 1966 U.S. Open title with Pal Benko at Seattle. He scored 4½/11 for a shared 8–10th place, in the U.S. Championship 1966–67, with Fischer winning. Byrne qualified for his first Interzonal tournament, Sousse 1967, but scored just 7½/22, far short of advancing. U.S. Champion, Candidate By the late 1960s, he was playing chess semi-professionally. He won the 1972 U.S. Championship; after tying with Samuel Reshevsky and Lubomir Kavalek in the tournament proper, Byrne won the 1973 playoff at Chicago. Byrne achieved his career highlight of third place at the Leningrad Interzonal in 1973, with 12½/17, which made him only the fourth American (after Samuel