Jaan Ehlvest (born 14 October 1962) is an Estonian-American chess player. He was awarded the title Grandmaster by FIDE in 1987. Ehlvest was Estonian champion in 1986. Since 2006, he has represented the United States.
In 2006, unsatisfied with the lack of support from the Estonian Chess Federation, Ehlvest decided to move to the United States; since then, he has been a member of the USCF and competed internationally for the US.[7]
In March 2007, Ehlvest accepted an invitation to play an eight-game match against the chess program Rybka, one of the strongest chess programs in existence. He was playing Black in all games, but was given pawn odds (Rybka was playing each game a pawn down; a different white pawn was removed in each game). He lost the match by 2½:5½ (+1−4=3). In a following rematch, the pawn odds were removed, Ehlvest was given White in every game, twice the time on the clock, and significant computational handicaps were placed on the machine. Ehlvest lost decisively, 1½:4½.
Ehlvest's younger brother, Jüri Ehlvest, was a well-known writer in Estonia.
Ehlvest studied psychology at Tartu State University (now, University of Tartu). In 2004, Ehlvest published his autobiography, The Story of a Chess Player. While U.S. citizen, he spends most of his time in Estonia.