Yakov Estrin

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Yakov Borisovich Estrin (April 21, 1923, Moscow –February 2, 1987) was a Russian chess International Grandmaster and theoretician.

After a brief foray into over-the-board play, he turned to correspondence chess in the early 1960's with immediate success (joint first place in the U.S.S.R. Correspondence Championship in 1962.) He became a CGM (Correspondence Grandmaster) in 1966, and would go on to compete in the final of the World Correspondence Championship five times. He is the most famous for being the seventh ICCF World Champion in correspondence chess between 1972 and 1976.

In 1984, he was awarded the "over the board" Grandmaster title.