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| Full name | Semyon Isaakovich Dvoirys |
|---|---|
| Country | Russia |
| Born | 2 November 1958 Zhmerynka, Ukrainian SSR, Soviet Union |
| Title | Grandmaster (1990) |
| Peak rating | 2615 (October 2004) |
Semyon Isaakovich Dvoirys (Russian: Семён Исаакович Двойрис; born 2 November 1958) is a Russian chess Grandmaster.
In 2000, he took part in the first Karpov Poikovsky Tournament, a category 14 round-robin tournament: he scored 3.5 points out of 9 games, tying for the seventh place.
In 2001, he tied for 1st-2nd with Alexey Korotylev at Geneva Open. In 2010, he won the Izmailov Memorial in Tomsk and tied for 1st-4th with Sergei Yudin, Pavel Smirnov and Sergei Iskusnyh at Pavlodar. In 2011 he came first in the Lev Polugaevsky Memorial in Chelyabinsk.
Dvoirys helped Russia 1 team to win gold at the 2014 European Senior Team Chess Championship in Sibenik, scoring 6.5/9 on first board.