Semen Isaakovich Dvoirys vs Alexey Dreev
URS-ch56 Odessa URS round 6 1989.10.??
French Defense: Guimard Variation, Thunderbunny Variation 1/2-1/2

Semen Isaakovich Dvoirys vs Gyula Feher
Budapest Spring op 7th Budapest HUN round 4 1991.??.??
Sicilian Defense: Richter-Rauzer Variation, Classical Variation 1-0

Semen Isaakovich Dvoirys vs Gennadi Timoshchenko
URS-ch otbor56 Barnaul URS 1988.08.??
Ruy Lopez: Closed 1-0

Semen Isaakovich Dvoirys vs Ilya Yulyevich Smirin
URS-ch56 Odessa URS round 2 1989.09.??
Sicilian Defense: Richter-Rauzer Variation 1-0

Alexey Dreev vs Semen Isaakovich Dvoirys
URS-sf RUS-ch Gorky URS 1989.11.??
Grünfeld Defense: Exchange Variation, Classical Variation 0-1

Semen Isaakovich Dvoirys vs Andrei Sokolov
URS-ch56 Odessa URS round 13 1989.10.??
Sicilian Defense: Taimanov Variation 1/2-1/2

Maia Chiburdanidze vs Semen Isaakovich Dvoirys
URS-ch48 sf Tallinn 1980.08.??
Sicilian Defense: Najdorf Variation 1-0

Semen Isaakovich Dvoirys vs Vereslav Eingorn
URS-ch53 Kiev round 4 1986.04.??
French Defense: Guimard Variation, Thunderbunny Variation 1/2-1/2

Nicola Ambrosini vs Semen Isaakovich Dvoirys
17th Open Geneva SUI round 1 2001.01.20
Sicilian Defense: Closed 0-1

Sergei Zhigalko vs Semen Isaakovich Dvoirys
VIII Governor’s Cup Khanty-Mansiysk RUS round 2.7 2012.11.16
Sicilian Defense: Najdorf Variation 1/2-1/2