Rafael Duailibe Leitao vs Sergey Ionov
Hoogovens Group B Wijk aan Zee NED round 1 1999.01.19
Queen’s Indian Defense: Averbakh Variation 1/2-1/2

Sergei Vladimirovich Rublevsky vs Sergey Ionov
St.Petersburg op St. Petersburg RUS round 4 1994.02.??
Sicilian Defense: Taimanov Variation, Bastrikov Variation 1/2-1/2

Sergey Ionov vs Dmitry Bocharov
Chigorin mem open St. Petersburg RUS round 7 2001.10.01
Bogo-Indian Defense 1/2-1/2

Sergey Ionov vs Denis Yevseev
77th St. Petersburg Championship St Petersburg RUS round 1 2004.04.01
Queen’s Gambit Declined: Hastings Variation 1/2-1/2

Sergey Ionov vs Sergei Yuryevich Shipov
RUS-ch St. Petersburg RUS round 4 1998.07.??
Grünfeld Defense: Exchange Variation 1/2-1/2

Sergey Ionov vs Kent Angskog
Rilton Cup Stockholm SWE round 1 2009.12.27
Modern Defense 1-0

Sergey Ionov vs Christian Bauer
Hoogovens Group B Wijk aan Zee NED round 2 1999.01.20
Benoni Defense: Classical Variation 1/2-1/2

Vadim Zvjaginsev vs Sergey Ionov
RUS-ch St. Petersburg RUS round 1 1998.07.??
English Opening: Symmetrical Variation, Fianchetto Variation 1/2-1/2

Gleb Astashov vs Sergey Ionov
St Petersburg Championship St Petersburg RUS round 6 2005.03.22
English Opening: Symmetrical Variation 1-0