Isaak Mazel vs S Tanin
Ch URS (1/2 final) Moscow URS 1931.??.??
Colle System: Rhamphorhynchus Variation 1-0

Sergey Nikolaevich von Freymann vs Isaak Mazel
Ch URS (1/2 final) Moscow URS 1931.??.??
French Defense: Burn Variation 1/2-1/2

Isaak Mazel vs Nikolay Tikhonovich Sorokin
USSR Championship Moscow URS round 11 1931.11.04
Nimzo-Larsen Attack: Classical Variation 0-1

Victor Andreevich Vasiliev vs Isaak Mazel
Trade Unions Leningrad round 18 1938.??.??
Neo-Grünfeld Defense: Classical Variation, Original Defense 0-1

Alexey Sokolsky vs Isaak Mazel
Trade Unions Championship Moscow (URS) 1936.01.??
Queen’s Gambit Declined: Alapin Variation 0-1

Vladimir Grigorevich Kirillov vs Isaak Mazel
USSR Championship Moscow URS round 8 1931.10.31
French Defense 0-1

Isaak Mazel vs Nikolai Nikolaevich Riumin
USSR Championship Moscow URS round 7 1931.10.30
English Opening: King’s English Variation, Three Knights System 1/2-1/2

Fedor Parfenovich Bohatirchuk vs Isaak Mazel
USSR Championship Moscow URS round 4 1931.10.27
Colle System: Rhamphorhynchus Variation 0-1

Isaak Mazel vs Boris Verlinsky
USSR Championship Moscow URS round 1 1931.10.24
Nimzo-Larsen Attack: Classical Variation 0-1

Isaak Mazel vs Evgeny Zagorjansky
21st Moscow Championship Moscow URS 1941.??.??
Queen’s Gambit Declined: Been-Koomen Variation 1-0