Jaan Yukhanovich Ehlvest vs Johann Hjartarson
Reykjavik World Cup Reykjavik ISL round 14 1988.10.20
Catalan Opening: Closed 1/2-1/2

Johann Hjartarson vs Jeroen Piket
Interpolis 13th Tilburg NED round 2 1989.09.16
Catalan Opening: Open Defense 1-0

Johann Hjartarson vs Viktor Korchnoi
Candidates Match Saint John CAN round 1 1988.01.24
Ruy Lopez: Open, Breslau Variation 1-0

Alexander Moiseenko vs Johann Hjartarson
World Rapid Championship Berlin GER round 3.37 2015.10.10
King’s Indian Defense: Four Pawns Attack 1-0

Johann Hjartarson vs Luka Skuhala
Pro Chess League chess.com INT round 3 2018.01.31
Nimzo-Indian Defense: Normal Line 0-1

Artur Yusupov vs Johann Hjartarson
Munich Munich GER round 7 1993.05.??
Nimzo-Indian Defense: Normal Variation, Bernstein Defense, Exchange Line 1-0

Johann Hjartarson vs Alexander Beliavsky
Linares Linares ESP round 4 1988.02.27
English Opening: Agincourt Defense 1/2-1/2

Sarunas Sulskis vs Johann Hjartarson
Groningen Candidates Groningen NED round 1.2 1997.12.10
Ruy Lopez: Closed, Breyer 1/2-1/2

Lajos Portisch vs Johann Hjartarson
Reykjavik World Cup Reykjavik ISL round 3 1988.10.05
Bogo-Indian Defense 1-0

Johann Hjartarson vs Evgenij Romanovich Agrest
Pro Chess League chess.com INT round 5 2018.02.07
Semi-Slav Defense: Accelerated Meran Variation 1-0