| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. V Milov vs I Papaioannou |
| ½-½ | 44 |
2001 |
EuTCh | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 2. Z Sturua vs I Papaioannou |
| ½-½ | 28 |
2001 |
EuTCh | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 3. Van Wely vs I Papaioannou |
| 1-0 | 97 |
2002 |
Bled Olympiad | E53 Nimzo-Indian, 4.e3 |
| 4. Zhu Chen vs I Papaioannou |
| 1-0 | 63 |
2003 |
Easter in Crete Rapid m | E32 Nimzo-Indian, Classical |
| 5. Zhu Chen vs I Papaioannou |
| 1-0 | 39 |
2003 |
Easter in Crete Rapid m | E38 Nimzo-Indian, Classical, 4...c5 |
| 6. Barsov vs I Papaioannou |
| ½-½ | 23 |
2006 |
37th Chess Olympiad | E21 Nimzo-Indian, Three Knights |
| 7. A Mastrovasilis vs I Papaioannou |
| ½-½ | 21 |
2006 |
35th Greek Team Championship | E21 Nimzo-Indian, Three Knights |
| 8. Kamsky vs I Papaioannou |
| ½-½ | 46 |
2008 |
2008 Olympiad | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 9. I Ivanisevic vs I Papaioannou |
| ½-½ | 24 |
2009 |
17th European Team Championship | E32 Nimzo-Indian, Classical |