| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Mertanen vs B Jorgensen |
 | 1-0 | 26 | 2011 | European Club Cup | D32 Queen's Gambit Declined, Tarrasch |
| 27. J Mertanen vs S Gattenloehner |
| 1-0 | 70 | 2011 | European Club Cup | D12 Queen's Gambit Declined Slav |
| 28. J Mertanen vs A Kogan |
| 0-1 | 25 | 2011 | European Club Cup | E10 Queen's Pawn Game |
| 29. S Sulskis vs J Mertanen |
| 0-1 | 70 | 2012 | 22nd HOF Open | A30 English, Symmetrical |
| 30. J Mertanen vs H Van Der Heide |
| 1-0 | 35 | 2012 | 22nd HOF Open | D20 Queen's Gambit Accepted |
| 31. V Chernyak vs J Mertanen |
| 0-1 | 26 | 2012 | 22nd HOF Open | B00 Uncommon King's Pawn Opening |
| 32. J Mertanen vs M Ebeling |
| ½-½ | 69 | 2012 | 22nd HOF Open | D94 Grunfeld |
| 33. A Gavrilov vs J Mertanen |
| ½-½ | 130 | 2012 | 22nd HOF Open | A70 Benoni, Classical with 7.Nf3 |
| 34. J Mertanen vs P Laine |
| 1-0 | 30 | 2012 | 22nd HOF Open | D38 Queen's Gambit Declined, Ragozin Variation |
| 35. J Mertanen vs M Folkova |
| 1-0 | 32 | 2012 | Czech Open-A | D30 Queen's Gambit Declined |
| 36. B Lalith vs J Mertanen |
| ½-½ | 43 | 2012 | Czech Open-A | A33 English, Symmetrical |
| 37. J Mertanen vs L Gonda |
| ½-½ | 17 | 2012 | Czech Open-A | D11 Queen's Gambit Declined Slav |
| 38. J Mertanen vs T Pecha |
| 1-0 | 51 | 2012 | Czech Open-A | D11 Queen's Gambit Declined Slav |
| 39. M Kravtsiv vs J Mertanen |
| 1-0 | 26 | 2012 | Czech Open-A | C58 Two Knights |
| 40. J Mertanen vs L Le Ruyet |
| ½-½ | 48 | 2012 | Czech Open-A | A65 Benoni, 6.e4 |
| 41. W Sochacki vs J Mertanen |
| ½-½ | 60 | 2012 | Czech Open-A | B00 Uncommon King's Pawn Opening |
| 42. J Mertanen vs G Lorscheid |
| 1-0 | 32 | 2012 | Czech Open-A | D11 Queen's Gambit Declined Slav |
Kibitzing
