| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. L Dominguez vs M Heidenfeld |
 | 1-0 | 15 |
2000 |
34th Olympiad | C13 French |
| 27. M Heidenfeld vs I Morovic |
| 0-1 | 59 |
2000 |
34th Olympiad | B53 Sicilian |
| 28. Ilincic vs M Heidenfeld |
| 1-0 | 54 |
2000 |
34th Olympiad | E60 King's Indian Defense |
| 29. M Heidenfeld vs M Bengafer |
| 0-1 | 50 |
2001 |
open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 30. Nunn vs M Heidenfeld |
| ½-½ | 18 |
2001 |
4NCL | C10 French |
| 31. M Heidenfeld vs K Haznedaroglu |
| ½-½ | 22 |
2001 |
EuTCh | B33 Sicilian |
| 32. A Galkin vs M Heidenfeld |
| 1-0 | 39 |
2001 |
open | C11 French |
| 33. M Heidenfeld vs T Thorhallsson |
| 0-1 | 38 |
2001 |
ECC | C14 French, Classical |
| 34. M Heidenfeld vs S Zeidler |
| 1-0 | 64 |
2001 |
EuTCh | B01 Scandinavian |
| 35. K Kusnetsov vs M Heidenfeld |
| 0-1 | 42 |
2001 |
open | A92 Dutch |
| 36. M Heidenfeld vs C Crouch |
| ½-½ | 44 |
2001 |
4NCL | B03 Alekhine's Defense |
| 37. Vallejo-Pons vs M Heidenfeld |
| 1-0 | 32 |
2001 |
EuTCh | C00 French Defense |
| 38. M Heidenfeld vs N Ramezan |
| 1-0 | 87 |
2001 |
open | B27 Sicilian |
| 39. Stefansson vs M Heidenfeld |
| 1-0 | 33 |
2001 |
ECC | A96 Dutch, Classical Variation |
| 40. N Miezis vs M Heidenfeld |
| 1-0 | 28 |
2001 |
EuTCh | C01 French, Exchange |
| 41. M Heidenfeld vs M Abdullah |
| 0-1 | 67 |
2001 |
open | B32 Sicilian |
| 42. M Heidenfeld vs I Miladinovic |
 | 0-1 | 64 |
2001 |
EuTCh | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 43. S Chevannes vs M Heidenfeld |
| 0-1 | 59 |
2001 |
4NCL | A41 Queen's Pawn Game (with ...d6) |
| 44. M Heidenfeld vs C S Gokhale |
| ½-½ | 6 |
2001 |
open | C64 Ruy Lopez, Classical |
| 45. M Heidenfeld vs N Mitkov |
| 0-1 | 45 |
2001 |
ECC | B09 Pirc, Austrian Attack |
| 46. M Heidenfeld vs N Mitkov |
| ½-½ | 74 |
2001 |
EuTCh | B07 Pirc |
| 47. M Sadatnajafi vs M Heidenfeld |
| ½-½ | 66 |
2001 |
open | C91 Ruy Lopez, Closed |
| 48. J D Tisdall vs M Heidenfeld |
| ½-½ | 20 |
2001 |
ECC | D33 Queen's Gambit Declined, Tarrasch |
| 49. M Heidenfeld vs N Regan |
| 1-0 | 36 |
2001 |
4NCL | B02 Alekhine's Defense |
| 50. Al Argha,H vs M Heidenfeld |
| ½-½ | 10 |
2001 |
open | C13 French |