| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. P Marxen vs M Ghinda |
| 0-1 | 34 | 1979 | Saemisch Memorial | B81 Sicilian, Scheveningen, Keres Attack |
| 27. W Schmidt vs P Marxen |
| 1-0 | 75 | 1979 | Saemisch Memorial | A33 English, Symmetrical |
| 28. P Buecker vs P Marxen |
| 0-1 | 24 | 1986 | FRG-ch qual | C34 King's Gambit Accepted |
| 29. J Bruckner vs P Marxen |
| 1-0 | 20 | 1989 | corres GER | C36 King's Gambit Accepted, Abbazia Defense |
| 30. P Marxen vs S Haack |
| 1-0 | 12 | 1999 | Wichern Open | C47 Four Knights |
| 31. A Rustemov vs P Marxen |
| 1-0 | 39 | 1999 | Wichern Open | E67 King's Indian, Fianchetto |
| 32. P Marxen vs P van Hoolandt |
| ½-½ | 45 | 1999 | Wichern Open | C47 Four Knights |
| 33. A Nixdorf vs P Marxen |
| 0-1 | 35 | 1999 | Wichern Open | B86 Sicilian, Fischer-Sozin Attack |
| 34. P Marxen vs D Thalwitzer |
| 1-0 | 73 | 1999 | Wichern Open | B76 Sicilian, Dragon, Yugoslav Attack |
| 35. M M Ivanov vs P Marxen |
| 1-0 | 41 | 1999 | Wichern Open | E04 Catalan, Open, 5.Nf3 |
| 36. P Marxen vs N Andersson |
| 1-0 | 42 | 1999 | Wichern Open | B93 Sicilian, Najdorf, 6.f4 |
| 37. A Brustman vs P Marxen |
| 0-1 | 40 | 1999 | Wichern Open | B01 Scandinavian |
| 38. P Marxen vs O Jakobsen |
| 0-1 | 58 | 1999 | Wichern Open | B22 Sicilian, Alapin |
| 39. V Dambrauskas vs P Marxen |
| ½-½ | 21 | 2000 | Cuxhaven IM | E69 King's Indian, Fianchetto, Classical Main line |
| 40. P Marxen vs S Siebrecht |
| 0-1 | 43 | 2004 | Bundesliga 2004/05 | B22 Sicilian, Alapin |
| 41. G Kern vs P Marxen |
| 1-0 | 56 | 2004 | Bundesliga 0405 | A14 English |
| 42. P Marxen vs A Skripchenko |
| ½-½ | 48 | 2004 | Bundesliga 2004/05 | B22 Sicilian, Alapin |
| 43. P Marxen vs A Cao |
| 1-0 | 50 | 2004 | Travemuende Open | B32 Sicilian |
| 44. T Hentzgen vs P Marxen |
| ½-½ | 23 | 2004 | Travemuende Open | A24 English, Bremen System with ...g6 |
| 45. P Marxen vs S Patzer |
| ½-½ | 59 | 2004 | Travemuende Open | C40 King's Knight Opening |
| 46. G Just vs P Marxen |
| 1-0 | 27 | 2004 | Travemuende Open | A02 Bird's Opening |
| 47. G Hertneck vs P Marxen |
| 1-0 | 39 | 2005 | Bundesliga 2004/05 | E75 King's Indian, Averbakh, Main line |
| 48. P Marxen vs B Vujic |
| ½-½ | 78 | 2005 | Bundesliga 2004/05 | B01 Scandinavian |
| 49. P Marxen vs D Poldauf |
| ½-½ | 46 | 2005 | Bundesliga 2004/05 | C05 French, Tarrasch |
| 50. K Volke vs P Marxen |
| 1-0 | 39 | 2005 | Bundesliga 2004/05 | D58 Queen's Gambit Declined, Tartakower (Makagonov-Bondarevsky) Syst |
Kibitzing
