| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. K U Mueller vs H Platz |
| 0-1 | 46 | 1951 | East German Championship | E49 Nimzo-Indian, 4.e3, Botvinnik System |
| 27. H Hunte vs K U Mueller |
| 0-1 | 44 | 1951 | East German Championship | D47 Queen's Gambit Declined Semi-Slav |
| 28. K U Mueller vs A Zirngibl |
| 0-1 | 27 | 1951 | East German Championship | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 29. G Stein vs K U Mueller |
| ½-½ | 45 | 1951 | East German Championship | E67 King's Indian, Fianchetto |
| 30. K U Mueller vs R Schlieder |
| 1-0 | 39 | 1951 | East German Championship | E29 Nimzo-Indian, Samisch |
| 31. K Krause vs K U Mueller |
| ½-½ | 46 | 1951 | East German Championship | A43 Old Benoni |
| 32. R Kirchhammer vs K U Mueller |
| ½-½ | 29 | 1951 | East German Championship | A46 Queen's Pawn Game |
| 33. F Auer vs K U Mueller |
| ½-½ | 23 | 1952 | Helsinki Olympiad qual-2 | E10 Queen's Pawn Game |
| 34. O Cruz Filho vs K U Mueller |
| 0-1 | 61 | 1952 | Helsinki Olympiad qual-2 | E38 Nimzo-Indian, Classical, 4...c5 |
| 35. K U Mueller vs W Ramm |
| 1-0 | 38 | 1952 | Helsinki Olympiad qual-2 | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 36. T Florian vs K U Mueller |
| 1-0 | 58 | 1952 | Helsinki Olympiad qual-2 | D55 Queen's Gambit Declined |
| 37. K U Mueller vs G Primavera |
| ½-½ | 29 | 1952 | Helsinki Olympiad qual-2 | E80 King's Indian, Samisch Variation |
| 38. B Milic vs K U Mueller |
| 1-0 | 41 | 1952 | Helsinki Olympiad qual-2 | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 39. K U Mueller vs I Johansson |
| 0-1 | 45 | 1952 | Helsinki Olympiad qual-2 | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 40. N Cortlever vs K U Mueller |
| 1-0 | 41 | 1952 | Helsinki Olympiad Final-B | B54 Sicilian |
| 41. K U Mueller vs H Keller |
| 1-0 | 34 | 1952 | Helsinki Olympiad Final-B | E80 King's Indian, Samisch Variation |
| 42. E A Mandelbaum vs K U Mueller |
| ½-½ | 71 | 1952 | Helsinki Olympiad Final-B | E26 Nimzo-Indian, Samisch |
| 43. K U Mueller vs W Litmanowicz |
 | 1-0 | 32 | 1952 | Helsinki Olympiad Final-B | A54 Old Indian, Ukrainian Variation, 4.Nf3 |
| 44. G Primavera vs K U Mueller |
| 0-1 | 52 | 1952 | Helsinki Olympiad Final-B | E26 Nimzo-Indian, Samisch |
| 45. K U Mueller vs H Enevoldsen |
| 1-0 | 28 | 1952 | Helsinki Olympiad Final-B | D18 Queen's Gambit Declined Slav, Dutch |
| 46. D Horne vs K U Mueller |
| ½-½ | 36 | 1952 | Helsinki Olympiad Final-B | B54 Sicilian |
| 47. K U Mueller vs R Ortega |
| 1-0 | 42 | 1952 | Helsinki Olympiad Final-B | D47 Queen's Gambit Declined Semi-Slav |
| 48. K U Mueller vs B Koch |
| 0-1 | 44 | 1952 | GDR Championship (Play-off) | D99 Grunfeld Defense, Smyslov |
| 49. B Koch vs K U Mueller |
| 1-0 | 21 | 1952 | GDR Championship (Play-off) | B65 Sicilian, Richter-Rauzer Attack, 7...Be7 Defense, 9...Nxd4 |
| 50. K U Mueller vs B Koch |
| 1-0 | 54 | 1952 | GDR Championship (Play-off) | D85 Grunfeld |
Kibitzing
