| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Mangini vs B Gustavson Detthow |
| 1-0 | 18 | 1962 | Brazilian Championship | D62 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 27. B Gustavson Detthow vs J Lacerda Guimaraes |
| 1-0 | 41 | 1962 | Brazilian Championship | D04 Queen's Pawn Game |
| 28. S Farias vs B Gustavson Detthow |
| ½-½ | 38 | 1962 | Brazilian Championship | D50 Queen's Gambit Declined |
| 29. B Gustavson Detthow vs F Alves |
| ½-½ | 37 | 1962 | Brazilian Championship | E81 King's Indian, Samisch |
| 30. B Gustavson Detthow vs G Seabra |
| 1-0 | 45 | 1962 | Brazilian Championship | D45 Queen's Gambit Declined Semi-Slav |
| 31. F Trois vs B Gustavson Detthow |
| 1-0 | 24 | 1964 | South Brazilian Zonal Tournament | B77 Sicilian, Dragon, Yugoslav Attack |
| 32. B Gustavson Detthow vs E Stenzel |
| 1-0 | 48 | 1964 | South Brazilian Zonal Tournament | D00 Queen's Pawn Game |
| 33. L Holzmann vs B Gustavson Detthow |
| ½-½ | 50 | 1964 | South Brazilian Zonal Tournament | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 34. B Gustavson Detthow vs D Lazzarini |
| 0-1 | 33 | 1964 | South Brazilian Zonal Tournament | D00 Queen's Pawn Game |
| 35. S L Teixeira Mendes vs B Gustavson Detthow |
| 1-0 | 62 | 1964 | South Brazilian Zonal Tournament | A38 English, Symmetrical |
| 36. A da Nobrega vs B Gustavson Detthow |
| 1-0 | 44 | 1964 | South Brazilian Zonal Tournament | A01 Nimzovich-Larsen Attack |
| 37. B Gustavson Detthow vs L R Borges |
| 0-1 | 38 | 1964 | South Brazilian Zonal Tournament | A54 Old Indian, Ukrainian Variation, 4.Nf3 |
| 38. T Muniz vs B Gustavson Detthow |
| 0-1 | 52 | 1964 | South Brazilian Zonal Tournament | A07 King's Indian Attack |
| 39. B Gustavson Detthow vs J B Mello |
| 1-0 | 54 | 1964 | South Brazilian Zonal Tournament | E81 King's Indian, Samisch |
| 40. B Gustavson Detthow vs M E de Freitas |
| 0-1 | 41 | 1964 | South Brazilian Zonal Tournament | E26 Nimzo-Indian, Samisch |
| 41. R Alvarenga vs B Gustavson Detthow |
| 1-0 | 60 | 1964 | South Brazilian Zonal Tournament | B76 Sicilian, Dragon, Yugoslav Attack |
Kibitzing
