| 1338.1 | 1347.5 | 20 | 20 | Bosch, S (Septimus Bowker) | | FMB | 1229.3 | 1206.3 | Mangaung Metro Chess 6-7 February 2026 (B) | 2 | 2026-02-06 | S | B | 1 | 0.58 | 0.42 | 4.5 | 0.62 | 0.38 | 4.8 |
| 1215.2 | 1198.3 | 20 | 20 | Bosch, S (Septimus Bowker) | | FMB | 1230.4 | 1176.8 | Mzansi Interprovincial Youth Chess Championships 2024 (U12 Open Championship) | 7 | 2024-12-19 | S | B | 1 | 0.44 | 0.56 | 11.2 | 0.48 | 0.52 | 10.4 |
| 1230 | 1232.7 | 20 | 20 | Bosch, S (Septimus Bowker) | | FMB | 1150.2 | 1202.2 | Mangaung Metro Chess 10 February 2024 (C) | 2 | 2024-02-10 | R | W | 1 | 0.63 | 0.37 | 4.7 | 0.58 | 0.42 | 8.4 |
| 1220.7 | 1212.2 | 20 | 20 | Bosch, S (Septimus Bowker) | | FMB | 1166.8 | 1240.7 | Kings & Queens Chess 27 January 2024 (C) | 4 | 2024-01-27 | R | B | 1 | 0.52 | 0.48 | 6 | 0.43 | 0.57 | 11.4 |
| 1200 | 1200 | 20 | 20 | Bosch, S (Septimus Bowker) | | FMB | 1211.1 | 1214.8 | Kings & Queens Chess 21 January 2023 (D) | 5 | 2023-01-21 | R | W | 0 | 0.53 | -0.53 | -6.7 | 0.52 | -0.52 | -10.4 |
