| 1344.7 | 1340.8 | 36 | 36 | Bosch, S (Septimus Bowker) | | FMB | 1281.4 | 1281.7 | Inter Regional Chess Championship 2026 (Team U14) | 1 | 2026-05-22 | S | W | 1 | 0.62 | 0.38 | 11.6 | 0.61 | 0.39 | 14 |
| 1308.3 | 1294.1 | 20 | 20 | Bosch, S (Septimus Bowker) | | FMB | 1233.1 | 1227.9 | 11th Piet van Zyl Chess Festival 2025 (B) | 3 | 2025-10-11 | S | W | 0 | 0.63 | -0.63 | -10.6 | 0.62 | -0.62 | -12.4 |
| 1310.4 | 1295.8 | 20 | 20 | Bosch, S (Septimus Bowker) | | FMB | 1222.9 | 1217.3 | Free State Closed 2025 (U14 Open) | 5 | 2025-08-15 | S | B | 1 | 0.56 | 0.44 | 8.3 | 0.55 | 0.45 | 9 |
| 1251.3 | 1226.6 | 20 | 20 | Bosch, S (Septimus Bowker) | | FMB | 1199.3 | 1157 | Mangaung Metro Chess 7-8 March 2025 (B) | 2 | 2025-03-07 | S | W | 1 | 0.6 | 0.4 | 6.7 | 0.62 | 0.38 | 7.6 |
