| 1553 | 1545.9 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1617.4 | 1612.6 | Ekurhuleni 1st Standard Tournament 2026 (B) | 5 | 2026-02-14 | S | B | 0 | 0.38 | -0.38 | -6.3 | 0.38 | -0.38 | -7.6 |
| 1553 | 1545.9 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1617.4 | 1612.6 | MCA Tshwane Welcome 2026 (B) | 4 | 2026-01-24 | S | W | 0.5 | 0.47 | 0.03 | 0.3 | 0.46 | 0.04 | 0.4 |
| 1550.8 | 1560.8 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1621.9 | 1624.1 | LS Fonteine Open 18 Oct 2025 (B+C) | 5 | 2025-10-18 | S | B | 0 | 0.38 | -0.38 | -6.3 | 0.38 | -0.38 | -7.6 |
| 1453.1 | 1454.5 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1542.3 | 1549.1 | HS Driehoek Chess Open 2025 (A+B) | 3 | 2025-06-14 | S | W | 1 | 0.44 | 0.56 | 9.3 | 0.43 | 0.57 | 11.4 |
| 1453.1 | 1454.5 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1542.3 | 1549.1 | GDE (D8) Sedibeng West Schools Individuals 2025 (U18 Boys) | 5 | 2025-06-07 | S | W | 0.5 | 0.44 | 0.06 | 1 | 0.43 | 0.07 | 1.4 |
| 1453.1 | 1199.7 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1542.3 | 948.2 | Vaal Chess Club Blitz Open 31 May 2025 (A) | 3 | 2025-05-31 | B | B | 0 | 0.35 | -0.35 | -1.7 | 0.75 | -0.75 | -15 |
| 1488.9 | 1491.9 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1475.9 | 1529.4 | Sedibeng Chess Open 07 Sept 24 (B) | 4 | 2024-09-07 | S | B | 0 | 0.47 | -0.47 | -7.8 | 0.41 | -0.41 | -8.2 |
| 1509.6 | 1200 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1508.8 | 1138.1 | Midvaal Winter Classic 13 July 2024 (C) | 1 | 2024-07-13 | R | W | 1 | 0.54 | 0.46 | 5.5 | 0.61 | 0.39 | 7.8 |
| 1448.8 | 1440.9 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1498.2 | 1488.5 | AG Visser Open 2024 (B) | 4 | 2024-06-08 | S | B | 1 | 0.4 | 0.6 | 10 | 0.4 | 0.6 | 12 |
| 1344.6 | 1337 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1494.2 | 1481.5 | Sedibeng Chess Open 11 May 2024 (U15) | 3 | 2024-05-11 | S | B | 1 | 0.28 | 0.72 | 12 | 0.29 | 0.71 | 14.2 |
| 1311.6 | 1266.6 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1468.6 | 1449.3 | Fonteine Chess Open 2023 (C) | 4 | 2023-09-02 | S | B | 0 | 0.28 | -0.28 | -4.6 | 0.25 | -0.25 | -5 |
| 1254.5 | 1200 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1365.4 | 1011.3 | VaalPark Primary Open Chess 2023 (B) | 4 | 2023-06-16 | R | B | 1 | 0.33 | 0.67 | 9.9 | 0.68 | 0.32 | 6.4 |
| 1145.9 | 1133.2 | 20 | 20 | Mittermaier, G (Gunther) | | GSV | 1354.5 | 1347 | D8 Schools Individuals 2023 (U15 Boys) | 3 | 2023-05-20 | S | W | 1 | 0.3 | 0.7 | 11.6 | 0.29 | 0.71 | 14.2 |
