| 1564.4 | 1528.2 | 20 | 20 | Marais, N (Nina) | WUM | GSV | 1740.9 | 1740.2 | 2019 South African Closed Chess Championships (Women A) | 5 | 2019-12-11 | S | B | 0.5 | 0.25 | 0.25 | 5 | 0.21 | 0.29 | 5.8 |
| 1542.5 | 1546.3 | 20 | 20 | Marais, N (Nina) | WUM | GSV | 1680.5 | 1686.7 | 2018 Menlo Open Chess Tournament (A) | 1 | 2018-07-21 | S | B | 0 | 0.3 | -0.3 | -5 | 0.29 | -0.29 | -5.8 |
| 1632.1 | 1635.5 | 20 | 20 | Marais, N (Nina) | WUM | GSV | 1589.9 | 1583.7 | 2018 South African Junior Closed Chess Championships (U16 Girls) | 11 | 2018-04-07 | S | W | 0 | 0.59 | -0.59 | -11.8 | 0.6 | -0.6 | -12 |
| 1565.4 | 1565.4 | 20 | 20 | Marais, N (Nina) | WUM | GSV | 1657.4 | 1657.4 | South African Junior Team Championships 2017 (U16-U20 Girls) | 5 | 2018-01-06 | S | B | 0 | 0.35 | -0.35 | -7 | 0.35 | -0.35 | -7 |
| 1512 | 1512 | 20 | 20 | Marais, N (Nina) | WUM | GSV | 1518 | 1518 | Sa Junior Closed Chess Championship 2017 (U16 Girls) | 6 | 2017-04-08 | S | B | 0.5 | 0.49 | 0.01 | 0.2 | 0.01 | 0.49 | 9.8 |
| 1296 | 1296 | 20 | 20 | Marais, N (Nina) | WUM | GSV | 1473 | 1473 | Sa Junior Closed Chess Championship 2016 (U14 Girls) | 6 | 2016-03-23 | S | W | 0 | 0.27 | -0.27 | -5.4 | -0.27 | 0.27 | 5.4 |
| 1337 | 1337 | 20 | 20 | Marais, N (Nina) | WUM | GSV | 1376 | 1376 | Sa Junior Closed Chess Championship 2015 (Under 14 Girls) | 4 | 2015-04-06 | S | B | 1 | 0.45 | 0.55 | 11 | 0.55 | 0.45 | 9 |
| 1191 | 1191 | 20 | 20 | Marais, N (Nina) | | GSV | 1319 | 1319 | South African Junior Closed 2014 U12 Girls | 6 | 2014-04-02 | S | B | 0 | 0.33 | -0.33 | -6.6 | -0.33 | 0.33 | 6.6 |
| 1175 | 1175 | 20 | 20 | Marais, N (Nina) | | GSV | 1230 | 1230 | African Youth Chess Championships 2013 U12 Girls | 7 | 2013-10-14 | S | B | 0 | 0.42 | -0.42 | -8.4 | -0.42 | 0.42 | 8.4 |
| 1275 | 1275 | 20 | 20 | Marais, N (Nina) | | GSV | 1277 | 1277 | South African Junior Closed 2013 U12 Girls | 10 | 2013-04-06 | S | W | 1 | 0.5 | 0.5 | 10 | 0.5 | 0.5 | 10 |
