| 838.9 | 828.8 | 20 | 20 | Van Der Westhuizen, GJH (Gerhardus) | | NBR | 1018.1 | 1011.7 | Fields College Open 2019 (U16) | 2 | 2019-02-02 | S | W | 0 | 0.33 | -0.33 | -5.5 | 0.33 | -0.33 | -6.6 |
| 960.2 | 956.8 | 20 | 20 | Van Der Westhuizen, GJH (Gerhardus) | | NBR | 955.5 | 950.9 | Laerskool Brits Tournament 2018 (U16) | 3 | 2018-08-04 | S | B | 0 | 0.46 | -0.46 | -7.6 | 0.47 | -0.47 | -9.4 |
| 960.2 | 956.8 | 20 | 20 | Van Der Westhuizen, GJH (Gerhardus) | | NBR | 955.5 | 950.9 | Laerskool Brits Tournament 2018 (U16) | 4 | 2018-08-04 | S | W | 0.5 | 0.55 | -0.05 | -0.8 | 0.55 | -0.05 | -1 |
| 863.3 | 866 | 20 | 20 | Van Der Westhuizen, GJH (Gerhardus) | | NBR | 819.7 | 827.8 | Inter Regional 2018 (U16 Individual) | 5 | 2018-05-05 | S | W | 1 | 0.59 | 0.41 | 6.8 | 0.59 | 0.41 | 8.2 |
| 659 | 659 | 20 | 20 | Van Der Westhuizen, Gjh (Gerhardus) | | NBR | 747 | 747 | Bojanala Regional Championship 2016 (U14) | 5 | 2016-10-15 | S | B | 1 | 0.38 | 0.62 | 10.3 | 0.62 | 0.38 | 7.6 |
| 659 | 659 | 20 | 20 | Van Der Westhuizen, Gjh (Gerhardus) | | NBR | 743 | 743 | Mountain Cambridge School Chess 2016 (U14) | 3 | 2016-09-10 | S | W | 0 | 0.38 | -0.38 | -6.3 | -0.38 | 0.38 | 7.6 |
| 601 | 601 | 20 | 20 | Van Der Westhuizen, Gjh (Gerhardus) | | NBR | 829 | 829 | Laerskool Brits 2016 (C) | 3 | 2016-05-21 | S | W | 1 | 0.21 | 0.79 | 13.1 | 0.79 | 0.21 | 4.2 |
| 579 | 579 | 20 | 20 | Van Der Westhuizen, Gjh (Gerhardus) | | NBR | 736 | 736 | South African Junior Championships 2015 Wild Card (12 Boys) | 6 | 2016-01-10 | S | B | 0 | 0.29 | -0.29 | -5.5 | -0.29 | 0.29 | 5.8 |
| 610 | 610 | 20 | 20 | Van Der Westhuizen, Gjh (Gerhardus) | | NBR | 789 | 789 | Grenville Nw Regionals (Under 12 (Born 2004 2005) | 5 | 2015-10-24 | S | W | 0 | 0.27 | -0.27 | -4.5 | -0.27 | 0.27 | 5.4 |
| 607 | 607 | 20 | 20 | Van Der Westhuizen, Gjh (Gerhardus) | | NBR | 731 | 731 | Lebone College (Section C (2003 2004 2005) | 3 | 2015-08-01 | S | B | 0 | 0.33 | -0.33 | -5.5 | -0.33 | 0.33 | 6.6 |
| 614 | 614 | 20 | 20 | Van Der Westhuizen, H (Hardus) | | NBR | 750 | 750 | Fields Open -U10 | 2 | 2013-07-20 | S | W | 0 | 0.32 | -0.32 | -5.3 | -0.32 | 0.32 | 6.4 |