| 1209.4 | 1207.2 | 20 | 20 | Van Der Westhuizen, PJ (Petrus) | | NBR | 1541 | 1544.7 | Inter Region 2019 (U18 Open) | 3 | 2019-10-19 | S | B | 0 | 0.07 | -0.07 | -1.2 | 0.07 | -0.07 | -1.4 |
| 1091.9 | 1114.2 | 20 | 20 | Van Der Westhuizen, PJ (Petrus) | | NBR | 1322.9 | 1325.6 | Laerskool Brits Tournament 2018 (U18) | 5 | 2018-08-04 | S | W | 0 | 0.27 | -0.27 | -4.5 | 0.3 | -0.3 | -6 |
| 889 | 889 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1187 | 1187 | Laerskool Rustenburg Noord Primary 2017 (U16) | 2 | 2017-08-11 | S | W | 0 | 0.15 | -0.15 | -2.5 | -0.15 | 0.15 | 3 |
| 784 | 784 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1159 | 1159 | Registration Tournament 2017 (U16) | 4 | 2017-01-27 | S | B | 0 | 0.09 | -0.09 | -1.5 | -0.09 | 0.09 | 1.8 |
| 801 | 801 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1159 | 1159 | Bojanala Regional Championship 2016 (U16) | 1 | 2016-10-15 | S | W | 0 | 0.1 | -0.1 | -1.7 | -0.1 | 0.1 | 2 |
| 991 | 991 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1232 | 1232 | Bojanala Registration 2016 (U16) | 5 | 2016-01-30 | S | B | 0 | 0.2 | -0.2 | -3.3 | -0.2 | 0.2 | 4 |
| 977 | 977 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1269 | 1269 | 2015 Fields Chess Tournament (Under 14 (Born 2002 2003) | 3 | 2015-08-15 | S | W | 0 | 0.15 | -0.15 | -2.5 | -0.15 | 0.15 | 3 |
| 864 | 864 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1094 | 1094 | 2014 Laerskool Proteapark (U 14) | 5 | 2014-08-30 | S | W | 0 | 0.21 | -0.21 | -3.5 | -0.21 | 0.21 | 4.2 |
| 806 | 806 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1136 | 1136 | Grenville Chess U14 | 5 | 2014-08-16 | S | B | 0 | 0.12 | -0.12 | -2 | -0.12 | 0.12 | 2.4 |
| 814 | 814 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1097 | 1097 | Lebone Ii U14 | 5 | 2014-05-31 | S | W | 0 | 0.16 | -0.16 | -2.7 | -0.16 | 0.16 | 3.2 |
| 925 | 925 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1096 | 1096 | Baillie Park U14 | 2 | 2013-11-23 | S | B | 0 | 0.27 | -0.27 | -4.5 | -0.27 | 0.27 | 5.4 |
| 970 | 970 | 20 | 20 | Van Der Westhuizen, Pj (Petrus) | | NBR | 1126 | 1126 | Fields Open -U12 | 5 | 2013-07-20 | S | W | 1 | 0.29 | 0.71 | 11.8 | 0.71 | 0.29 | 5.8 |
| 894 | 894 | 20 | 20 | Van Der Westhuizen, J (Jeremy) | | NBR | 1097 | 1097 | Malichri Open Under 12 | 3 | 2013-01-26 | S | W | 0 | 0.24 | -0.24 | -4 | -0.24 | 0.24 | 4.8 |
