| Tournament | Round | Trevor Tao | Karen Richards |
| 13.06.2011 Victorian Championship (VIC) | 11 | 355 | 399 |
| 02.09.2012 Australian Masters and State Team Challenge (NSW) | 14 | 451 | 458 |
| 10.03.2013 SA Championship (SA) | 3 | 391 | 473 |
| 08.03.2014 SA Championship (SA) | 7 | 411 | 465 |
| 08.03.2015 SA Championship (SA) | 9 | 403 | 375 |
| 07.08.2016 TRANS TASMAN (SA) | 17 | 400 | 398 |
| 10.09.2017 AMSC 2017 (SA) | 11 | 412 | 346 |
| 11.03.2023 SA Scrabble Champs (SA) | 7 | 427 | 351 |
| 09.03.2024 SA CHAMPS 2024 (SA) | 16 | 452 | 407 |
| Head-to-head after 9 games | 5 | 4 | |
| Average score | 411.33 | 408 | |
| Spread: | 30 | -30 | |