| Tournament | Round | Bertha Williams | Maria Boekelman |
| 31.05.1998 Melville (WA) | 2 | 273 | 277 |
| 02.08.1998 Bassendean (WA) | 2 | 328 | 421 |
| 20.09.1998 Advanced Intermediate Recreation (WA) | 5 | 344 | 303 |
| 21.10.2001 Rockingham (WA) | 2 | 324 | 264 |
| Head-to-head after 4 games | 2 | 2 | |
| Average score | 317.25 | 316.25 | |
| Spread: | 4 | -4 | |