| Date | Tournament | State | 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 | |||