| Tournament | Round | Betty Mitchell | Gillian Briggs |
| 23.03.2001 South Australian Championships (SA) | 7 | 329 | 427 |
| 28.12.2007 SA Christmas Leftovers (SA) | 5 | 309 | 469 |
| 14.11.2009 Southern Tournament (SA) | 3 | 374 | 396 |
| 07.02.2010 SA February (SA) | 4 | 427 | 290 |
| Head-to-head after 4 games | 1 | 3 | |
| Average score | 359.75 | 395.5 | |
| Spread: | -143 | 143 | |