| Tournament | Round | Betty Irwin | Joan Buchanan |
| 05.12.1999 ACT Christmas Capers (ACT) | 1 | 290 | 357 |
| 21.05.2000 Ulladulla (NSW) | 13 | 361 | 381 |
| 24.11.2002 ACT Championships (ACT) | 10 | 286 | 340 |
| 22.05.2005 Ulladulla (NSW) | 8 | 330 | 387 |
| 17.06.2005 Wollongong Marj Babb (NSW) | 2 | 378 | 354 |
| 21.02.2006 Ulladulla SUmmer Games Tuesday (NSW) | 2 | 340 | 348 |
| 28.05.2006 Ulladulla Championship (NSW) | 1 | 328 | 402 |
| Head-to-head after 7 games | 1 | 6 | |
| Average score | 330.42 | 367 | |
| Spread: | -256 | 256 | |