At Mackey Park, Tempe and also at Royal Sydney Golf Club. Probably 4 qualifying blocks followed by a best-of-3 knockout, plus consolation events.
https://portal.revolutionise.com.au/cnsw/events/319519

NSW GC Open Singles Championship

Green plate block

Wins Losses Net
Hoops
#
Alexander Michalak (Newcastle National Park) 3 0 +8 1
Richard Christian (Royal Sydney Golf Club) 2 1 +2 2
Gerda Lambeck (Canberra) 1 2 +1 3
Sandy Tawa (Nelson Bay) 0 3 -11 4
Andrew Bissex (Forster) withdrawn 0 0 0

Ranked by the share of matches won. A tournament's own regulations may place its players otherwise.