Queensland 342 and 8 for 285 dec (Labuschagne 62, Peirson 51*, Winter 3-55) lead South Australia 162 & 4 for 82 (Weatherald 28, Dalton 23, Doggett 4-32) by 384 runs
Queensland is on the verge of going a game clear on top of the Sheffield Shield table after the Bulls quicks dismantled South Australia's top order in the Redbacks unlikely pursuit of 466 for victory.
Redbacks openers Jake Weatherald and John Dalton made a solid start moving to 51 without loss before the home side suffered another collapse similar to the first innings. They lost 3 for 6 in four overs with Luke Feldman, Brendan Doggett and Michael Neser all claiming a wicket each.
Doggett also picked up Jake Lehmann late in the day to send a dagger through the heart of the Redbacks line-up.
Earlier, the Bulls got contributions all through their order to give the Redbacks a huge fourth innings total to chase. Marnus Labuschagne top scored with 62 while skipper Jimmy Peirson made 51 not out. Michael Neser and Mitchell Swepson made valuable contributions to extend the chase to 466.