Mitchell Pearce kicked an overtime field goal as Sydney Roosters cut the gap at the top with a golden-point win over NRL leaders Melbourne Storm.
Trent Robinson's side reduced Melbourne's advantage to only two points with Saturday's 25-24 win at Adelaide Oval, having forced additional time with late tries from Daniel Tupou and Blake Ferguson.
It looked as though the Storm - deprived of the services of Queensland stars Cameron Smith, Cooper Cronk, Billy Slater and Will Chambers - would earn extra breathing space at the summit after two tries from Josh Addo-Carr and one apiece from youngster Brodie Croft and Jahrome Hughes.
But the Roosters, who led early on through Mitchell Aubusson, had made headway of their own courtesy of Latrell Mitchell before Michael Gordon coolly added the extras to the four-pointers of Tupou and Ferguson to level it up.
Craig Bellamy's Storm prevailed when their last outing went to extra time against North Queensland Cowboys, but a different story unfolded this time.
Within five minutes Pearce seized his chance to steer a precise kick between the posts to cap a thrilling match that is sure to have captured the Adelaide public's imagination after the South Australian government bought the rights to host it.
Brisbane Broncos also took advantage of the leaders' demise with a 30-20 victory over Canberra Raiders - moving within four points of the summit.
Benji Marshall laid on two try assists as the Broncos recovered from a half-time deficit against the struggling Raiders, who have now lost three on the bounce.
Matt Gillett touched down twice in a much-improved second-half from the visitors at GIO Stadium.
The Cowboys shrugged off the absence of shoulder injury victim Johnathan Thurston to claim a dramatic late win over Penrith Panthers.
Kyle Feldt's last-gasp try was nervelessly converted by stand-in goalkicker Ethan Lowe to wrap up a 14-12 success for the hosts at 1300Smiles Stadium.