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He won the blades final, shearing four lambs in 11min 42.4sec and scoring 43.37 points to head off Phil Oldfield, of Geraldine (12min 3.47sec, 46.6735pts).
Oldfield's son Allan Oldfield was the quickest of the three, with a time of 11min 20.93sec, but had to be content with third on 48.29 points.
Dobbs and Allan Oldfield are now setting their sights on the 2019 world championships to be held in Le Dorat, France, in two months time.
Dobbs will be aiming to go one better in France, after finishing runner-up in the 2017 world championships in Invercargill in which Phil Oldfield placed third.
Meanwhile, Wairarapa shearer David Buick successfully defended his national open lamb shearing title at the Mackenzie show.
It confirmed him as the top competition lambshearer in New Zealand. He has now had three successive wins in the top lamb final competitions - at Fairlie last year, in the national crossbred lambs final at Winton in January, and at Fairlie again at Easter when he won by more than two and a-half points from runner-up and fellow national team member, Nathan Stratford, of Invercargill.
Third place went to Pleasant Point shearer Ant Frew, who had shorn at the Royal Easter Show in Auckland on Saturday two days before the Fairlie show, competing for South against North.
South with 91.24 points (Frew 12min 30sec, 47.17pts; Leon Samuels 11min 33sec, 44.07pts) beat North 98.28pts (Michael Fabish 11min 53sec, 47.99pts and Matene Mason 13min 4sec, 50.29pts).
Frew's fellow Pleasant Point shearer Eli Cummings was fourth in Fairlie.