Derry City got the bragging rights as they all but condemned rivals Finn Harps to the First Division.
A second half brace from Rory Patterson added to Ronan Curtis' first half strike ensured the Candystripes cruised to victory
In what was a disappointing first half were City was the only side really trying to win the game and Rory Patterson went close on 18 minutes but his drive was deflected wide.
The deadlock was broken moments as some good determined play by Ronan Curtis saw him win possession from Damien McNulty on the half-way line before running clear and his left footed strike caught out Harps keeper Ciaran Gallagher.
Just after the half-hour mark Aaron McEneff saw his 25 yard curling effort, which had Gallagher beaten, sail just wide. City ended the game as a contest as Patterson netted twice in the space of just eight minutes after the break.
Firstly good play by Curtis on 55 minutes ended with is cut-back find the Strabane man, who fired into the empty net.
Patterson added his second on 63 minutes as he made no mistake heading home from close range after Ben Doherty's centre picked out the striker.
Both sides had chances in after Patterson's goal with McNulty seeing his header saved by City keeper Gerard Doherty and Curtis saw his effort cleared off the line by Ciaran Coll.
Derry City: G Doherty, McDermott, Cole, Barry, B Doherty; Monaghan (Tweed 73), McNamee, McEneff; Schubert (Boyle 71), Patterson (McBride 84), Curtis.
Finn Harps: Gallagher, McNulty, Cantwell, Mailey, Coll; McAleer, McBride (Bonner 60), Houston (Keita 65), Harkin; Dsane (Banda 54), Morrissey.
Referee: Ben Connolly (Dublin).