It was an impressive response, the home side scoring points each time they entered the Force's territory. But they couldn't go on with it; replacement halfback Alby Mathewson helping spark a comeback from the visitors.
With first-five Gareth Anscombe turning up to Pukekohe's EcoLight Stadium on crutches due to a broken foot bone, Aaron Cruden started once again.
The All Blacks playmaker began well - he kicked six from six in the first extended test of his troublesome groin and quadriceps injuries, but he looks like a man who could do with a rest. Anscombe is expected to be out until after the June tests.
Second-five Bundee Aki and fullback Robbie Robinson began well but faded in the face of a resurgent Force. Lock Brodie Retallick was his brutish best in close quarters and flanker Sam Cane looked athletic and supremely motivated. Their contributions were highly important in the finish.
After Dellit went over in the corner, the Chiefs' forwards led the way in front of a crowd of about 6000. The acid will have gone on them recently, and the tactics were perfect in the wet conditions.
Retallick's nice touch wide on the right allowed wing Lelia Masaga to go over in the corner - although lock Toby Lynn should have made the tackle - and the Chiefs regained a lead they would not relinquish.
It was another impressive performance from the Force, who have beaten the Crusaders at home, and, remarkably, the Reds in Brisbane. they also held Ewen McKenzie's men to a draw at Nib Stadium last weekend.
With wing Nick Cummins a constant danger and their forwards increasingly good as the match wore on, they were unlucky not to get more out of it. They were also heavily penalised by referee Mike Fraser.
There was an element of frustration in the Force's play in the second half as they struggled to understand Fraser's rulings, and, with Mathewson lifting the tempo, Dellit scored his second wide on the left after a good burst by fellow wing Cummins.
Close but not close enough for the Force.
Chiefs 22 (Lelia Masaga try; Aaron Cruden con, 5 pensForce 21 (Pat Dellit 2 tries; Jayden Hayward con, 3 pens HT: 19-11