DOLPHIN 16 CLONTARF 10, Musgrave Park
Scorers: Dolphin: Try: Barry O'Mahony; Con: Barry Keeshan; Pens: Barry Keeshan 2; Drop: Barry Keeshan
Clontarf: Try: Phil Howard; Con: Daragh O'Shea; Pen: Daragh O'Shea
Clontarf remain top of the Division One table but their lead has been cut to just two points ahead of the Christmas break.
Dolphin, who are now right in the play-off hunt in fourth position, fielded an enviable back row unit of Munster duo Justin Melck and James Coughlan and young openside Barry O'Mahony.
South African Melck was making his debut for the club at number 6, while Coughlan slotted in once again at number 8 after a late cameo against Clermont Auvergne on Saturday afternoon.
A first-minute indiscretion allowed out-half Barry Keeshan slot a penalty and nudge wind-backed Dolphin ahead.
The Cork men led 9-3 at half-time, with Keeshan adding another penalty and a drop goal to his side's tally, although he did miss two other penalty attempts and on the balance of play, the hosts should really have been further ahead.
They made heavy weather of things and a number of knock-ons spoilt attacking moves when the 'Tarf defence looked stretched.