Brendan Honohan's try proved crucial as CBC Cork were deemed winners against Castletroy College at Woodleigh Park.
Honohan's try, which came in the third minute of injury-time, and subsequent conversion by David O'Riordan, meant that the home side could afford to concede a converted try from the Limerick school in further added-time, safe in the knowledge that they could not lose as they scored the first try.
This was a battle of attrition, with a low-scoring first half yielding just a penalty each.
Eventually, after No 8 Sean Glynn had done well, Christians forced an opening, Honohan touching down after Cian O'Halloran and Conor Barry had provided width, and replacement O'Riordan put seven between the teams.
Castletroy centre William Shanahan did go over after that, and Neville converted a difficult kick, but it was all in vain.
CHRISTIAN BROTHERS COLLEGE, CORK -- D McNamara; J McCarthy, K Slater, C Barry, C O'Halloran (S Keohane 70); B Honohan (T Moorhead 70), C O'Regan (D O'Riordan 60); P McCabe, C Scannell, J Burke; I Whelan, K Frost (C Keogh 46); Y Browne, D Nolan, S Glynn.
CASTLETROY COLLEGE -- B Neville; J MacDonnell, W Shanahan, E Clancy, A Fullen; S Morgan, N Cronin; K Kennedy, D O'Brien, B Foley-Friel (S Shinners 70); K Reale, D O'Brien; M Dooley, C Bonfil, E Carroll.
Ref -- E Hogan-O'Connell (MAR).