It was the Ross Adair show once again as the CIYMS opener made his second century of the week, hitting 13 sixes and 11 fours in a brilliant 134 from only 53 balls as the Belmont side piled on the agony at Cregagh.
Adair shared an opening stand of 175 in 12 overs with Chris Dougherty, who was no slouch either as he hit 5 sixes and 2 fours in 53 from 27 balls.
There was no respite for the home side as Keith Dudgeon continued the barrage, hitting 6 sixes and 2 fours in an unbeaten 52.
In total CIYMS hit 24 sixes and 16 fours in their huge score of 261 for 2.
Not surprisingly, Cregagh never got close, 125 all out, with teenagers Adam Kennedy (3/20) and Carson McCullough (2/22) doing the bulk of the damage.
The huge win and the boost to the NRR means they are almost certain to join Carrickfergus in the semi-finals.
North Down still have a mathematical chance, albeit a slim one after they and Woodvale tied in a DLS affected match.
Ani Chore’s unbeaten 68 helped the Comber side to 148 for 7 – three wickets for left-armer Stephen Bunting (3/15).
The top three Woodvale batters all got runs with James Hall top-scoring with 35, while Harry Warke (29) and Ruhan Pretorius (28) all chipped in. Neil Brand’s 2 for 7 ensured parity as Woodvale ended on 130 for 6 in 18 overs – the par score.