CIYMS IVs inflicted a first defeat of the season on Ballynahinch VIIs as they claimed a 37-22 win in Minor East 2.
Hinch had the stronger pack and they took the lead with a try from full-back James Gregg.
Michael McCombe then converted a try by Neil Spottiswood to give CI the advantage, but Hinch regained the lead when centre Stephen Seymour scored their second try.
CI took control after a break by full-back Johnny Cupitt allowed Spottiswood to go in for his second, which was also goaled, as was another try from Richard Maunder, which put them 21-10 ahead.
Hinch centre Clem Bassett set-up Seymour to cut the advantage, but CI had the better of the second period especially when their opponents had a player yellow carded.
Hinch's best was scored by former Irish Youth out-half Paul Koscielny for Ray McCavery to add the points.
CI out-half McCombe, who had a total of three penalties including a long effort from the 10 metre line, scored 17 points.