Leinster Lightning defeated the North West Warriors by an innings and 67 runs after the home side collapsed to 212 all-out on the final day at Bready.
Half centuries from David Rankin and Rosheen Silva had given the Warriors hope of salvaging a draw but they lost their final seven wickets for 48 runs.
Tyrone Kane dismissed both Rankin and Silva to start the collapse.
Peter Chase grabbed four wickets to complete a seven-wicket haul while keeper Lorcan Tucker took five catches.
Ricky-Lee Dougherty (29 no) and Jared Barnes (14) struck some lusty blows in a last-wicket stand of 42, but it was merely damage limitation by that stage.
The margin of defeat will certainly give the Warriors coaching staff much food for thought before their next match against the same opponents - a 50 over contest at The Hills on 12 June.
Hanley Energy Inter-Provincial Championship
Leinster Lighting 414 (118.2 overs) J Anderson 87, T Kane 67, M Sorensen 56, A McBrine 3-74, S Thompson 3-84, A Gillespie 2-75)
North West Warriors 128 (D Hyatt 37, R Allen 31, T Kane 3-23, P Chase 3-33, G Dockrell 2-10) and 219 (78.3 overs, D Rankin 58, R Silva 50, P Chase 4-22, S Singh 2-21, T Kane 2-25)
Leinster Lightning (24 pts) beat NW Warriors (three points) by an innings and 67 runs