St Patrick's Athletic gave their prospects of qualifying for the UEFA Cup a big boost with this eircom League of Ireland Premier Division win at Cork City.
Pat's consolidated second place in the table, while Cork drop to fourth position following this home defeat at Turner's Cross.
The only goal of a lively game came after 20 minutes when Mark Quigley crossed from the right wing for Gary O'Neill to chest the ball home at the far post.
Cork pressed for an equaliser but the visiting defence and goalkeeper Brendan Clarke stood firm.
St Patrick's, who had hammered Shamrock Rovers 5-0 at Inchicore on Friday night, continued with Clarke in goal for the injured Barry Ryan.
Cork, who relinquished their 12-match unbeaten run at champions Drogheda United at the weekend made one change, with John O'Flynn starting in attack in place of Leon McSweeney who moved to the substitutes' bench.
John McDonnell's side took the lead when a left-wing cross
from Mark Quigley found Gary O'Neill who chested the ball to the net from six yards out past the diving Michael Devine.
The home side, as expected, pushed on for an equaliser. Colin Healy was denied a goal by Clarke who bravely dived at the former Sunderland player's feet after 23 minutes.
Clarke was again called into action just after the break when he saved a long-range effort from Denis Behan, but O'Neill could have scored his and St Pat's second goal when through against Devine he weakly shot against the goalkeeper.
But it was Cork who created a host of chances - the best when Billy Woods set up John O'Flynn whose header was just off target after 75 minutes.
Cork might now have to rely on the FAI Cup for European football next season and they meet Bohemians in the semi-final next Friday night.