Kyle Lafferty scored both goals as Northern Ireland beat Finland to boost their chances of a first major finals appearance since the 1986 World Cup.
With four wins from five games, they trail Romania by a point at the top of Euro 2016 Qualifying Group F.
Lafferty scored with a right-foot volley and then made it five goals from five qualifiers with a guided header.
Berat Sadik grabbed a late consolation for the Finns after Roy Carroll spilled Roman Eremonko’s initial drive.
Michael O’Neill’s side are four points clear in the second automatic qualification place after Hungary were held to a 0-0 draw at home by Greece.
Group leaders Romania, Northern Ireland’s only conquerors to date, visit Belfast on 13 June.
Lafferty’s two goals have taken his total in qualifying to five – joint-second with Germany’s Thomas Muller and Israel’s Omar Damari, and one behind Danny Welbeck of England.
The striker’s form for his country contrasts with a tough season at club level, having been sent out on loan to Turkish side Caykur Rizespor in February after struggling at Championship side Norwich City.
Northern Ireland boss O’Neill made a major selection call by leaving out Brighton defender Aaron Hughes, with the 35-year-old primed to overtake David Healy as his country’s most capped outfield player.
The match pitted the Northern Ireland boss against a familiar figure as his Finnish counterpart, Mixu Paatelainen, was the man who gave him his coaching break as his number two at Scottish club Cowdenbeath.