Rangers B team beat their Celtic counterparts in a tense Old Firm clash in the Lowland League on Tuesday night.
Cole McKinnon's headed goal separated the sides at the end of a tight game at Parkhead stadium.
The underage clash served as an appetiser for this weekend's massive Scottish Cup semi-final between the senior sides.
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Celtic boss Ange Postecoglou was an interested spectator at Tuesday's B-game, the Hoops boss keeping a watchful eye on his club's young side which featured Ballymena teenager Ben Wylie.
Wylie - who last year signed a new deal with Celtic which commits him to the club until 2024 - is highly rated at Parkhead.
The 19-year-old is a Northern Ireland Under 21 international who spent part of last season on-loan with Ballymena United.
The Rangers B team featured a number of other young Northern Ireland stars.
Charlie McCann (19), Kyle McClelland (19) and Ross McCausland (18) all started Tuesday's derby game, while former Glentoran youngster Charlie Lindsay (17) came off the bench as a late substitute.
The winning goal came in the 66th minute, McKinnon heading home from a corner to settle a scrappy game in Glasgow.
The result edges Rangers to within three points of Celtic with a game in hand.
Teams
CELTIC : Oluwayemi, Corr, Anderson, O'too, Lawal, Carse, Karamoko, Moffat, Kenny, Wylie, Vata.
SUBS : Mackenzie, Mullen, Letsosa, Brooks, Dawson, Dede, Summers
RANGERS : Budinauckas, Devine, Fraser, Allen, McClelland, Miller, Ritchie-Hosler, Mckinnon, Weston, McCann, McCausland.
SUBS : Hogarth, Harkness, Lindsay, Strachan, McInally, Lyall, Ure.
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