Fly-half Rhys Priestland kicked Cardiff to a dramatic 19-18 United Rugby Championship victory at Dragons.
Will Reed missed a last-minute penalty from 45 metres and the Men of Gwent have now not beaten their fierce rivals since Boxing Day 2014 - a run of 14 matches.
The game was marred by two red cards in the first half, Joe Davies of Dragons and Cardiff’s Liam Belcher both for high challenges.
Priestland was Cardiff’s hero with four penalties and a conversion of a try from Lloyd Williams.
Jack Dixon and Olly Griffiths scored tries for Dragons, Sam Davies converted one with Reed adding two penalties.
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