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Dartford remain in the Vanarama Conference relegation zone after losing 3-0 at Grimsby.
Play-off chasing Grimsby opened the scoring after 13 minutes through Carl Magnay and doubled their lead seven minutes before half-time thanks to Nathan Arnold.
Darts failed to find a way back into the game after the break and their hosts added a third through a late Lenell John-Lewis penalty, leaving them two points from safety behind Altrincham and local rivals Dover.