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Martyn Beaumont scored a late try to give Dover a battling 20-13 win at Thanet Wanderers in London 2 South on Saturday.
Thanet opened the scoring from a penalty but Dover responded through Jon Foster's try, converted by Beaumont.
The visitors moved further ahead through a Beaumont penalty but when Ricky Stanley was sin binned in the final few minutes of the half Thanet kicked the penalty to reduce the deficit.
The hosts moved with a converted try but Dover refused to give up and Beaumont's 77th- minute touchdown was followed by a conversion and penalty to seal the points.
Deal & Betteshanger, meanwhile, cemented their place in mid-table after a 31-15 win at London 3 South East strugglers Lordswood.
Anthony Hart, John De-Roebeck and Martin Robinson were the try scorers.