It was Power's sixth successive triumph over Nicol and moved him above Pakistani's Jansher Khan to second in the rankings.
Power, whose disguise and deception consistently wrong-footed Nicol, gambled successfully on his third match point after the Scotsman had pulled back to 14-14 from 14-12 down. As he had in the first game, Power opted to go for the single point to seal his victory rather than the safer route of setting to three points.
Nicol, whose cool efficiency breaks down when he plays Power, said he would have to be more aggressive the next time they played. "He seems to win the crucial points against me - it is very important that the next time I play him that I take those points," he said.