Yorkshire gained a measure of revenge for two one-day defeats at the hands of Derbyshire this season with an eight-wicket victory in the Friends Life t20.
Ben Sanderson took four for 21 in only his second game of the summer to restrict Derbyshire to 127 for seven, with Martin Guptill top scoring with 46 off 39 balls.
Derbyshire never looked like defending that total and Adam Lyth hit an unbeaten 41 off 32 balls to see Yorkshire home with two overs to spare.
Although both teams had failed to qualify for the quarter-finals, there was a crowd of around 2,000 to see whether Derbyshire could complete a hat-trick of wins over Yorkshire, but they were pegged back by tight seam bowling.
Guptill needed a runner towards the end of his innings and was one of four wickets that fell in eight balls as the Falcons tried in vain to break free.
Sanderson and Rich Pyrah did the damage and denied Derbyshire the acceleration they needed to set a challenging target after Guptill and Wayne Madsen had established a platform.
But after adding 58 in 10 overs, both fell to consecutive balls from Pyrah and then Sanderson also struck twice when he had Chesney Hughes caught behind and bowled Jon Clare first ball.
Sanderson bowled the big-hitting Ross Whiteley and although Alex Hughes marked his first-team debut by hitting him back over his head for four, the Falcons managed only 34 off the last five overs.
Yorkshire were clearly in no mood to hang about with Andrew Gayle taking 18 from a Mark Turner over and the visitors had passed 50 in the sixth over before Gayle was lbw to Whiteley for 30 off 22 balls. At least Derbyshire did not allow Yorkshire to romp away, but they needed to take wickets to put Carnegie under pressure and they did not break through again until it was too late.
Joe Sayers had scored 43 off 38 balls when he tried to work Chesney Hughes into the leg side and was lbw. And although Steffan Jones sowed a few seeds of doubt by conceding one run off the 16th over, Lyth made sure there were no slip-ups. He hit Jones for four boundaries in the 18th over to seal the victory.