Gainsborough Maori travelled to local rivals Market Rasen and came home with a 29-15 win.
Rasen broke the deadlock with a well taken penalty but Gainsborough dominated the first half, Parkinson crossing the line.
Rasen took the lead with a converted try before newcomer Kieron Locking went over for his third try of the season, converted by Shaun Parker.
Parkinson kicked a penalty, and after the break Locking got his second try.
Rasen answered with a converted score, but Locking bagged his hat-trick, Parkinson converted and Gainsborough took the win.