BANGOR — Houlton High School senior guard Kolleen Bouchard spent time last summer working on a step-back move with her older brother Kyle, who plays at Bentley University in Massachusetts, where she will join him this fall. It came in handy on Saturday night. The Miss Maine Basketball semifinalist used the move to nail a game-tying 3-pointer from the left side with 24.1 seconds remaining in regulation and her free throw with 2:18 left in overtime broke a 30-30 tie and enabled the top-seeded Shires to survive a stiff test from the youthful Dexter Tigers 33-30 in their Class C North championship game Saturday night at the Cross Insurance Center. The 21-0 Shires, the Class B North champ a year ago, play defending Class C state champ Monmouth Academy (20-1) in Saturday’s 7:05 p.m.