The Yankton boys shot just 25 percent from the floor in the first three quarters last night at the Pentagon, and Harrisburg held off a furious charge by the Bucks to post a 50-47 victory. Rugby Ryken led Yankton with 19 points, all in the fourth period, while Matthew Mors chipped in 14 points. Yankton is now 12-3 overall and the Tigers are 11-2 and moved past the Bucks into second place in the Class AA point standings.