CALGARY, Alberta — Brad Marchand scored his 22nd goal 3:36 into overtime to give the Boston Bruins a 2-1 victory over the Calgary Flames on Monday. After a turnover deep in the Flames end, Riley Nash sprung the Bruins’ leading scorer on a breakaway and Marchand made no mistake, slipping the puck through the pads of David Rittich. David Pastrnak also scored for Boston (36-13-8), which moved within one point of Tampa Bay for first place in the Atlantic Division and Eastern Conference.