Question: 1931–32 Boston Bruins season, in the course of playing a 0–0 tie against the New York Americans on 3 January 1932, the Bruins shot the puck the length of the ice 87 times to relieve pressure on their goal, to stop this becoming a regular tactic, which rule, an infraction in the sport of ice hockey, was introduced into the NHL later in the decade? 
Context: Harold "Pee-Wee" Oliver (October 26, 1898 – June 16, 1985) was a Canadian ice hockey forward who played for the Calgary Tigers of the Western Canada Hockey League (WCHL) and the Boston Bruins and New York Americans of the National Hockey League (NHL).  He was a member of the Tigers' 1924 WCHL championship and won the Stanley Cup with the Bruins in 1929.  Oliver played nearly 600 games in a professional career that spanned 16 seasons and scored 217 goals.  He was inducted into the Hockey Hall of Fame in 1967. Ralph Harvey "Busher" Jackson (January 17, 1911June 25, 1966) was a Canadian professional ice hockey player.  Jackson played 15 National Hockey League (NHL) seasons between 1929 and 1944 for the Toronto Maple Leafs, New York Americans and Boston Bruins.  He was a member of the famed Kid Line with Joe Primeau and Charlie Conacher, one of the early NHL's dominant scoring trios.  Jackson led the league in scoring in 1931–32 and was member of Toronto's 1932 Stanley Cup championship team.  He was named to five NHL All-Star Teams and played in three benefit all-star games, including the Ace Bailey Benefit Game, the first all-star game in NHL history. The 2008–09 Boston Bruins season is the Bruins' 85th season in the National Hockey League (NHL).  Their regular season began on the road on October 9, 2008, in Denver versus the Colorado Avalanche and concluded on April 12, 2009, against the New York Islanders.  The Bruins looked to improve upon the accomplishments of the 2007–08 season, which included Boston's return to the NHL playoffs for the first time since the 2003–04 season. Cecil Ralph "Tiny" Thompson (May 31, 1903 – February 9, 1981) was a Canadian professional ice hockey goaltender.  He played 12 seasons in the National Hockey League (NHL), first for the Boston Bruins, and later for the Detroit Red Wings.  A four-time Vezina Trophy winner, Thompson was inducted into the Hockey Hall of Fame in 1959.  He was a member of one Stanley Cup-winning team, as a rookie in the 1928–29 season with the Boston Bruins.  At the start of the 1938–39 season, after ten full seasons with Boston, he was traded to the Detroit Red Wings, where he completed the season, and played another full one before retiring.  During his NHL career, he recorded 81 shutouts, the sixth highest of any goaltender.  After retiring from playing, he coached lower-league teams before becoming a noted professional scout.  Thompson helped popularize the technique of the "glove save" which was catching the puck with his hands as a method of making a save.  A competent puckhandler, he was the first goaltender in the NHL to record an assist by passing the puck with his stick to a fellow player. The Boston Bruins Ice Girls, or simply Bruins Ice Girls, are a professional cheerleading team (specifically, an NHL Ice Dancer team) supporting the Boston Bruins of the National Hockey League.  The 2011–2012 Bruins Ice Girls team consists of 17 members including their captain, 'Holly.'  During Bruins home games the Bruins Ice Girls host different contests and events, many of which involve the fans.  Outside of Bruins games the Bruins Ice Girls are also very active in the community, and are involved in charity events, fundraisers, and viewing parties. The 1924–25 Boston Bruins season was the team's first in the NHL.  Along with the Montreal Maroons, the Bruins were the first expansion franchise in the NHL and the league’s first American-based club.  The Bruins finished sixth and last in the league standings.  The Bruins' debut season home games were played in the only "debut" rink of any of the Original Six NHL teams that has survived into the 21st century — Boston Arena, the world's oldest indoor multi-sports facility, that is still used for ice hockey at any level of competition. In the course of playing a 0–0 tie against the New York Americans on 3 January 1932, the Bruins shot the puck the length of the ice 87 times to relieve pressure on their goal.  To stop this becoming a regular tactic, the icing rule was introduced into the NHL later in the decade. Icing is an infraction in the sport of ice hockey.  It occurs when a player shoots the puck across both the centre red line and the opposing team's goal line, and the puck remains untouched.  However, it is "not" icing if the puck is shot from behind the halfway line "into the goal"; if the puck crosses the goal line completely, the goal is counted. Christopher Redvers Green (December 12, 1899 – July 25, 1966) was a Canadian professional ice hockey left winger who played six seasons in the National Hockey League for the Hamilton Tigers, New York Americans and Boston Bruins.  He won the Stanley Cup in 1929 with the Boston Bruins.  Green was born in Sudbury, Ontario. Martin James "Goal-a-Game" Barry (December 8, 1905 – August 20, 1969) was a Canadian professional ice hockey forward who played for the New York Americans, Boston Bruins, Detroit Red Wings and Montreal Canadiens in the National Hockey League (NHL) between 1927 and 1940.  Barry was frequently among the league's leading scorers and after winning his first Stanley Cup with the Red Wings in 1936, he scored the championship winning goal in 1937.  Barry won the Lady Byng Trophy in 1936–37 as the NHL's most gentlemanly player and was named to the First All-Star Team.  Following his playing career, Barry coached junior and senior teams in Halifax, Nova Scotia for many years.  He was inducted into the Hockey Hall of Fame in 1965.
Answer: Icing