 Complete the following phrase:  The 2019 NHL Winter Classic officially the 2019 Bridgestone NHL Winter Classic was an outdoor regular season National Hockey League NHL game, part of the Winter Classic series, that was played on January 1, 2019. The game featured the Chicago Blackhawks taking on the Boston Bruins at Notre Dame Stadium in Notre Dame, Indiana, home of the University of Notre Dames Fighting Irish football team. This was the fourth Winter Classic for the Blackhawks 2009, 2015, 2017, sixth outdoor appearance overall and fifth in six years and the third for the Bruins 