Les Blackhawks pourront-ils etre competitifs malgre les departs de plusieurs defenseurs? NHL https://www.nhl.com/video/31-in-31-chicago-blackhawks/t-277350912/c-52452103?tag=program&tagValue=31%20in%2031 Preview https://www.nhl.com/news/2017-18-colorado-avalanche-season-preview/c-290524970?tid=290471364 Key statistics https://www.nhl.com/news/2017-18-blackhawks-numbers-stats-analysis/c-290601190?tid=290471364