NEW YORK – The NHL Players Association intends to challenge a lockout before labor boards in Quebec and Alberta, a move that if successful could force the league to pay players on the Montreal Canadiens, Calgary Flames and Edmonton Oilers during a work stoppage. The sport's labor contract expires at the end of Saturday and a lockout appears to be certain, which would be the league's fourth work stoppage since 1992 and first since the 2004-05 season was wiped out. Labor law in Canada is provincial, not national. The NHLPA is not recognized as a certified union in Quebec. Meanwhile, The Boston Bruins have signed leading scorer Tyler Seguin to a six-year, $34.5 million extension, the National Hockey League (NHL) team said Tuesday. — AP