have you ever tracked your M-F Wins/Losses vs Sat-Sun? I rarely play NHL but I would imagine it mirrors NBA and MLB in that the pro's bet the M-F and those are weaker lines and then Sat-Sun are the recreational guys who are off on wknds and gamble these sports and get set-up by the books on what looks too good to be true? It's played out that way in NBA and MLB in my years of experience. Others here on Rx can back that up....win M-F and then give it back on bogus fishy lines on the wknd.