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Bruins vs. Blues: Why ‘zig-zag theory’ may not pay off for Boston backers

Will the Zamboni zig-zag through the 2019 Stanley Cup Finals? Old-school sharps wouldn’t be shocked. A dramatic Game 2 bounce-back from the Blues showed why so many bettors consider using the “zig-zag” theory in playoff betting. The pre-series underdog had been badly outclassed by the Bruins during Monday’s series opener. St. Louis was outshot 38-20, and lost the analytic stat “expected goals” by a wide 3.83 to 1.24 margin, according to hockey website Natural Stat Trick. Then, in Wednesday’s rematch: St. Louis virtually reversed shot count, winning the stat 37-23. Now, through two games, the Bruins hold just a slim 61-57 edge in shots despite being a medium favorite on home ice. St. Louis won “high-danger scoring chan ...