Mikko Rantanen will take credit for the overtime game winner on Wednesday night. But the result was simple math. More shots on goal equal more opportunity to score, and against Calgary in the Stanley Cup Playoffs, the Avalanche can’t get enough. “We were humming,” Rantanen said. “We had a lot of good chances even before my goal.” Colorado can close out the Flames series Friday in Game 5 thanks to its relentless attack.