"Most of it is mental discipline," Armstrong said, explaining the secret to Harvard's penalty killing success. "You have to stay where you should be and keep a tight box. When you deviate from that system, that's when you're going to get stung."

"We've been sticking to the system pretty well," Armstrong added. "We've always had pretty good killers."

Penalty killer. Qu'est-ce-que ce'est?

Perhaps no one appreciates the extra-man art more than a goalie. By mathematical design, the better the team's penalty-killing percentage, the better the netminder's goals-against average.

"I hope we keep it going," Harvard goalie John Devin said Saturday. "We're over 90 percent now. Teams don't usually get that many goals against us, and when they score them, they score on the power play."

Saturday, the Crimson took the charge out of Princeton's power play Right, professor Cleary?

Quoth the hockey scholar: "You don't have to be Einstein to figure out penalty killing was the key to the game."