Michael Frolik and Marcus Kruger have been a big part of Chicago's penalty-killing success this year. Chicago has not surrendered a power-play goal in the playoffs. "They've been real solid all year," Blackhawks coach Joel Quenneville said. "When they started at the beginning of the year it was a work in progress, and they've progressed in a real nice way. They're first and third on each kill, they're blocking shots, they're getting in lanes and play at a good pace. It's gotten them more of a role, more ice time. And that line played well all year, so a real nice fit for us." They've been something of an unlikely duo, especially seeing as Frolik wasn't known for killing penalties before coming to Chicago. All the same, they've become valuable pieces of the Blackhawks' squad.