That's when they have met in the Stanley Cup Playoffs each of the past three seasons, and maybe they'll see each other there again next spring. For now, they'll part until their final meeting of the regular season at Pittsburgh on March 12.
They'll have a lot chew on from this one, which the Penguins held on to win 2-1 at Capital One Arena.
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It wasn't the prettiest game, but the Penguins needed this kind of hard-fought win. The Capitals (20-10-3), the reigning Stanley Cup champions, are in first place by four points in the Metropolitan Division after winning their previous five and 12 of 14.
The Penguins (16-12-6) have 38 points to tie them with the New York Islanders, who have played one fewer game, for third place in the division.
"We've got to build on it," said captain Sidney Crosby, who scored the Penguins first goal and assisted on Bryan Rust's winner with 1:02 left in the second period. "It's a divisional game, a rivalry, and a team we've seen a lot. I think these games, these kind of intense, emotional games, bring out the best in us."