Answered February 23rd, 2020

The Washington Capitals put up 6 goals against the Penguins in Game 5 of the 2018 Eastern Conference Second Round on May 5, 2018.

which team was the last to score 5 goals in a playoff game against the penguins
Interpreted as:
Which team was the last to score 5 or more goals in a playoff game against the penguins?

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