Answered April 28th, 2019

Al Horford is the first Celtics player with at least 20p/10r/3b in a road playoff game since Paul Pierce in 2002.

Who was the last Celtics player with 20 points, 10 rebounds and 3 blocks in a road playoff game?
Interpreted as:
Who was the last Celtics player with 20 or more points, 10 or more rebounds and 3 or more blocks in a road playoff game?