The Boston Celtics and New York Knicks are set to meet in the Eastern Conference semifinals, marking their first playoff series since 2013 and the 16th overall in their storied rivalry. Historically, the Celtics have won eight of the 15 series, with notable successes in the 1960s and ’80s, including a sweep in 2011, while they lost in six games in 2013. This year’s series begins on Monday at TD Garden, prompting a retrospective on their previous encounters, which showcase significant performances from legends like Bob Cousy, Bill Russell, and Walt Frazier.