The New York Knicks must figure out how to finish off games. Just watch the Boston Celtics. The Celtics led for just 60 seconds in the second half until Ray Allen sank a go-ahead 3-pointer with 12 seconds left and beat the Knicks 87-85 in their playoff opener on Sunday night. "Down the stretch we found a way to win," Paul Pierce said, "and that was because of our experience." The Celtics won their NBA-high 17th championship in 2008 and lost in Game 7 of the finals last year to the Los Angeles Lakers. The Knicks, in the playoffs for the first time in seven seasons, last won a postseason game on Apr. 29, 2001. Read more: http://sports.espn.go.com/nba/recap?gameId=310417002