But the Celtics might’ve finally reached a saturation point as they missed a record 45 of them Monday night as the Knicks took advantage in a 108-105 Game 1 overtime victory. At one point in the second half, after the Celtics built a 20-point lead and looking to be on their way to a 10th win in their last 11 meetings with the Knicks, Boston missed its next 10 shots and all were 3-pointers. In all, the Celtics went 15-of-60 on 3-pointers, the most ever taken in a playoff game. “Some of ’em felt good, some of ’em felt like we maybe forced the issue,” said Celtics star Jaylen Brown, who was 1-of-10 on 3s in the game. “Definitely our rhythm and our timing was a little bit off. We got a lot of great looks, but it may be some truth (to shooting too many) today.”