BOSTON — Here are five reasons the Warriors lost 92-88 to the Celtics at TD Garden in Boston on Thursday night.



1. Fouling



The Warriors won the first quarter by 10 points because they defended with energy and focus but also a level of cautiousness, only committing one foul in 12 minutes and holding the Celtics to 18 points and zero free-throw attempts.



But over the next three quarters, that energy transferred into some overaggressiveness. The Warriors fouled the Celtics 23 times in the final 36 minutes, putting them on the line for 38 free throws, 19 more than they took, a massive discrepancy in a four-point loss.



“24 to 15 (in fouls),” Steve Kerr said. “We committed nine more fouls. It was actually 23. The last one wasn’t a foul.”



Kerr then laughed.



“No, that’s petty on my part,” he said.



Kerr’s quip was the closest the Warriors came to directly criticizing the...