The NBA is not known for giving away opportunities. Yet that's what the Kings did Tuesday to help the Boston Celtics to a 95-92 victory. The victory didn't come without a fight, and the 14,439 fans felt the pain at Arco Arena. There have been games this season in which the Kings have missed free throws and sabotaged their efforts. However, never have they done so as blatantly as they did Tuesday night. Sacramento missed eight of 10 free throws during the fourth quarter. Six of those misses came during the final 1:32.  Kings coach Paul Westphal openly admitted his team lost the game by shooting so poorly at the free-throw line. "I don't know how to measure frustration," Westphal said