On the last night of summer at Coors Field, with a lively crowd split evenly between purple and blue, the Rockies went ahead by two runs over the NL West-contending Dodgers. But Los Angeles emerged with a 5-4 victory in 10 innings. Colorado was unable to produce clutch hits — 4-of-20 with runners in scoring position — while closer Jhoulys Chacin gave up L.A.’s game-winning run on an Albert Pujols RBI single.