Very very lucky because they scored the winning goal during the second half and I was even surprised for Manchester united to have won because from all there previous play they look very unstable for some period of time now.
I also think that this time, Man United is really lucky, the goddess Fortune is on their side. How could it not be, when they thought it was the end of time, and it seemed like there was no hope, they were finally able to score goals at the last moment. Even though during the match, Man United had quite a lot of chances, but many of them were in vain. On the other hand, Brentford have actually tried their best, they were quite attacking even though they only had a few opportunities for ball possession.
In the end, Chelsea was able to get a pretty good win with a score of 1 - 4 against Burnley. Although in reality, two of them were the fault of the Burnley players themselves. but at least, Chelsea got the full 3 valuable points.