Well said, both teams actually needed the win to further cement a place in their respective positions. Chelsea would have gone 4 points ahead of Manchester for the top 4 finish if they had won and Arsenal would would have being only 1 point ahead of 3rd placed Nottingham Forest if they had lost. So my take is, Arsenal needed the win more than the Blues that's why they played better and out of all the chances they created only one was found at the back of the net and sealed the win for them. Chelsea in that game really didn't play well for me in the first half and that was when I left the game to do other things because the game was already boring to me.
If I look at the hunt for the top 4 places this season, of course some teams still have a chance to achieve it because the points difference is so close to each other. Both chelsea, Manchester city, Newcastle united and brighton still have the same chance to achieve it so there will be fierce competition that we will witness every week.
In today match, Chelsea suffered a defeat when facing Arsenal. Arsenal managed to secure 3 points at home which made them end their bad streak in their last 3 matches. However, this victory was still not enough to make Arsenal stick closely to Liverpool because they are still 12 points behind Liverpool who are leading the standings.