Chelsea is not winning against Arsenal. I am pretty confident about Arsenal winning this match. Chelsea has been able to win two matches in a row, but this is going to bring an end to their winning streak. Arsenal is definitely competing for the English Premier League title. And they are not going to let things go easily at all. I am pretty sure that they are going to win against Chelsea, the bigger question is about how many goals. I predict it is going to be something like 2–0 at least. I believe that is going to be the list goal difference between Chelsea and Arsenal and it is going to be in favour of Arsenal for sure.
I agree with you and actually Chelsea has always lost to Arsenal in several seasons. Even last season Arsenal managed to win 2 times in a row. So even this time I think Chelsea's hopes of winning are very, very slim. Opportunities are always there but they are opportunities that are barely even visible. But in this match Chelsea are the hosts so Chelsea should also be able to score 1 goal. My estimate is that the resulting score is 3-1 for Arsenal to win.
Chelsea have indeed been a little better in the last few matches. But fighting Arsenal is not easy. Experiencing a little improvement will not be enough to beat Arsenal. And currently Chelsea even has 7 players who are still injured. Pochettino still has to think hard about this. And if Chelsea realizes that their strength will not be enough to beat Arsenal then Chelsea will most likely try to get a draw. But after I think again, maybe they will still use an attacking strategy. Because Chelsea fans will definitely not be satisfied if they see Chelsea only focus on defending.