Chelsea boss Mauricio Pochettino was left frustrated after their 2-2 draw with Arsenal.
The Blues were 2-0 ahead via a Cole Palmer penalty and a Mykhaylo Mudryk freak goal before Arsenal's fight back.
Pochettino said, "I feel until 77 minutes when we conceded the first goal, I think we were in control and didn't concede many chances. I think Arsenal are an amazing team, they were fighting last season for the trophy and I think this season improved with some players also. Yes, disappointed because we dropped two points.
"I think it can happen, this type of situation and you have to accept it. Today, we are in an era of football that the way we want to play from the back and now we cannot say he was, oh, we can be tough. But that is football, this is the situation. Of course, mistakes can happen in football. We make mistakes, a lot of mistakes and when the players are on the pitch they are allowed to. I think we give the possibility to make a mistake of course.
"Unlucky, because I think it was 77 minutes, 2-0, and this goal gave the belief to Arsenal, and 2-1 with 10 minutes to play, 13 minutes to play when you can concede and take risks like they were taking. In the end disappointed.
"At the same time, I am so happy because we were very competitive, with all the circumstances we need to feel about the performance and how we played."