The first half just ended and the both teams played very well, Brentford played a very defensive game against Chelsea which I think Brentford was tough in the first half which might not be easy for Chelsea to have advantage against Chelsea. The both teams have chances of scoring goals in this match which can end up with a draw score. Chelsea's performance have really changed, I can see good improvements from their performance unlike past games in the beginning of the season.
At the end of the match, Brentford's defensive strategies against Chelsea proved effective for them to win Chelsea by 2 goals. The way the game went to Brentford's advantage is not surprising to me. Before the game ever started, Brentford had everything planned out. They are aware that they will lose if they come out to challenge Chelsea on the field of play. For them to win Chelsea at home they should develop a strategy, which is a defensive game. Playing a defensive game should be the best and only method to defeat Chelsea at their best form.