Chelsea should try and score early in the first half of this game if they hope to get a point from this game from what am seeing, because Brentford is ready to defend till the end of the game from what I can see Chelsea deserves a point from this game.
Brentford actually played a defensive game in the second half, just like you said. Chelsea did exactly what you said in the second half. Chelsea scored twice in the second half to take the lead against Brentford, but Brentford levelled up against Chelsea in additional time to deny Chelsea all three points. Well before Brentford vs Chelsea started, I already made it clear in this thread that Chelsea wouldn't defeat Brentford, and the game played as I expected.