The lads dominated the second half at Griffin Park but couldn't add to Andy Barcham's seventh minute opener, a lead cancelled out by Scott Sinclair after 16 minutes.
Goalkeeper Stuart Searle denied Simon Dawkins twice in the first half, produced the save of the night to keep out Tomas Pekhart's header just after the hour and then blocked a Barcham chance with his legs. When he was beaten, Kevin-Prince Boateng's header cannoned back off the crossbar.
At the other end, Chelsea also hit the woodwork in the first half but Ben Alwnick was only forced into one save of note in the second half.
"It was our best performance of the season so far against technically very good opposition and the way we pressed and regained possession meant we controlled the game," reflected Clive.
"We kept creating chances, Chelsea defended well and the keeper made a fantastic save from Tomas Pekhart's header.
"We limited their chances and the only disappointment was the goal we conceded, we switched off for a minute and got punished, but there were a lot of positives out there.
"You often look back at games and analyse what went wrong but we haven't done too much wrong in the way we played and passed the ball.
"I told the lads in the dressing room afterwards that they put in a very good performance without capitalising on the chances and being ruthless in terms of finishing the game off."
Clive Allen knows we came away from our reserve clash against Chelsea at Brentford with one thing missing - the win.