Throughout the season former player Clive Walker provides radio and TV commentary on Chelsea's games. Here he selects five aspects from the derby delight in north London that caught his eye…

It was a positive start to the game by Chelsea because if you allow Arsenal to gain the advantage they can be a force. It was important Ramires and John Mikel Obi started well as the deeper midfielders and they did so. A lot of Arsenal's play over the years under Arsene Wenger has come straight through the middle and the fact Theo Walcott wasn't in the starting line-up increased the likelihood that would be the case. Wenger maybe thought we would sit back and try to control the game from the back but we didn't do that. Gervinho admittedly scored but his selection probably played in to Chelsea hands as well.

Inevitably everyone watched the performance of John Terry closely. He wasn't playing up against a player like Emmanuel Adebayor so I expected him to win most challenges in the air, Olivier Giroud may have given him more of a problem than Gervinho in that regard. You know Terry will give you at least a seven out of ten performance every game, often an eight or a nine but just as important is the organising which you miss when he is not there. I thought it was a sterling performance in the circumstances he was under.

Losing Abou Diaby to injury early on was a blow to Arsenal, as can be seen from the way the marking went for Fernando Torres's goal. It was a superb ball in by Juan Mata but David Luiz was in acres of space, and the substitute Oxlade-Chamberlain had been marking him. The tall Diaby might have cleared the ball. As an attacking force, Oxlade-Chamberlain did cause us problems and set up the equalising goal. It was great to see Torres score against Arsenal when it was always Didier Drogba who caused them a lot of problems previously. That will do him a world of good.

I've highlighted before that Ramires playing in a deeper role has looked good. There was one moment in Saturday's game when the play was broken up on the edge of our box and he went off like a train. That is what you can get from him in that role and that is when he is at his best.

Every time you play one of the top teams you expect your goalkeeper to have to make one or two top saves. Cech did that in the second half, as he does time and time again without being flamboyant. We have got used to him being there but his performances and decision making have got better with age. It is always an absolute pleasure to beat Arsenal who had really got themselves going which meant it was our biggest test. We came through it and playing against a side in good form and scoring goals means it was an even more enjoyable result.

Clive Walker is part of the commentary team for games on this season. Go to our Matchday Live section or hear it via our Mobile App.