Nicklas Bendtner scored his first Arsenal goal since March 2011 as the Gunners stayed in control at the top of the Barclays Premier League with a 2-0 win over Hull.
The Denmark striker was recalled to the starting XI to give leading forward Olivier Giroud a rest, and headed the hosts in front inside two minutes.
Mesut Ozil extended Arsenal's lead at the start of the second half, finishing off a fine passing exchange with Aaron Ramsey.
Bendtner - who last started a league game for Arsenal three seasons ago and almost left the club in the summer - took just 90 seconds to get on the scoresheet for the first time since an FA Cup tie against Leyton Orient in March 2011.
The Gunners' victory saw them maintain a four-point lead over second-placed Chelsea, who won 4-3 at relegation battlers Sunderland.
Aaron Ramsey sent full-back Carl Jenkinson - in the side for the injured Bacary Sagna - away down the right.
The England Under-21 international whipped over a perfect cross through the six-yard box, which Bendtner dispatched past Allan McGregor with a bullet header.
Arsenal - looking to keep ahead of their title rivals - had chances to extend the lead before half-time with a low, 20-yard shot from Ramsey tipped away by the Hull keeper.
The Gunners eventually doubled their lead at the start of the second half, when Ozil converted from close range after lovely interchange of passes with Ramsey at the edge of the penalty area.
Hull - who had beaten Liverpool at home on Sunday - never looked like mounting a fightback as Arsene Wenger's men continued to lay down a marker for a long overdue sustained assault on the Premier League crown.