Arsenal lit a fire to what looked like fading hopes of winning the Premier League title after crushing Chelsea in a London derby.
In what looked like a tricky game on paper, the Gunners never gave their rivals a chance following a dominant display that saw them power to a 3-1 victory and go two points clear of Manchester City at the summit - albeit having played two games extra.
Martin Odegaard opened the scoring early on before adding another on the half-hour mark.
The skipper's second goal was followed three minutes later by a Gabriel Jesus effort to make it 3-0 and job done for the north London side before Noni Madueke struck a consolation goal in the second half.