A rampant Arsenal recorded an outstanding victory over listless Chelsea to end their seven-game run without a win in the top flight and ease the pressure on beleagured boss Mikel Arteta.
Two first-half goals set the Gunners on their way to their first top-flight win since November 1.
Alexandre Lacazette sent goalkeeper Edouard Mendy the wrong way from the spot and Granit Xhaka struck an excellent free-kick 10 minutes later to put Arteta's side in control.
Bukayo Saka's cross then dropped into the top corner early in the second half to put the game beyond the Blues.
Tammy Abraham notched from close range to make it a nervy final five minutes for the hosts before Jorginho saw his weak penalty saved by Bernd Leno.
Read on for the Gooner Fanzine PLAYER RATINGS:
Smith Rowe: 7
Willock: 6.5 - on for ESR on 65 minutes
Pepe: 6.5 - replaced Martinelli on 71 minutes
Mustafi: n/a on for Laca late on