Arsenal re-established themselves as serious contenders for their first Premier League title since 2004 with a comfortable victory at lowly Bournemouth.
A first win in four games took them level on points with second-placed Tottenham Hotspur, their bitter local rivals who have a superior goal difference.
After more than five hours without a league goal, Arsenal scored two in little more than a minute midway through the first half by Mesut Ozil and Alex Oxlade-Chamberlain.
Arsene Wenger's team are still five points behind leaders Leicester City but play at home to them next Sunday.