Mikel Merino's equaliser helped Arsenal take a point from their Premier League meeting with Chelsea yesterday.
It finished 1-all at Stamford Bridge, where the hosts saw Moises Caicedo dismissed in the 38th minute for a dangerous challenge on Merino.
The result leaves the Gunners five points clear at the summit, with Chelsea in third.
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Elsewhere, Liverpool returned to winning ways with a 2-nil victory over West Ham.
Brighton beat Nottingham Forest by two goals to nil, Aston Villa were 1-nil winners over Wolves and Manchester United came from behind to win 2-1 at Crystal Palace.
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