Arsenal snatched a dramatic 2-1 victory over Burnley to keep their title hopes on track after the referee Jon Moss awarded penalties to both sides and sent off home manager Arsene Wenger in injury time.
Jon Moss first pointed to the spot on 93 minutes when Francis Coquelin fouled Ashley Barnes and boyhood Arsenal fan Andre Gray converted for Burnley's equaliser.
Yet Arsenal, who had taken the lead through Shkodran Mustafi but then had Granit Xhaka sent off for a wild challenge on 65 minutes, won a spot kick of their own.
Ben Mee raised his foot to Laurent Koscielny as the Frenchman tried to get on the end of a cross and Alexis Sanchez coolly converted in the eighth minute of added time for the win that takes Arsenal to second in the table.
Yet Wenger could find himself in trouble with the FA for clashing with the fourth official on the touchline after being sent off during the frantic finale.
Chelsea extended their lead at the top of the English Premier League to eight points on Sunday when recalled striker Diego Costa set them on their way to a 2-0 home win over struggling Hull City.
Costa scored shortly before halftime after wing back Victor Moses ran at the Hull defence and found the Spain striker in a crowded penalty area with his cross.
Costa missed last weekend's win at Leicester City with what Chelsea officials said was a back strain. British media reported that a row with backroom staff and a possible lucrative transfer to China were the real reasons behind his absence.
Chelsea captain Gary Cahill made sure of the victory when he headed home unchallenged from a Cesc Fabregas free kick in the 82nd minute.
The win against Hull allowed Chelsea to capitalise on the failure of their closest title rivals to win at the weekend, except for Arsenal who beat Burnley 2-1 earlier on Sunday. Hull remain one place above bottom-placed Sunderland.
Hull midfielder Ryan Mason was taken to hospital after a clash of heads with Cahill in the first half which halted play for almost 10 minutes. Mason left the field on a stretcher holding an oxygen mask and was taken to hospital for checks.
