For more than an hour on Sunday, it looked as though Arsenal would beat London rival Chelsea and give new manager Mikel Arteta his first win in his first home match.
An early goal by Pierre-Emerick Aubameyang gave the Gunners the lead an a vital boost of confidence that carried the hosts deep into the second half.
Then the same horrendous defending that has plagued Arsenal all season reared its ugly head yet again, an error by goalkeeper Bernd Leno allowing the visitors to pull level before Tammy Abraham found a late winner as Chelsea spoiled Arteta’s Emirates Stadium debut with a 2-1 victory.