Long-time Premier League leaders Arsenal passed the first real test of their title credentials after briefly being overtaken by Manchester City but they were indebted to a moment of madness from Everton's Jake O'Brien.
Viktor Gyökeres' first-half penalty -- his first goal in six games -- was enough to restore the Gunners' two-point cushion but in truth they had to do little else for the 1-0 victory.
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