Arsenal maintained their challenge for a first trophy in nine seasons when they beat Liverpool 2-0 at the Emirates Stadium to open up a five-point lead at the top of the Premier League on Saturday.
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A brilliantly taken opener from Santi Cazorla, who smacked in a rebound after 19 minutes, and an even better goal from Aaron Ramsey, who struck a swerving shot with the outside of his right boot after 59 minutes, took Arsenal to 25 points from their 10 matches.
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Chelsea, who lost 2-0 at Newcastle United after winning their previous six games in all competitions, are second, level on 20 points with third-placed Liverpool.
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But Chelsea's performance did not please their boss, Jose Mourinho, who said: "I did not like my team today, I am disappointed."