Ruben Castro got a bizarre winner when he pounced on an error by goalkeeper Jaime.
With the goal gaping, the nearest defender opted to turn round and appeal for offside rather than attempt to prevent Castro finding the net.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.