Salomon Kalou came off the bench to maintain Chelsea's hold on the FA Cup.
The holders and winners for the past two seasons appeared to be heading for a fourth-round exit at Everton after falling behind to a Louis Saha header.
But Kalou, who had entered the fray just five minutes earlier, booked a replay at Stamford Bridge as he finished off a swift counter-attack 15 minutes from time.
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