It looked for all the world like Chelsea were going to drop points again and fall further behind in the Premier League title race.
Crystal Palace had proved to be a stubborn opponent for virtually the entire game, but a lack of concentration from a simple ball in saw the Blues earn all three points.
The game was teetering towards full time when a cross was swung in more in hope that with intent.
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Hakim Ziyech crept in at the back door, and with just a minute left on the clock, calmly side footed home the winner.
Pictures from beIN Sports and NBC Sports Soccer