A late VAR reprieve came to Chelsea's rescue as they drew 1-1 away to London rivals West Ham in the Premier League on Saturday.
Tomas Soucek appeared to have secured the Hammers a comeback win in the 82nd minute, but a review showed Declan Rice was offside just before a crucial flick-on to spare Chelsea another defeat.
The Blues had earlier enjoyed arguably their best spell since Graham Potter's appointment during the first 25 minutes, Joao Felix netting a well-worked opener on his return from suspension.
But former Chelsea full-back Emerson Palmieri levelled soon after, and while the visitors dominated much of the following hour, their woes in front of goal meant they were at the mercy of VAR at the end.
Chelsea's purposeful start had West Ham struggling, surviving an early scare when Joao Felix saw a goal disallowed for offside.
But he did put the visitors in front in the 16th minute, tapping in Enzo Fernandez's curling cross from deep on the left.
Kai Havertz's ruled out goal soon after seemed to jolt West Ham – who lost Lucas Paqueta to a shoulder injury – into life.
The equaliser arrived before the half-hour, Emerson pouncing after Jarrod Bowen flicked on Vladimir Coufal's right-wing delivery.
Chelsea were back in the ascendancy after half-time, but clear-cut chances were hard to craft.
It briefly looked like Chelsea would pay for that.
Rice headed on a free-kick delivery and Soucek converted the rebound, but the England man clearly strayed offside.
West Ham had an escape of their own a few moments later when Conor Gallagher's shot struck the hand of the falling Soucek, but no penalty was awarded.
