Chelsea endured a third successive goalless draw in an enthralling encounter against excellent 10-man Leicester.
Antonio Conte had been wary of the Foxes and his concern proved well founded as the movement and energy of Riyad Mahrez, Jamie Vardy and Shinji Okazaki troubled Chelsea.
Leicester were relentless, playing like champions, with the intensity of their pressing forcing mistakes, but Ben Chilwell was sent off for two bookable offences in quick succession, leaving the visitors down to 10 men with 22 minutes remaining.
Yet still Chelsea, who had won their previous seven Premier League home games since September's loss to Manchester City, could not break the Foxes down as the Blues followed stalemates with Norwich and Arsenal with a third in a week.