Substitute Adam Le Fondre scored a late double as Reading fought back from two behind against Chelsea to climb out of the Premier League relegation zone.
Blues midfielder Juan Mata opened the scoring in first-half injury-time with a fierce strike across Adam Federici.
Frank Lampard's thumping header from Mata's corner put third-placed Chelsea firmly in command at the Madejski.
Jonathan PearceBBC Match of the Day commentator
"Chelsea were two goals up with two minutes of normal time to play and Brian McDermott's team got a precious point from a terrific comeback. Again a battling, brave night for the Royals - but Chelsea know they have thrown it away."
But Le Fondre fired in Hope Akpan's pass before guiding in a stoppage-time leveller in a dramatic finale.
Reading knew they only needed a point to move above relegation rivals Wigan and Aston Villa out of the bottom three, but seemed set to remain in danger as Chelsea took command.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.