Two goals from Frank Lampard helped maintain Chelsea's Premier League revival and sent Blackpool tumbling to a second successive defeat.
John Terry gave the Blues a first-half lead after jumping unchallenged inside the box to head home a Lampard corner.
Lampard then converted from the spot following Ian Evatt's foul on Salomon Kalou and scored his second from 16 yards when put through by Kalou.
Jason Puncheon hit low beyond Petr Cech late on but it was merely consolation.