A 78th-minute header by David Luiz and a late Ramires goal gave Chelsea a vital 2-0 home win over Manchester City, which took them above their guests into third place in the Premier League on Sunday.
A game of few chances was meandering towards a goalless draw until the Brazilian defender earned a free kick and glanced in Didier Drogba's cross to cap another impressive all-round display.
Midfielder Ramires capped things off with a well-taken breakaway goal in stoppage time.
The win took Chelsea to 54 points, one point and one place above City with a game in hand. Arsenal are second on 58 points with Manchester United top on 63.
Earlier on Sunday, Liverpool maintained their chase for a Europa League slot as a fortunate Dirk Kuyt penalty and a great goal by Luis Suarez secured a comfortable 2-0 win at Sunderland.