Chelsea boss Jose Mourinho paid tribute to a dogged Bolton performance after they secured a point after coming from two goals behind at Stamford Bridge.
He said: "I don't think many people in this country like the way Bolton play and I don't like it but we have to be fair. They are a very difficult side.
"They hit long balls up-field and are strong in the air for the first ball.
"They work a lot at set-pieces and they are an effective and dangerous side. It's difficult to play against them."
Mourinho added: "We conceded two goals from set-plays. At 1.30 GMT we were in the dressing room looking at set-plays from Bolton for 20 minutes.
"I showed them everything - corners, throw-ins, free-kicks and we talked about man-to-man marking and responsibility.
"We did all that but what can you do - shoot the ball?"