Arsenal [ Images ] remain untouchable at the top of the league, taking their winning sequence to 11 with a 2-0 home defeat of Bolton Wanderers, who slipped to the bottom.

Second-half goals by Kolo Toure (68') and Tomas Rosicky (80') saw Arsenal clinch another convincing victory.

Didier Drogba's [ Images ] future at Chelsea [ Images ] has been a source of speculation this week but he was on target for the Blues as they continued their improvement with a 2-0 cruise at Middlesbrough.

Earlier, Dirk Kuyt [ Images ] converted two penalties as Liverpool won the Merseyside derby 2-1 against Everton at Goodison Park.

Manchester City [ Images ] moved into second, three points behind Arsenal, with a 1-0 home defeat of Birmingham City [ Images ], although champions Manchester United [ Images ] can reclaim that position with a victory at Aston Villa [ Images ] in a late kickoff.

Elsewhere, Portsmouth stayed fifth with a 2-0 win at Wigan Athletic while Blackburn Rovers consolidated sixth spot with a 4-2 defeat of Reading.

Derby County moved off the bottom with a 0-0 draw at 10-man Fulham [ Images ] although they are still looking for their first away goal.