Terry incident -RSB- after the game but he 's said it hit his shoulder . He needs to take another look at that . '' Chelsea boss Carlo Ancelotti chose not to comment on the incidents . `` It is not my job to judge the work of the officials , '' the Italian said . `` It is a difficult job , sometimes they make the right decisions , sometimes they make bad decisions . `` We have to maintain this level . We are doing well , we are very focused and in a very good position , but we have a very difficult game on Saturday against Tottenham and we have to do our best to win that game . '' Chelsea were less impressive in the first half , and it took until the 43rd minute before France striker Anelka broke the deadlock with a close-range header from Drogba 's left-wing cross for his first goal since January . Bolton striker Kevin Davies had told reporters before the match that his former teammate Anelka was unhappy playing with Drogba , but the duo combined well to end Wanderers ' stubborn resistance . The recalled Salomon Kalou
-LRB- CNN -RRB- -- Chelsea moved a step closer to breaking Manchester United 's stranglehold on the English Premier League title with a controversial 1-0 victory at home to Bolton Wanderers on Tuesday night . Nicolas Anelka headed the only goal against his former club just before halftime to put the London side four points clear of three-time defending champions United with four matches to play . Third-placed Arsenal can leapfrog United into second place with victory over London rivals Tottenham on Wednesday and be three points adrift of Chelsea . Bolton , just five points above the relegation zone , were angry after not being awarded a penalty in each half for alleged handball by Didier Drogba and John Terry -- but were lucky not to concede more goals as Chelsea dominated late in the match . `` They were n't claims for a penalty , '' Bolton boss Owen Coyle told match broadcaster ESPN . `` They were stonewall penalties . I knew it at the time . `` Didier Drogba is a world-class player , but looking at this replay he could be a world-class volleyball player . `` I 've asked the linesman about -LSB- the