Chelsea had won its first nine matches in this season's English Premier League, prompting manager Jose Mourinho to boast that his team would win the title by the end of the year.
The defending champions may have to wait a little longer after Sunday's 1-1 draw at Everton -- a match that Mourinho believes should have been a win because Didier Drogba's potential match-winning goal was ruled offside.
"We didn't win? For me it was 2-1," Mourinho said. "We scored two goals, two beautiful goals. Normally this is a victory. For me, for my players, for our feelings, we won the game."
Everton took the lead when James Beattie scored from the penalty spot in the 36th minute. The Toffees earned the penalty when Shaun Wright-Phillips brought down Tim Cahill.
The goal was only the fourth conceded by Chelsea in 10 league games.
Frank Lampard equalized in the 50th minute after chasing a loose ball and scoring from long range. Chelsea had the ball in the net 14 minutes later, but Drogba was whistled for being offside.
"You should ask the linesman why it was not a goal because if he has some doubts, you always have to protect the attacking team," Mourinho said. "If he has no doubts and he disallows the goal, you know, glasses, I don't know.
"Managers, referees and linesman all make mistakes. But it leaves a taste in the mouth."
Chelsea still has a sizable lead, however, with 28 points from 10 matches. Charlton, Tottenham and Wigan all have 19, with the traditional title contenders further back.
Manchester United trails by 10 points, while Arsenal is 12 points back and European champion Liverpool needs 18 points to catch the Blues.
Chelsea did extend its unbeaten league streak to 39 matches -- aiming for Arsenal's record of 49.
Everton finished fourth last season, but has struggled this season, with only four points from nine matches.
"Obviously we're bottom and not doing very well but we showed what we're made of today," Beattie said. "Chelsea had a lot of possession, probably 70 percent but we sucked it up at the back and I thought we did really well today."
Earlier, Emre Belozoglu scored the winning goal to lead Newcastle over local rival Sunderland 3-2. In the first half, the two teams traded two goals each in an eight-minute span.
Also, Bolton beat West Bromwich Albion 2-0 and West Ham topped Middlesbrough 2-1.
Shola Ameobi, who started in place of the injured Michael Owen, scored the first goal at St. James' Park in the 34th minute by heading in a corner from Emre.
Seven minutes later, the score was 2-2.
Liam Lawrence leveled in the 35th, and Ameobi put Newcastle in the lead again in the 37th. The Black Cats equalized through Stephen Elliott in the 41st.
Emre scored the winner in the 63rd with his first goal for the club since joining from Inter Milan in July. He curled a free kick in off the post and then ran to embrace Newcastle manager Graeme Souness on the touchline.
At Upton Park, former England striker Teddy Sheringham scored for West Ham in the 66th minute.
Middlesbrough's Chris Riggott scored an own-goal in the 74th minute to give West Ham a 2-0 lead. 'Boro goalkeeper Mark Schwarzer made a save on the line, but a linesman ruled the ball had crossed and a goal was awarded. Franck Queudrue pulled a goal back for 'Boro in the 87th.
West Brom missed a twice-taken penalty in the first half at the Reebok Stadium. Diomansy Kamara's first spot kick was ruled out for an infringement and he sent the second attempt over the bar.
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