Chelsea boss, Antonio Conte, has described the Blues as a different team since their defeats to Arsenal and Liverpool earlier this season following their hard-fought 2-1 win against Tottenham Hotspur on Saturday at Stamford Bridge.
Chelsea's winning streak came under threat when Spurs took the lead through Christian Eriksen.
But goals from Pedro Rodriguez and Victor Moses in each half, secured the win, and condemned Spurs to their first league defeat this season.
Also, the win move Chelsea back to the top of the log on 31 points, ahead of Liverpool and Manchester City who are on 30 points each and are second and third respectively.
"It was a big test for sure. Tottenham is a really good team with great organization," Conte said in his post match analysis.
"Today they started better than us… Then I liked our reaction. It wasn't easy to react on this way. Pedro's goal was a fantastic finish which gave us the right confidence.
"In the second half, we exploited a situation we didn't exploit in the first half. When you win this type of game, a special derby, you must be pleased. From tomorrow, it's important to think of the next game.
"We are another team compared to (when we played) Liverpool and Arsenal.
" I am pleased for the players, we have another type of confidence and are working a lot. They enjoy this type of football," Conte reiterated.
Despite the win, Conte stressed that it was important Chelsea continue working hard as the season is not over yet.
"We have to improve and have a long way in front of us. Above all, after this type of game, it's important to stay humble.
"We won a game against a really strong team. On Saturday we have another and don't forget against Arsenal and Liverpool we lost."