Manchester City moved 11 points clear at the top of the Premier League after a 2-1 win over Manchester United at Old Trafford in their derby clash on Sunday.
City have become the first team to win 14 consecutive English top-flight games in the same season. Their victory ended United's run of 40 home games unbeaten in all competitions.
City went ahead in the 43rd minute when Romelu Lukaku was unable to clear Kevin De Bruyne's inswinging corner and the ball fell to David Silva, who was played onside by Ashley Young. The Spaniard gratefully hooked the ball home.
Poor defending at the other end allowed United to get level before the break. Marcos Rojo hit a hopeful diagonal cross into the City box but Nicolas Otamendi misjudged a header, Fabian Delph hesitated and Marcus Rashford pounced on the loose ball and drove low past Ederson.
Nine minutes after the interval, City grabbed the winner when Silva whipped in a free-kick into the box and Lukaku, who had a derby to forget, drove an attempted clearance into the back of team mate Chris Smalling. The ball looped to Otamendi who, making amends for his earlier mistake, showed great athleticism to volley home on the half-turn.
City had keeper Ederson to thank for the three points after he produced a superb double save at close range six minutes from the end to keep out efforts from Lukaku and Juan Mata.
Everton captain Wayne Rooney scored for the first time in a Merseyside derby on Sunday with a late penalty to take an unlikely point in a 1-1 draw against Liverpool at Anfield.
With the snow swirling, Rooney sent the 77th-minute spot kick straight down the middle after Dominic Calvert-Lewin went down following a push in the back by Croatian defender Dejan Lovren.
Mohamed Salah had earlier fired Liverpool ahead with a 42nd-minute stunner that sent the Egyptian clear of Tottenham Hotspur's England striker Harry Kane as the league's top marksman with 13 goals this season.
Liverpool stayed fourth with 30 points, 13 adrift of leaders Manchester City who were playing later at second-placed Manchester United. Chelsea are third on 32 with Sam Allardyce's Everton moving up to 10th.
Earlier, second half substitute Olivier Giroud rescued Arsenal with a late equaliser on Sunday after Southampton had looked like taking all three points in a 1-1 draw at St Mary's.
France international Giroud, who came off the bench in the 72nd minute to replace compatriot Alexandre Lacazette, made it 1-1 in the 88th with a glancing header into the bottom right corner.
Until then Arsenal had been staring at a second successive league defeat, after a stinging 3-1 loss to Manchester United at the Emirates last weekend. The Gunners moved up to fifth place and behind Liverpool on goal difference.
Southampton had made a dream start with Charlie Austin grabbing his fourth goal in four league games with a third minute shot past Petr Cech after being fed through by Dusan Tadic.
Wayne Rooney scored a late penalty to earn Everton a 1-1 draw at Liverpool.