Chelsea boss Carlo Ancelotti says they must win 15 of their remaining 17 games to successfully defend their Premier League crown.
Under-pressure Ancelotti has calculated it will take at least 80 points to win the title this year.
Ancelotti said: "To win the title from here would be my greatest achievement as a coach.
"We needed 86 points to win it last year. This time it will be less, 80 points could be enough.
"We will try to do that but it will be tough from here. In the Premier League, Manchester United have more possibilities to win the title. They are nine points ahead of us and they also have a match in hand.
"To close the gap on them we obviously have to win both our games against them."
