Most title assaults are built on goalscorers: think of Manchester City two years ago when Sergio Aguero and Carlos Tevez found harmony in the final few weeks, or last season when Robin Van Persie couldn't miss for Manchester United.
But there are also those built on defence and defenders whose principle motto is 'Thou Shalt Not Pass'.
This is Chelsea, and those defenders who could carry the Blues all the way to the title are John Terry and Gary Cahill.
Their clean sheet against Spurs last week was their seventh in their last 10 games together: 10 games in which Chelsea have conceded only three goals.
And while they are shutting teams out at the back they are finding a way to win.
Like the tennis player who keeps the ball in the court, or the golfer who always finds the fairway, Chelsea stay in the game and wait for their opponents to crumble.
It might not be the sexiest style, but tell that to the fans, who feel vindicated for worshipping Jose Mourinho as their returning messiah.
If they win at Aston Villa on Saturday, Chelsea will have a ten-point lead.
His aim is to convince us, and possibly his own players, that they are not the favourites, that they are the underdog, that they should play without pressure or expectation.
The truth is he's kidding no-one.
You only had to see the smile on Terry's face when we asked him the same question after they had seen off Spurs last week to know what the players really think.
Seven times a Mourinho team has been out in front 29 matches into a season...and seven times they have gone on to become champions.
This is Chelsea's title to lose and they have no intention of doing that.
But from here on in every game is a cup final starting with the visit to Villa.
Set up as they are to play on the counter, some of their most convincing performances have come away from Stamford Bridge.
And they will expect to win, as they have done in their last four meetings with Villa, scoring 16 goals in the process.
Paul Lambert's side are hovering only six points above the relegation places but they haven't slipped into the bottom six since September.
They at last gave their fans some home cheer last time out with a first-half four-goal blast to shoot down the Canaries, but they haven't won back-to-back games at Villa Park for four seasons!
Once again this game will rest on Chelsea's defence, which has only conceded twice in their last six away games.
Terry and Cahill versus the muscular challenge of Benteke: a Christian thrown up against two lions.