There can be few criticisms levelled at Antonio Conte's work at Stamford Bridge this season.
He has taken a club in crisis, mayhem, and seemingly dangerous decline, to the brink of an historic Double within a few short months.
And yet, as this campaign has ground towards its conclusion, there have been grumbles about Conte's ability to shake things up when under the cosh. Recently, he has named sides depleted by illness or injury, and found them wanting.
That was the case against Crystal Palace and Manchester United.
In the latter game, there was another issue. Conte's tactics were plainly foundering from early in the game, but he refused to change them.
Chelsea know a thing or two about having a boss who tinkers too much – Roman Abramovich's ownership commenced with just such a coach in Claudio Ranieri – but now, it seemed, the opposite was true.
At Old Trafford, the number being done on Chelsea's creative players was unmistakable from almost the outset. Ander Herrera had Eden Hazard in his pocket, and changes might have usually been expected to counter that.
Conte, though, was sure of his plan.
That much can't really be questioned. It is a plan that has lifted the Blues from mid-table to clear leaders. He has proven his worth, and at present stands almost beyond scrutiny as a result. But that will not have dulled the frustrations, many of which were made clear in the aftermath of that defeat.
And so to Wembley and the FA Cup semi-final against Tottenham.
The team sheet dropped as if it were made of gun metal. Jaws hit the ground alongside it. What was Conte playing at, benching Hazard? And how on earth would his Chelsea overcome Mauricio Pochettino's ascendant Spurs with a side featuring Michy Batshuayi and Nathan Ake.
What we were seeing was Plan B in full effect.
The phases of a well-worked gameplan add another dimension to any tactical set-up, and that is what we saw from Conte at Wembley.
Read the full article on eurosport.co.uk: Conte outsmarted naive Pochettino with the Plan B no one thought he had