THOMAS Tuchel decided to use a formation on Sunday that he had never used before as a starting Xl as Chelsea boss.
And he did it in what was perhaps one of the most important games of the season for Chelsea so far - in terms of the Premier League anyway.
Bold? Brave? Silly? Risky? Genius? You can ask a lot of questions about the decision to do this in the 2-0 win over Tottenham on Sunday.
But for me, it once again just shows the tenacity and tactical genius of this man.
He literally trumped Antonio Conte and outfoxed him once again, and it's not the first time in the last few weeks that he has done this.
Having faced Tottenham three times in a matter of weeks now, he has basically changed his formation on every occasion.
Playing the same team so often in a short space of time can be detrimental because you know exactly how they play and exactly how they line up.
So how do you conquer that? You change your formation, and it has worked a treat for Tuchel in his battle with Conte recently.
When he went 4-4-2 recently in the Carabao Cup semi-final, Conte decided to match that at half time after Chelsea were dominating, and it did help his side grow back into the tie.