Welcome back to Half Spaces, I am Lukas Berndt. Every weekend someone tells me their club should play a back three, and every weekend I ask, what are you willing to pay for it? Because every shape has a bill. Today I have a guest who pays that bill professionally. Fahad Al-Harbi is an assistant coach in the Saudi Pro League, and a few weeks ago his team changed defensive shape three times in one match, on purpose. We talk about the spare man, what wing-backs really cost you in minute 80, how you build up differently against a front two and a front three, and why the formation printed on the team sheet tells you almost nothing. You are listening on Witspeak Podcasts. Let us go to the whiteboard.