A lone holding midfielder is a wonderful thing until the press arrives. Then it is a question, and the answer decides whether the whole shape breathes or suffocates.
Option one: the full-back tucks in
The oldest fix in the modern game, and still one of the cleanest.
Build-up is not about having a spare man. It is about having the spare man in the place the pressure is not.
Option two: a centre-half steps out
Riskier, and more rewarding when the timing is right.