Sofa Moving Problem

or If the Movers Had Been Mathematicians

0 > 1 > 2 > 3 > 4 > 5 > 6 > 7 > 8 > 9 > 10 > 11 > 12

The Problem


A nice but yet extremely heavy sofa has to be moved around a right-angled corner where two hallways meet. The sofa is 2 m long and 80 cm wide. The hallways are 1 m wide. Will two lazy movers agree to move the sofa? (They would agree if they do not have to lift or tilt the sofa.)