Germany’s Wolfgang Schaeuble, the “immovable object” in the words of one economist, stopped Greece’s charismatic new finance minister Yanis Varoufakis in his tracks, forcing Athens to extend a bailout program on Friday on terms its government was just elected to get out of. The new Greek found itself without a single firm ally among 18 euro zone peers in its drive to reverse austerity and renegotiate its debt pile.