Returns most visited path in go-gui VAR format e.g. 'b r3 w c17...

def mvp_gg(self):
        """ Returns most visited path in go-gui VAR format e.g. 'b r3 w c17..."""
        output = []
        for node in self.most_visited_path_nodes():
            if max(node.child_N) <= 1:
                break
            output.append(coords.to_gtp(coords.from_flat(node.fmove)))
        return ' '.join(output)