The Right state: we have no criticisms to make of the Left’s poem. The Left state: we wonder about the Right’s use of ‘the deeps and shallows have no rest’ (fuchi se himanaki).
In judgement: ‘Mogami River’ appears to be technically accomplished, but the final section sounds excessive. The deeps and shallows of Asuka River, indeed, do change constantly. The final section, too, seems fine. Thus, the Right wins.