  We discuss in detail two recently proposed relations between the Parrondo's
games and the Fokker--Planck equation describing the flashing ratchet as the
overdamped motion of a particle in a potential landscape. In both cases it is
possible to relate exactly the probabilities of the games to the potential in
which the overdamped particle moves. We will discuss under which conditions
current-less potentials correspond to fair games and vice versa.
