class Motif:
    # ...
    def coup_simple(self, *args):
        coups = []
        if self.on(*args):
            x, y = self.to_coords(*args)
            for direction in DIRECTIONS:
                motif, arrivee = self.simple(direction, x, y)
                if motif is not None:
                    coups.append((motif, arrivee))
        return coups