 It is definitely one of the most difficult piano pieces ever written. At the very beginning, to play the repeated notes, there could be different solutions. The best would be, of course, to play the passage as Ravel wrote it, so alternating the first and the two fingers with the left hand alone, like that. But you could play them and some pianists too, with the right hand also, always with these two fingers, or even with one finger alone. So with these tiny movements of the wrist, but it's very important anyway to play on the