Further question: Do I play this with flat fingers or curved fingers?
I have a recent story about that.
I have had a teacher in another country for some months who told me to play this etude mostly with flat fingers, "because it is the style of the piece" but in a practical way, without dogmatisms (if I wanted to play it at some moments with curved fingers it was ok).
Now I am back to my country (Spain) and yesterday I showed the piece to my usual teacher here. He has a very good Russian teacher and plays regularly with curved fingers.
First, he placed some comments about minimising the left hand movements to make it easier, because I used to miss some notes.
Then he told me that it was no good to "mix" movements. I have to decide between playing generally with curved fingers or with flat fingers. But not both, because:
1) This piece demands homogeneity, fluent way of playing, relax. May be it can only be achieved by a unified style.
2) If I acquire a fluid, homogeneus style, other pieces should be easier to learn, because the general aproach to the keyboard is already learned - that is , I would not need specific solutions, I would just play mostly all the time at the "usual" style position (flat or curved)-.
Of course, I have no choice . I will learn to play it with curved fingers because it is the best way my teacher can teach me. The "practical" approach (specific solutions for every difficult moment) does not impress him at all.
But I would like to get some advice about this interesting question.
(Please suppose some common sense in my actual teacher).
Thanks.