i have to respectfully disagree with bernhardt here - avoiding the use of finger 3 and 4 is impossible (as far as i see). they are absolutely necessary, and their independence is of utmost importance if you don't want to see yourself in the situation of saying "i can't play this, neither this, neither this..."but his right about planning your fingering - that's very important, but the planning shouldn't be oriented on "avoiding" the use of any finger.
What I said is that you should use a fingering that would take advantage of the diferent strengths of the fingers.
What about the independence 3d an 4th fingers?Everyone pianist has met this problem the dificulty of strike the 4th finger controlling simultaneous all the muscles of the finger (without moving the same time the finger next to it) ,only this finger (full indepedence).I haven't obtain this completely yet. Any tips suggestions ?
I partially agree and partially disagree with some of the replies you've received.I agree that (due to the anatomical structure of the tendons) that complete independence of each finger is difficult if not impossible.But I do think that exercises to specifically work on, for example, fingers 4 and 5, can be quite helpful.Think about your dominant hand (for me, my right hand). I naturally have much more independence of my right hand fingers, simply because I use those fingers immensely more. But by practicing piano exercises with the left hand, especially fingers 4 and 5, I have developed a lot more control and independence of those fingers than they had before. I think it's worth investing a few minutes of each practice session into things like LH 4-5 trills and 2,4-3,5 doubles.