Mine are weak so I do these exercises from time to time. You will find lots of exercises that focus on developing fingers 4 and 5. choosing the fingering to take advantage of the different qualities of each finger. Next comes the matter of equalising the finger strength across the hand vs.
I think they must use their fingers to press down the keys more than they use wrist flexibility, rotation and arm weight. That strength would allow them to play fast pp and ppp passages evenly with ease. (I think that was Horowitz - I might be wrong). In one book I use, the author says some piano players were said to have fingers of steel. Weak fingers are likely to have less control so will recruit compensating actions from muscles in the wrist, arm weight and back. Having strong playing fingers while being able to relax muscles in arm, shoulder, back and in the lower arm for non-playing fingers yields more control - once you get the hang of it. So, playing a legato passage very quietly requires each key to launch the hammer at the strings so that each hammer touches delicately and the key arrives at the key bed before releasing the key to apply the key damper. The premise is: to play precisely you need to control the velocity of the key down action precisely.
I think the finger strength idea comes from the finger independence school of piano techniques. Mine is an amalgam of views that made sense to me.
Billiards plus plus#
This summarises where I have got to in my researches (from respected piano technique books and some YouTube piano teachers plus a laws-of-physics/engineering mind). I am still trying to develop a clear idea myself.
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