keeping a relaxed wrist in chords and octaves

[p2u_]

'Any contraction of the extensor, except as it is involved in the stiff-finger co-ordination to combine with the long flexors in locking the three phalanges into a unit, is quite useless for key-depression.' - Arnold Schultz

As I understand it, in nyiregyhazi's case it's not any kind of forceful contraction. Merely an "allowing to unbend". Correct me if I'm wrong, N.?
There are many advantages with this coordination:
* The intrinsic muscles (interosseous and lumbricals in the hand itself) allow the fingers to work independently,
* the movement adapts directly to the movement of the key, thus avoiding friction,
* the muscles are fast and close to the fingers,
* they are extremely sensitive [through proprioceptive feedback] to the weight and movement of the key.

Paul