Hello, mine isn't exactly a discussion about fingering, but it is still a problem... of fingers: basically, I have quite large hands and in fast octave passages, when playing on the black keys, I tend to graze the fallboard with the third finger of both hands; I find it quite annoying due to the friction that is created. The piano is a Kawai RX2 grand piano. I would be curious to know if this only happens to me (and therefore if it's my fault) or if it is a known issue. Thanks to anyone who will answer me.
I have a very large hand, but that should be more of a solution than a problem. If the hand touches the edge, it is probably tense when you play octaves; try to relax it, the fingers will retract on their own and, having a large hand, playing octaves while relaxed shouldn't be a problem.. So try doing this, try to pay more attention to your hand when you do octave passages.. I take a twelfth and I assure you that it is possible to never touch the edge if you are relaxed and with the correct position
It has happened to me too sometimes and... I confirm what pianothor says. In octaves, in my opinion, not only must you be absolutely relaxed, bringing the body to the right distance (keeping a little distance by not being pressed up against the instrument), but the fingers must make an almost "prehensile" movement on the key... as if to "clutch" it, in short, and furthermore thinking about legato also helps in some way; even if the octaves are staccato, the thought of a legato helps. Finally, the fingers should not be too extended and parallel to the keys.
It must also be said that every person then resolves certain details in their own way based on a thousand factors: hand anatomy, fall on white or black keys, etc.
If the problem were NOT technical, there is the possibility of removing the fallboard (keyboard cover); not all pianos allow it, but it is an option. In one of my pieces for piano, to facilitate the transition between the hitchpin area and the keyboard, I even suggest it in the front matter, because the fallboard could represent an impediment and hinder the fluidity of movements.
First of all, thank you for the answers; Making a more accurate analysis of the problem, I noticed that:
striking an octave rather slowly on the black keys, fingers 2, 3, and 4 are relaxed and naturally curved (no problem).
Increasing the speed (semiquavers), with the same relaxed setting, the centripetal force tends to push the fingers forward until they touch the key cover. For the moment, the alternative is to give up on keeping the hand semi-soft, keeping it rather compact instead (it is possible but requires extra work).
