Empty octaves are mostly played with the thumb on one side. That´s why we don´t write it´s number but write the possible fingers 3 or 4 or 5 in the normal five-finger-position-way (see also example 10):
Filled octaveshave always finger 1 and 5 at the edges, if they have three voices you write only the middle voice, if they have four voices it is only necessary to write if you take finger 3 or 4 because you always need 2. Lines over and under a number show that the number relates to the middle of a chord (see also example 14).
In special cases you can relate a line of chords also on a five-finger-position with exceptions:
At the often-used octave-arpeggio in the same sense the octave grip is marked not with 1 and 5 but easier visible with the so-called octave-bracket which contains the necessary middle-numbers 2 or 3 or 4.
At arpeggio over more than one Oktave you can make a little sharp edge at the beginning of the bracket to indicate over-size:
Sometimes it makes sense for an exposed note to give it a better “appoggio” maybe for pianissimo playing by using two or more fingers! This will be marked with 1+2 or with 2+(3) if one of the fingers will be released right after the note.
E.g. with wandering sixths the division of the hand is symbolized by two numbers above each other separated by a line; and until the next position you continue with two-finger-positions (one may have even three…).
With this way of writing you save nearly half of the numbers of a conventional fingering as it is often seen, and you recognize at once where the hand goes.
The dividedposition can also appear one part after another: This will be made clear with a longer line:
If one part of a divided position finishes and the hand continues to play in the other part, the separation line will edge down or up to the finishing side:
Especially in impressionistic literature when hands disturb each other because of place restriction I connect the two note-heads with a zig-zag-line to give the attention a “flash” on this collision danger. If in this context a hand must rapidly move upwards or downwards I put a vertical arrow.
It cancels all exceptions of before. Logical that it has to be followed by a finger position number.
The mini-clear-sign starting directly from the head of a note shows that it has to be finished earlier than its value for reasons of technical realisation of a passage; it has to be stopped at the moment of the vertical line (see example 24 and 28).