Unless I'm mistaken, I can't find anything in The AB Guide to Music Theory or First Steps in Music Theory: Grades 1 to 5 which defines the stem direction rules for chords and groups of beamed/grouped notes. The only information these ABRSM publications give is for single notes.
I did a grade 5 practice paper this evening and the model answer for a horn-in-F transposition question gives a group of 4 semiquavers with a different stem direction to mine. I'm worried about this for the real exam as the ABRSM marking criteria explicitly mentions correct positions of note stem directions.
From what I can tell, American publications seem to use the rule that if the average note position is below the middle line then the stems should go up, and vice versa. Does anyone know if ABRSM adopt this convention too, or indeed what is the rule they apply when marking theory papers?
Thanks in advance.