When playing a scale on the left hand, c,d,(e) counterbass of c
f,g,(a) counterbass of f, a,b (counterbass of g) c
fingering: 3 2 3 4 2 4 2 3
3C covers 3E 2D 2F covers 4A 2G covers 2B
3C
This fingering for scales makes it faster and is pattern fingering.