It was easy - a combination of 5-layers octagons (to reduce 5 layers to 3=
) and 3-layer dodecahedron. 857 twists.=20
Hint for future solvers: if you are going to solve 3C after 2C, it's bett=
er first set proper orientation for all 3C's relative to the current "equat=
or" (by moving of wrong-oriented pieces to another hemisphere) and then wor=
k in one hemisphere without other crossings of equator :)
Good luck!
Andrey