posetcay:
Removed A17-A16 since too many moves work afterwards, not a good resistance.

irnbru:
The puzzle is big enough that the site can't tell if the coordinates are for the top or the bottom, so it can fail in its auto-adjustment. I mean top left orientation, A12 B14 C15 C14 A13 A14 B15

irnbru:
Also A12 B14 C15 C14 A13 A14 B15

irnbru:
I mean this position. + A13

irnbru:
A17 B15 C14 C15 A16 is accepted however its mirror image A12 B14 C15 C14 A13 is not (is there a difference?)