Reminiscent of the classic Arrate finish, so this really should be hard enough to tell who's going to be up there in the GC battle. Would be surprised if Yates doesn't take it on current form, though.
The uncategorised climb at 20k to go is the first half of the side of Pian del Falco used in 2016:
The uncategorised climb at 20k to go is the first half of the side of Pian del Falco used in 2016: