learning the H and Z perms

A few days ago, Deadesq (AIC’s first guest blogger) mentioned to me that he was looking for a more efficient solution to the four-headlight situation. By four headlights, he meant the situation in which, after applying the Beginner’s Method PLL corner permutations, you’re left with all four faces having headlights — with no fully solved side face.  As I described in my tutorial, in that situation, the Beginner’s Method requires applying the PLL edge permutation algorithm twice in a row.  Although I can do that quickly, it’s still not as quick as a single permutation. Enter H and Z perms…. Continue reading