I noticed their solution used a fair number of concurrent opposing side rotations. I don't think these moves are very common unless you specifically optimize for it?
If you have a random sequence of moves then after each move you have 1/5 chance of turning the opposite face. So the fact that in 16 moves sequence they had it twice is roughly expected even if they didn't optimize for it
If you have a random sequence of moves then after each move you have 1/5 chance of turning the opposite face. So the fact that in 16 moves sequence they had it twice is roughly expected even if they didn't optimize for it