I'm looking for a 4x4 Parity alg that is Pureflip, I learnt it a while ago and had a PDF with Setups for Parity OLL but i seemed to have lost it. If anyone knows what the alg is, that would be helpful
I'm aware of guides like that, but none that is a PDF.
But those types of algs are very plentiful. (I could point you to a list with over
350 such algorithms!)
I am guessing that the alg you learned is one of the following two (or their inverses):
r' U2 l F2 l' F2 r2 U2 r U2 r' U2 F2 r2 F2 (25 quarter turns, 15 half turns)
r2 B2 U2 l U2 r' U2 r U2 F2 r F2 l' B2 r2 (25 quarter turns, 15 half turns)
However, they are considered
slow for speedsolving compared to, say, Lucas Parity.
Rw U2 x Rw U2 Rw U2 Rw' U2 Lw U2 Rw' U2 Rw U2 Rw' U2 Rw' (25 quarter turns, 17 half turns)
Yes, that's
not a pure flip version, but the
general form of it,
Rw U2 Rw F2 Rw F2 Lw' U2 Lw U2 Rw' U2 Rw U2 Rw' U2 Rw' (25 quarter turns, 17 half turns)
can be converted into the "pure" form by rewriting all double turns as single inner slice turns (... well, I left some of the turns as double turns, because they can be and the alg is
still "pure"),
Rw U2 Rw F2 2R F2 2L' U2 2L U2 2R' U2 2R U2 Rw' U2 Rw' (25, 17)
Lastly, there are algorithms like cmowla parity (one of mine) which only requires
3 inner slice turns. (All the above require
5 or more.)
x' r2 U2 l' U2 2R U2 l F2 U 2R U' F2 U 2R' U r2 x (23, 16)
(And again, I know of literally several hundred more algs. If you want one with specific types of moves, etc., just ask!)
And I said "pure" in quotes several times, because people actually use that term to describe
supercube safe algorithms - algorithms which do not permute any centers. None of the algorithms above
appear to permute centers, but they do. (They 2 swaps of centers, swapping the same color with the same color.) Algs like the following are what we refer to as
pure. (
Not that I personally care, but others have been pretty "touchy" about it in the past!)
Alg by Ben Whitmore... original post is no longer on the web. Linked to a 4x4x4 supercube applet to show that the net effect does not disrupt
any centers!
2R' U' 2U 2R U' 2R U 2R 2U' 2R' 2U 2R U 2R U' 2R u' 2R' U2 (20, 19)