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)