Understanding Parities

[Noahaha]

My biggest parity problem with a 4x4 is looking ahead. When I get to OLL parity I have two a algs. I like the longer 1-up, 2-up, 3down thing but it will add PLL parity if it isn't there or cancel out PLL if it is. The standard speedsolving alg doesn't do this. If I could see to the next few steps I could avoid one type of parity by choosing the right alg to apply.

I recommend just choosing your favorite one and doing it by default, and only doing the other one when you happen to recognize the case. PLL parity doesn't take *that* long, so it's not worth a couple seconds of recognition to avoid. But if you get an easy case like having permuted edges or corners and you can recognize it quickly, then choose which alg to do.

 

[CubeDude17]

Oh, and for people out there who can't fix 4x4x4 OLL Parity, Here's the algorithm!

Rr2 B2 U2 Ll U2 Rr' U2 Rr U2 F2 Rr F2 Ll' B2 R2

Recognised with this pattern on top:

O_ _O
_O O_
_O O_

 

[JasonK]

Oh, and for people out there who can't fix 4x4x4 OLL Parity, Here's the algorithm!

Rr2 B2 U2 Ll U2 Rr' U2 Rr U2 F2 Rr F2 Ll' B2 R2

Recognised with this pattern on top:

O_ _O
_O O_
_O O_

Or you could use a good algorithm.

r U2 x r U2 r U2 r' U2 l U2 r' U2 r U2 r' U2 r'

 

[cuBerBruce]

Oh, and for people out there who can't fix 4x4x4 OLL Parity, Here's the algorithm!

Rr2 B2 U2 Ll U2 Rr' U2 Rr U2 F2 Rr F2 Ll' B2 R2

I note that you seem to be assuming Rr2 means the same as R2 r2 or (Rr)2. Similar with Rr' and Ll'. If you type that alg text into alg.garron.us, the result is not what you expect.