4x4 Parity Page

You see an "impossible" OLL case, such as a single flipped edge or a "dot" where there should be a line or "L" shape. The Algorithm: The most common algorithm to fix this is: Rw U2 x Rw U2 Rw U2 Rw' U2 Lw U2 Rw' U2 Rw U2 Rw' U2 Rw'

But that alone doesn’t fix parity — it swaps front/back edges but leaves other issues. Let me give the tested, correct algorithm. 4x4 parity

Do a U or U' turn before and after the opposite swap algorithm to turn an adjacent swap into an opposite swap: You see an "impossible" OLL case, such as

On a 4x4, you encounter the (one edge flipped) and PLL Parity (two edges swapped). You see an "impossible" OLL case