2x2 ORTEGA/VARASANO TUTORIAL
Finally, we permute both layers (PBL). This may sound intimidating, but there are only five cases, shown below. The top and bottom layers are shown from the perspective above the cube. You may need to use a U move to match one of the cases before using an algorithm.
(top)
(bottom)
(RU2R'U') (RU2L'U) (R'U'R)
Alt: x U2 (R'U'RU2) (L'UR'U'R2)
*T-Perm is also possible
Alt: x U2 (R'U'RU2) (L'UR'U'R2)
*T-Perm is also possible
(top)
(bottom)
(RU'R'U') F2 (U'RUR'D) R2
*Y-Perm is also possible
*Y-Perm is also possible
(top)
(bottom)
(R2U'R2'U2) (F2U'R2)
(top)
(bottom)
(RU'L) U2 (R'UL')
Alt: y2 (R'UR'F2) (RF'R)
Alt: y2 (R'UL') (U2) (RU'L)
Alt: y2 (R'UR'F2) (RF'R)
Alt: y2 (R'UL') (U2) (RU'L)
(top)
(bottom)
R2' F2 R2
Three cases correspond to one of the above cases after rotating the cube with x2:
(top)
(bottom)
x2 (RU2R'U') (RU2L'U) (R'U'R)
(top)
(bottom)
x2 (RU'R'U') F2 (U'RUR'D) R2
(top)
(bottom)
x2 (RU'L) U2 (R'UL')
A final U move may be necessary to solve the cube after using these algorithms.
To bring it all together, check out some example solves.
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