This page is dedicated to solving the cross on the Rubik's cube.
Cross resolution
- Opposite colors have same parity. Adjacent colors have opposite parities.
- Flipping an edge change its parity.
Cross to F2L
Drill:
- Find the best cross, and list explicitly the moves mentally.
- Predict the moves of every corners, and in particular focus on the corners that will end on the U face.
- From the move list, tell which corners will not move.
Resolution examples
U R2 U' L2 U' L2 F2 U2 F2 U' F2 R B' U' F2 L F' U2 R B' L2 U'
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- Our cross will be
z2 R2 D2 U' F R'. Now let's predict the U corners.
- ULB: corner won't change after 3rd move. It's given by
R2 U'. It's the front-down-right corner (W-O-B).
- ULF: corner won't change after 4th move. It's given by
R2 D2 F. It's the front-up-right corner (W-R-G).
- URF: given by
R2 U' R', so it's the back-down-right corner (Y-O-G).
- URB: given by
D2 R', so it's the front-down-left corner (W-G-O).
- To predict we can also use inverse solution
R F' U D2 R2, and see where the U corners comes from. We see that the F face has 3 (except top left), and R face has the 4th (bottom) source corners.
- We can also track all white corners when doing the cross mentally, or keeping our fingers on the cube. Simplest though seems to track each corner individually.
- W-R-G will end up on front-up-left, white sticker front.
- W-O-B will end up on back-up-left, white sticker left.
- W-G-O will end up on back-up-right, white sticker back.
- W-B-R will end up on front-down-left, white sticker front.
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