Rubik Cross

This page is dedicated to solving the cross on the Rubik's cube.

Cross resolution

• Look at edge parity:

• 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' [1]

Our cross will be z2 R2 D2 U' F R' [2]. 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.