Rubik Cross: Difference between revisions

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|<code>U R2 U' L2 U' L2 F2 U2 F2 U' F2 R B' U' F2 L F' U2 R B' L2 U'</code>
|<code>U R2 U' L2 U' L2 F2 U2 F2 U' F2 R B' U' F2 L F' U2 R B' L2 U'</code> [https://alg.cubing.net/?setup=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 <code>z2 R2 D2 U' F R'</code>. Now let's predict the U corners.
* Our cross will be <code>z2 R2 D2 U' F R'</code> [https://alg.cubing.net/?setup=U_R2_U-_L2_U-_L2_F2_U2_F2_U-_F2_R_B-_U-_F2_L_F-_U2_R_B-_L2_U-&alg=z2_R2_D2_U-_F_R-_%2F%2F_cross]. Now let's predict the U corners.
:* ULB: corner won't change after 3rd move. It's given by <code>R2 U'</code>. It's the front-down-right corner (W-O-B).
:* ULB: corner won't change after 3rd move. It's given by <code>R2 U'</code>. It's the front-down-right corner (W-O-B).
:* ULF: corner won't change after 4th move. It's given by <code>R2 D2 F</code>. It's the front-up-right corner (W-R-G).
:* ULF: corner won't change after 4th move. It's given by <code>R2 D2 F</code>. It's the front-up-right corner (W-R-G).

Revision as of 10:06, 23 September 2020

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.