Reducing to the group of retaining 3 pairs and 1 1x2x2 block
Foreword
In the end, there is actually not many moves to choose from. To expand one of the completed pairs into a 1x2x2 block, it must be one of the colored 1x2x2 blocks below. The part with the X symbol is the 4 pairs that have been prepared before.
All the rotations of this step only rotate the R, U faces, and do not destroy the 4 pairs that have been completed in the previous steps.
4 pairs expand 3 pairs and 1 1x2x2 block
The following X part is the completed pair.
Combining edge and center
Turn the edge out between the two old pairs
The two pairs to combine block are on the same layer
The two pairs to combine the block are not on the same layer
Of course, you can also choose to combine another block first.
Combining edge and center
Turn the edge out between the two old pairs
The two pairs to combine block are on the same layer
The two pairs to combine the block are not on the same layer
Complete the Cube
When you have expanded into 1 1x2x2 block and 3 pairs according to the previous instructions, without destroying that 1x2x2 block and 3 pairs, there is only one way to turn, following that only way can be completed the cube.
Example
- Turn 1~4 is combined edge and center
- Turn 5~8 is to expand 1x2x2 block
- Turn 9~15 is the only way that does not destroy the pair and that 1x2x2 block. Follow that way to complete
The RUP Method
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