1, single chamfer

Formula:

Mr 2 B2 Mr ' U2 Mr ' U2 B2 Mr ' B2 mrb 2 Mr ' B2 mr2 b 2

With this formula, the middle two sides can be turned over.

2. Edge exchange (adjacent edge exchange, adjacent angle exchange and diagonal exchange can all be converted into edge exchange by third-order formula)

Formula: Mr 2 U2 Mr 2 T2 Mr 2 mu 2

First layer reduction

The restoration of the fourth-order Rubik's cube can also be done by the first layer method. The four-level priority method is constantly changing, and it is restored by the formula of the three-level priority method.

The first step is to restore the bottom surface.

Restore the bottom surface: the method is the same as the third order; First, restore a center with four faces; After that, the best way to align the edge is to align the edge from the side of the Rubik's cube and then put it next to the restored center surface. Again, align the four sides, put them on top and align them below, which is very regular and will not cause confusion. Pay attention to their order! Finally, the white square on the right.

The second step is to restore the second floor.

Restore the second floor: in this step, restore the wing first, and then restore the point. The following is the reduction formula for flexibly using the second layer of the third-order Rubik's Cube.