T7: (counterclockwise) (counterclockwise) u (counterclockwise) (counterclockwise) R2
T8: (turn clockwise) (R2' u) (R U R' u') (R U') (R U R')
To adjust the position of the top side block to return it to its original position, we use the three-cycle method, that is, the left side, the front side and the right side. The top block on three sides moves clockwise or counterclockwise, while the back (side B) does not move. L= left; R= right; B= behind; F= front; U= above; D= bottom surface.
There are many ways to restore the Rubik's cube, such as "layer first", "angle first" and "edge first".
Step 1: make a cross of the same color on the top floor;
Step 2: Return the corner blocks with the same color;
Step 3: put the middle side block in place;
Step 4: Return to the top edge;
Step 5: Return the top edge block;
Step 6: Return to the corner block on the top floor;
Step 7: Return to the corresponding corner block on the top floor.
Extended data:
Different Rubik's Cube has different structures. Take the classic third-order Rubik's Cube as an example. The third-order Rubik's Cube consists of 1 central axis/core ball, 6 central blocks, 12 side blocks and 8 corner blocks. When they are combined together, the parts will contain each other and will not spread out, and either side can rotate horizontally without affecting other squares.
There are more than one structure of the third-order Rubik's cube, such as the hollow Rubik's cube. Some domestic Rubik's Cube players try to modify the structure of the third-order Rubik's Cube to form a Rubik's Cube suitable for racing. These modifications include the modification of contact mode, size, weight, material, color, corner treatment, spring elasticity and so on. These modifications are very successful and are favored by the world's top Rubik's Cube players. However, outside China, these Rubik's cubes will still face the problem of the patent right of the third-order Rubik's cube structure. The following is the structure of a general Rubik's cube.
Baidu encyclopedia-Rubik's cube restoration