That is, the colors of the other two sides of the four corners of the positioned Rubik's cube are the same as the colors of the corresponding faces. That is, after the above three situations are gradually restored, the six sides of the whole Rubik's cube cannot be restored, but there is an infinite loop between the first and second situations, that is, the second situation becomes the second situation after the completion of the second situation, and the infinite loop phenomenon of the first situation appears.
This special situation does exist, but the probability is very small. If you encounter this situation, I suggest you continue to repeat the first or second situation in the order of the top side of the Rubik's cube. Generally speaking, you can restore the Rubik's cube by repeating it for 3 to 5 times.
Extended data:
The first step to restore the Rubik's cube: put the bottom back, choose the white face as the bottom, and put a cross at the bottom of the Rubik's cube. Trimming is to put a cross on each face. When you spell the cross, you don't rely on the surface, but on the layer. Go back to the first floor, that is, put a cross on the first side. This is very simple, but the spelled cross must be correct, that is, the colors of the four sides of the cross must be the same as the colors of the front, back, left and right center blocks.
The second step of restoring the Rubik's cube: return to the bottom corner, that is, restore the four corner blocks of the first layer of the Rubik's cube. There are five different situations:
The third step of restoring the Rubik's cube: put the second layer of the Rubik's cube back in its original position, which is the step of restoring the four Rubik's cubes in the middle layer. There are three different situations:
The fourth step of restoring the Rubik's cube: the position of the top edge. When doing this step, it depends on the condition of the Rubik's cube, such as "point": after completing this action step, it is a "small turn", so before doing this step, it is necessary to adjust the top layer to the right direction, and so on until the fourth step is completed. Restore the Rubik's cube with a cross.
The fifth step of restoring the Rubik's cube: the vertex position is to adjust all the top surfaces of the four vertices of the Rubik's cube to the top surface.
Restore the Rubik's Cube Step 6: Put the top edge back so that the other side of the four top edges of the Rubik's Cube is the same color as the other four sides. We have finished the sixth step, sorting the four corners of the Rubik's cube.
The seventh step of restoring the Rubik's cube: return to the vertex angle, that is, make the other two faces of the four vertex angles of the positioned Rubik's cube the same color as the corresponding faces.
Baidu encyclopedia-Rubik's cube restoration