The second layer formula: Shangshun-Right Shun-Shanginverse-Right Inverse-Shanginverse-Forward Inverse-Shangshun-Forward Shun.
The third layer formula (cross): right inverse-upper inverse-front inverse-upper shun-front shun-right shun.
The third layer formula (four-corner block): right cis-upper cis-right inverse-upper cis-upper cis 180- right cis-right inverse.
The third layer formula (back to the four corners): right cis-upper cis-right inverse-upper inverse-positive cis-right cis 18- upper inverse-right inverse-right cis-right inverse-positive inverse.
The third level formula (back to the middle): Right Shun-Upper Inverse-Right Shun-Upper Shun-Lower Inverse-Right Inverse-Upper Inverse-Right 180 Note! Shun: Turn 90 degrees clockwise? Reverse: rotate 90 degrees counterclockwise.
(Restoration method of 6-sided 3-order Rubik's Cube)
1. Composition of the Rubik's Cube: The Rubik's Cube has 6 colors and 6 faces, and each face is divided into central blocks (6 in the middle), corner blocks (8 in the four corners) and side blocks (4 in the middle 12).
Among them, the central block has only 1 face, and they are all fixed structures, so the central block is red, so all other reds should be concentrated on this face.
And the red central block is always opposite to the orange central block (stipulated by international standards).
The edge block has two faces and two colors, while the corner block has three faces and three colors.
Second, the definition and operation of each part of the Rubik's Cube. We will use letters to represent each face:
Then use letters to indicate the 1 layer or 1 plane to be rotated, and the direction: for example, r (representing the right side rotates 90 degrees clockwise), R' (representing the right side rotates 90 degrees counterclockwise), and R2 (representing the right side rotates 90 degrees clockwise twice).
The following is the chart:
Finally, the names of each party are relative. For example, F is the front, that is, the side facing you when holding the Rubik's Cube. If you rotate the Rubik's Cube to the other side, the new side will become the front side.
Three, seven steps Rubik's cube recovery formula
First, point the side with the white square in the middle (the side with the Rubik's Cube logo) on the top, and then make a white cross on the top, so that the squares of other colors will go to the corresponding positions (small and complicated, see the figure, pay attention to the above formula and do it right).
2. Then put the white corner well (the cheats are complicated, but it is easier to understand by looking at the picture)
3. Then put the middle side block back in its original position.
Turn the white surface down and find the red and green edge blocks. If the red and green edge blocks are on the top floor, turn the top floor clockwise until the edge blocks are the same as 1 in the figure. Then, according to the formula, the Rubik's cube is rotated to make the side block return to its original position.
If the red and green edge blocks are in the middle layer, but the position or color is wrong, first make the red and green edge blocks in the right front position, and then rotate them 1 time according to one of the following orders.
4. Then adjust the top side block (which should be yellow) upwards to make a yellow cross. If a yellow cross does not appear on the top floor after rotating 1 times according to the formula, you can rotate it repeatedly according to the formula until a yellow cross appears.
5. Then adjust the yellow corner around the cross, which is a bit difficult. See the formula hint.
6. Usually, at this time, the yellow blocks will be misaligned with the color of the side, and the yellow blocks at the four corners will be positioned according to the formula.
7. Finally, adjust the color block on the side to the corresponding position. You're done!
Extended data:
The history of Rubik's cube
1970 In March, Larry Nichols invented the "jigsaw puzzle with rotating pieces in groups" and applied for a Canadian patent. It is a 2×2×2 Rubik's Cube, but each Rubik's Cube is attracted by magnets. 1972 obtained the American patent, two years earlier than Professor rubik's third-order Rubik's Rubik's cube.
give rise to
Ern Rubik is a Hungarian professor of architecture and sculpture. In order to help students understand the composition and structure of the space cube, he made the first prototype of the Rubik's Cube, inspired by the gravel in the Danube.
1974, Professor rubik invented the first Rubik's Cube (then called Rubik's Cube), and obtained the Hungarian patent number HU 170062 in 1975, but did not apply for an international patent. The first Rubik's Cube was sold in a toy store in Budapest in 1977. Unlike Nichols' Rubik's Cube, Professor Rubik's Cube's parts are interlocking like tenons, which are not easily separated by external forces and can be made of any material.
References:
Rubik's cube-Baidu encyclopedia