The reduction method of Rubik's pyramid cube

First to unify the terminology, the pyramid cube has four small corner blocks that can rotate themselves, respectively with four small corner blocks as vertices, is four large corner blocks, we call these four large corner blocks respectively, the upper corner block, the left corner block, the right corner block and the back corner block. In addition to the small corner blocks of the vertices that have been introduced, the remaining three corner blocks are the edges of this pyramid cube. Count them, a pyramid cube has six edges, and each side has three edges. Let's look at the last three pieces of each big horn block that are not introduced, yes, that is the three pieces in the middle, let's call it the face block, a pyramid cube has 12 face blocks, each side has 3 face blocks. So, just to recap, the corner block has three colors. The large corner block is a two-layer tower with the small corner block as the apex, which is also three colors. The edge block is the remaining three corners of the large horn block, and the edge block has only two colors. The block has only one color. Left: Looking clockwise from the top down; To the right: From the top down look at the Rubik's cube counterclockwise; Upward: From right to left to see the Rubik's cube clockwise, from left to right to see the Rubik's cube counterclockwise; Down: Look at the Rubik's cube counterclockwise from right to left and clockwise from left to right

Not any Rubik's cube, it is a layer by layer, not a side by side. Let's start with the blue as the base, put together the blue layer and the three blue corners to determine which side is blue, so let's start with the blue side

The three large corner blocks can be turned arbitrarily until the blue block of each large corner block turns to this blue face, at this time the three small corner blocks turn disorderly, it doesn't matter, and finally turn the small corner block separately. The final result of this step is that there are at least 6 colors restored on the bottom of the blue. That is, the blue surface blocks all return, and the blue corner blocks also return

Restore the blue edge Put the blue bottom side on the bottom side, and see if there is a blue edge on the top corner block. At this point, the color of the bottom two face blocks of the pyramid determines the color of this layer. There are two yellow face blocks in front of the bottom layer, then this one is the yellow face. The first step to determine which side is which color will only occur in the following three situations: A: Take the restoration of the blue-green edge block as an example, first align the green block of the blue-green edge block to be restored with the bottom layer block of the known green surface, turn the right corner block upward, then turn the upper corner block right, and then restore the right corner block just turned upward, that is, turn the right corner block downward B: Again take the blue and yellow edge block as an example, similarly, first align the yellow face of the returning blue and yellow edge block with the bottom yellow face block of the known yellow face, turn up the left corner block, turn left the upper corner block, and then turn down the left corner block C: Take the blue and red edge block as an example, at this time, the blue and red edge block to be restored is not in the position of the upper corner block, but in the position of the bottom block, it is very simple, as long as the blue and red block is switched to the position we are familiar with. Turn up the left corner block, turn right the top corner block, turn down the left corner block (up the right corner, to the top left corner, down the right corner) and then use the formula A or B depending on the situation

Restoring the color of each corner block only needs to turn the top corner block, because turning the top corner block does not affect the bottom layer we just finished.

There are four situations when the three edges of the upper corner block are restored. A: The color of one side of the two edges is good. In the figure, the yellow side of the yellow and green edges and the red side of the red and green edges are aligned. In this case, put the edge that is not aligned on either side behind you, and the red side of the red-green edge and the green side of the yellow-green edge are right in front of you. (Down to the right corner, down to the left corner, up to the right corner, up to the left corner), after this formula is used, you will find that the bottom blue block has become the situation in step 4, it doesn't matter, and use the formula in step 4 again. B: Only one of the three edges is aligned on both sides, and the color of the remaining two edges is disordered. In this case. Take any side as the front and use the formula for case A once. C: None of the three edges is right, but it is very regular, as shown in the figure, the red and green edges and the red and yellow edges can be extended clockwise to return, and the green and yellow edges and the green and red edges can be extended clockwise to return, similarly, the yellow and green edges and the yellow and red edges can be returned clockwise, in this case, only one formula can be used. In front of any face, (down the right corner, to the upper right corner, up the right corner, to the upper right corner, down the right corner, to the upper right corner, up the right corner) D: similar to C, except that the edges are not clockwise, they are counterclockwise. As shown in the figure, the yellow and red edges and the yellow and green edges can be returned counterclockwise. A formula is also used in this case. In front of any face, (down left corner, up left corner, up left corner, up left corner, down left corner, up left corner)

Generally, the pyramid cube will be completely restored by this time, if the top corner block has not been restored, just turn it.