The Rubik's Cube bottom shelf cross can be self-taught, just the bottom prongs to return to the position of the color order, must be remembered.

1, the bottom prongs of the restoration fixed at the bottom of the completion, in order to save time and steps to go back and forth;

2, the bottom of the color fixed to white, in order to reduce the difficulty of judging the bottom of the prongs of the corresponding relationship between the selection of the other color surface as the bottom can also be;

The bottom corner of the return to the position of the unschooled can also be. However, if you can master some basic formulas, it is beneficial to improve the speed of restoration, the following briefly introduces a few bottom corner block restoration of the formula:

Restoration of the basic idea: the first target corner block to the top side, and then rotate to form a parochial color can be connected to the face of the whole, so that the target corner and the bottom prongs are connected to a (1 × 1 × 2) of the whole of the restoration, and then turned to the correct position. Therefore, the following five examples are not necessary to be memorized as formulas.

The middle layer*** has four prongs, and only four prongs to recover (note that there are no corner blocks in the middle layer), and no homing prongs, and there are only three cases.

1, adjacent to the top prongs in place, place the two adjacent top prongs in the top left rear position, do a formula 4-1 can form a cross;

2, relative top prongs in place, place the two relative top prongs in the top front and rear position, do a formula 4-2 can form a cross;

3, none of the top prongs in place, do a formula 4-1 and then do a formula 4-2 can be formed! Cross

This step we are to make the top four corner blocks of the Rubik's Cube yellow face turned to the top face to come, for the time being, do not consider whether the corner blocks of the correct position, the top of the four corner blocks after the face position.

There are seven situations and four states in which the corner blocks of the Rubik's Cube are not in face position. "Shun" refers to clockwise rotation, so that the corner of the top face color can be turned to the top,), set the "face" corner in the upper left rear position, do a formula 5-2 can be the face position;

3, the two sides of a Shun and a reverse, set the "Shun" corner in the upper left rear position, do a formula 5-2 can be the face position;

3, two sides of a Shun

3, two sides, one smooth and one reversed, put a "smooth" corner in the upper left back position (the top color of the corner is located in the upper back), do the formula 5-1 once, turn to one side, three smooth;

4, no one corner in the face position, put a "reversed" corner in the upper left back position (the top color of the corner is located in the top left side),

The four prongs of the top layer in the face position, the top layer is not correctly positioned. There are six cases in which the position is incorrect and not returned to its place:

1, one to three reverse ("reverse" means that the three prongs can be returned to their place by exchanging them in the counterclockwise direction);

2, one to three straight ("straight" means that the three prongs can be returned to their place by exchanging them in the clockwise direction);

3 can be returned to the position,);

3, two adjacent top prongs or two opposite prongs can be returned to the position, can be through the formula 6-1 or formula 6-2 to one to three smooth or one to three inverse; just this step is more complex, feel the feeling that it is difficult to understand the formula 6-3 and formula 6-4, can be completed very easily.

After the top prongs have been returned to their original positions and the top corners have been placed in their original positions, there are only three situations in which the four top corners have not been returned to their original positions, as shown in the figure below.

1, a return to the three reverse, the "return" corner in the top left front corner position;

2, a return to the three smooth, the "return" corner in the top right front corner position);

3, two pairs of neighboring corners of the swap, any time you do the formula can be converted to A return to three smooth or a return to three reverse.

Follow this method to learn and perfect.