In this step of restoration, you must remember the placement rules of "top 2 left 4". First, you must be familiar with this concept, and then you will talk about how to use this rule. Skillful use of this rule will soon recover.
When two pieces of top yellow are not restored, the unreduced corner block should be placed in the lower left corner of the top floor, and the yellow facet of the corner block should face forward; When the four top yellow pieces are not restored, the unreduced corner pieces should be placed in the lower left corner of the top floor, and the yellow facets of the corner pieces should face left.
These two small fish formulas are the second most important formulas after the two basic formulas, because they are also used in the last step, and they are also the mirror images of a pair of right and left hands. They are slightly more complicated than the basic formulas, and they are not particularly difficult to remember, so you must master them skillfully.
Introduction to Rubik's cube
The Rubik's Cube was invented by Hungarian sculptor and architecture professor rubik Elnor in 1974. Shortly after its appearance, many similar toys appeared, some from the inventor rubik, including the second, fourth and fifth versions of the Rubik's Cube. Some of them were written by others.
The original third-order Rubik's Cube consists of six faces. In the current mainstream color matching of Rubik's Cube, the colors of six faces are white, red, blue, orange, green and yellow. White is opposite to yellow, blue is opposite to green, orange is opposite to red, and red, white and blue are arranged clockwise.
In order to help students understand the composition and structure of the space cube, rubik Elnor made the first prototype of the cube himself. Professor rubik invented the first Rubik's Cube in 1974 and obtained the Hungarian patent in 1975.
In the late 1970s, Rubik's Cube became more and more popular in Hungary. However, under the rule of the Hungarian people, import and export were strictly restricted, and rubik could only promote the Rubik's Cube through the International Toy Fair.
1979 In September, IdealToys introduced the Rubik's Cube to the world, and made its debut at the international toy fairs in London, Paris and the United States in February and October. 1 980.