1. Cross formula: FRURIUIFI (it may take several times).

Second, change the formula of the same top color: RURIURU2RI (flip angle) (it may take several times).

Third, the corner block homing formula: liuriu2uluiliuerli (you can exchange the positions of the two corner blocks facing you at one time).

Fourth, the back block formula: R2URURIUIRIUIRIURI (the positions of the left, front and right blocks can be interchanged at one time).

recording method

Singmaster notation is a recording method of Rubik's cube rotation, which was invented by David Singmaster, a former professor of mathematics at South Bank University in London, in1978+February. Singmaster notation has become a universal standard, commonly known as "Rubik's cube formula symbol".

Singmaster tag consists of "code number of each layer" and "rotation direction".

Code of each layer: Each layer of the Rubik's Cube is referred to by the English initials. R (right), L (left), U (upper), D (lower), F (front) and B (rear) refer to right, left, top (upper), bottom (lower), front (front) and rear (rear) layers respectively.