Pocket cube, also known as pocket cube, mini cube, small cube and ice cube, is a 2×2×2 cube structure. There are only eight corner blocks in itself, and there are no squares with other structures. The structure is similar to the third-order Rubik's cube, which can be restored by the formula of restoring the third-order Rubik's cube.
Total change:
The second-order Rubik's Cube has eight corners! /24= 1680 positions are arranged, and each arrangement has 1 107 color orientations (color orientations are conserved when twisting, and most theoretical color orientations of the 8th power of 3 are impossible), that is, after the second-order Rubik's cube is disrupted, there is1680 */kloc-0.
Production patent:
The earliest patent of the second-order Rubik's Cube was applied by Professor rubik Arne on March 29th, 1983/kloc-0. The U.S. patent number is 4378 1 17, which we used to call the second-order Rubik's cube with R structure.
Li Yu 198 10/kloc-0 of Taiwan Province Eastsheen Company applied for a second-class patent of another structure on October 27th. The U.S. patent number is an American patent. 5,826,871.571,we are used to calling it the second-order Rubik's cube with Dongxin structure.
Restore method:
The second-order Rubik's cube has only eight corner blocks, which can be restored by using part of the principle of "hierarchical priority method of third-order Rubik's cube"
Stage 1: Restore the top floor.
The second stage: turn over the bottom corner block and align the background color.
The third stage: adjust the position of the bottom corner block and restore it.