1, adjacent angle change?
A left (r 'f r f') (rou2r') u (rou2r')?
A backward R' F R' F2 (R U' R') F2 R2?
A right R2 F2(R U R ')F2 R F' R?
2. Diagonal exchange: r u' r u' F2 u' r u' F2. R U R' F2 R F' U R' F2 R F' R (optional)
3、EG 1？ Case?
Two backward (R2 U' R2') U2' F2 U' R2?
Two forward R2 U' B2 U2' (R2 U' R2')?
EG2？ Case?
A rear roof (R' U R') F2 (R F' R)?
A front roof (R' F R') F2 (R U' R)?
One by one? (R U' R' U') R' F2 U' R U R？
Extended data:
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. Others have some second-order patents on patterns, such as Mickey head and K ball.
Baidu encyclopedia-second order Rubik's cube