Daqing Bao wrote:
Hello everyone, I present you the way how China cubers classify cubes and level of difficulty, this method could only be applied at certain types of cubes.
"Axis" is the classification. Axis: how many directions of rotation when the center stays in position.
"Rank(?)" is the level of difficulty. Rank: number of pieces intersect between two rotating layers.
This "Rank" classification helps designing new cubes.