How to solve Rubik’s 3x3 cube
History of search for upper and lower number of moves
It was conjectured that the so-called superflip would be a position
that is very difficult.
A Rubik's Cube is in the superflip pattern when each corner and edge piece
is in the correct position, but each edge piece is incorrectly oriented.
In 1992, a solution for the superflip with 20 face turns was found by Dik T. Winter
and its 'minimality' was shown in 1995 by Michael Reid ,
providing a new lower bound for the diameter of the cube group.
e.g. RLU2FU'DF2R2B2LU2F'B'UR2DF2UR2U
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