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Superflip
The superflip is a Rubik's Cube configuration in which all 20 of the movable subcubes (or "cubies") are in the correct permutation, and the eight corners are correctly oriented, but all twelve of the edges are oriented incorrectly ("flipped"). It has been shown that the shortest path between a solved cube and the Superflip position requires 20 moves under the usual half-turn metric (HTM, in which rotating a face 180° counts as a single move), and that no position requires more (although there are many other positions that also require 20 moves).
Under the more restrictive quarter-turn metric (QTM), only 90° face turns are allowed, so 180° turns count as two "moves". In those terms, the Superflip requires 24 moves, and is not maximally distant from the solved state. Instead, when Superflip is composed with the "four-dot" or "four-spot" position, in which four faces have their centers exchanged with the centers on the opposite face, the resulting position is unique in requiring 26 moves under QTM.
==Solution==
This is one possible sequence of moves to generate the Superflip (starting from a solved Rubik's cube), recorded in Singmaster notation. It is the minimal 20 moves in the half-turn metric, though it requires 28 quarter turns:
U R2 F B R B2 R U2 L B2 R U' D' R2 F R' L B2 U2 F2
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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