From:

Subject:

Note: this is a resubmission of my note of Saturday June 6 which

was bit by typo's. Thanks to RP@MIT-MC for pointing them out.

I have been using the following notation for the 4x4 cube:

Name the faces L, R, F, B, U, D. This follows the 3x3 notation. The inner

edges are then l, r, f, b, u, d. The front, upper, right quadrant

consists of one corner cube, FUR, two edge cubes, FUr and FRu, and one

center cube, fur.

Note that the Ideal book uses Lx etc for the mid-slices.

Moves follow 3x3 notation: F moves the front face clockwise, f moves

the front slice clockwise. F' moves counterclockwise.

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The remainder of this message describes two processes for the 4x4 cube.

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The following process rotates three edge cubes. It preserves parity.

(FUl UBl URb) l' RUR'U' l URU'R'

The following process rotates three center cubes. It can be used to

move one center cube between two faces.

(Ful Ulb Urb) l' rUr'U' l UrU'r'

While the center process is sufficient, the edge process will not

organize all edges. It can easily be extended to a process that

moves (FUl to UBl) but that process messes up centers, corners, and

other edges. It also does not do 4-way moves. So the bloody thing

still takes an hour.

Martin Minow

decvax!minow@berkeley