From cube-lovers-errors@mc.lcs.mit.edu Mon Dec 14 15:00:05 1998
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Date: Thu, 10 Dec 1998 23:04:10 -0500
From: michael reid
Message-Id: <199812110404.XAA03343@cauchy.math.brown.edu>
To: cube-lovers@ai.mit.edu
Subject: fixing edge parity on 4x4x4
several people have posted maneuvers for "fixing" the edge parity
on rubik's revenge. i haven't seen any maneuvers as short as
mine (although there might be some disagreement about "length").
recall that i am using the notation _R_ (R underscored) to mean
turn the outer two layers together.
to switch the two UF edges:
_R2_ B2 L U2 l U2 r' U2 r U2 F2 r F2 _L'_ B2 _R2_
side effects: rotates the set of 4 U centers by 180 degrees.
also makes a 4-cycle of internal (0 faces visible) cubies.
if you're not concerned about moving centers, use
_(R2 B)_ u _(B' D2 B)_ u' _B_ l _(B2 D2 R2)_
here, _( ... )_ means the whole thing inside the parentheses
is underlined.
the maneuver that i normally use, since it's appropriate for
my solving method, is
U2 (r U2)^5
which makes a 4-cycle of edges in the r-slice (and also
rotates the set of 4 U centers by 180 degrees). this one
is short and easy to remember!
these maneuvers all work well on the 5x5x5 also.
mike