Re: Rubik's cube - rotation of the centres

On Tue, 27 May 2008 10:49:15 +0200,
whytea <whytea@xxxxxxxxx> wrote:
Tim Woodall wrote:
I've acquired a Rubik's cube which is standard except for one quirk -
some of the squares (including all the centre squares) have writing on
them. This means that five of the six centres only have one correct
rotation. The sixth one (red) is on an otherwise blank face so when
looking at just that face you cannot tell which way around the centre
should be.

This brought back memories when I first encountered the Cube in 1980.
After playing for a few months, I needed a bit more challenge, so I cut
one corner off each of the stickers. That made the orientation matter
for each cublets, which was essentially the same as what you had. (The
Cube is now collecting dust on the shelf)

I got this cube in a mixed up state.

I've now completed the cube and also worked out how to rotate the
centres. (X-1U1X1Z-1X-1U-1X1Z1 will rotate the right centre -90 and
the front centre +90[1])

I actually took a different approach. I solved the first two layers by
putting the cublets in the right position and orientation. As for the
last layer, I'd put the center in the right orientation and move the
corner cublets around. I used to get pretty good speed out of it.

I solve the corners first, then all the edges on opposite sides and
finally the edges on the middle slice.

Doing it that way there are only 8 pieces that aren't (to me) completely
obvious how to solve - the second four corners and the middle four
edges.

Of course, this does mean that I'm not very quick solving it because
most of the work I do without any algorithm and therefore, without the
ability to optimize.

Tim.

--
God said, "div D = rho, div B = 0, curl E = - @B/@t, curl H = J + @D/@t,"
and there was light.

http://tjw.hn.org/ http://www.locofungus.btinternet.co.uk/
.

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