Dr. Richard Carr's Blindfold Cubing 3阶盲拧原文

kitor

2.4 Permuting the corners
Throughout it is important to keep updating the mental picture of the permu-
tation.
Corner 8 (DBL corner) is already in position. Consider the D face. If corner
7 (the DBR corner) is in the D face we may correctly position it straight away
using a move of the form P1 or P2 from
http://www.speedcubing.com/final_layer_permutation.html
which is a 3 cycle of edges (look at the diagram to see what this means). The
1 1 2 1 2 2
move would be R- BR- F RB- RF R if corner 7 was in position 5 (the DFR
1 2 1 2 2
position) - it would be FL- FR F- LFR F if the corner 7 was in position 6
(the DFL position). It is important to keep track of where the other 2 corners
that are moved go (by updating you mental permutation).
Instead of memorizing these as separate moves, it is better to get the idea in
principle and work spontaneously. (I would probably rotate the entire cube so
that the D face was U and do the move in the (new) U face and then rotate the
entire cube back again.) If corner 7 is in the U face then rotate the U face (+)so
2 1 1 2 1 1 2 2 2
that it is in the UBL position and use R (R- FR- B RF- R- B R )R and
then undo the rotating of the U face (i.e. undo +). This will position corner 7.
(Note the 3 cycling should be done only in the U and D faces: otherwise you
will have the additionalcomplexityof corners becoming disoriented andyou will
have to reorient them.)
Now, if corner 6 is in the D face it is either in the correct position or not. If it
is not it is in position 5.
2 1 2 1 2 2 2
The move F (RB- RF R- BRF R )F will correctly position corner 6 in the
case it was in position 5.
On the other hand, if corner 6 is in the U face then rotate the U face until it is
i
in the UBR position, using U for some i (possibly it is already there and there
is nothing to do.
2 1 1 2 1 2 2 2 i
Then use F (R- FR- B RF- RB R )F followed by undoing U (i.e. doing
i
U- to correctly position corner 6.
If corner 5 is in the D face it is correctly positioned. If not, it is in the U face.
j
Rotate the U face to get it in the UBL position, using some move U .Then
2 1 2 1 2 2 2 j
F (LF- LB L- FLB L )F followed by U- will position corner 5 correctly.
So now all the corners 1-4 are in the U face. To get corner 1 into the correct
place, if it isn’t already, if it is in position 2 use P2, if it is in position 3 use P1
1
andifitisinposition4use(P2)- .
To get corner 2 into the correct place, if it isn’t already, if it is in position 3 use
1
(P1)- and if it is in position 4 use P2.
Now if corner 3 is in the correct position you cna put the cube down and remove
the blindfold. If you didn’t mess up and the instructions are clear you will have
solved the 2x2x2. It corner 3 is in position 4 there are a couple of strategies:
1 1
firstly use U(P1)- (or U- P1 - it is a matter of taste) or use move P10. The
advantage of P10 is that in bigger cubes you will have moved only two edges
(each consisting of n-2 edge pieces) whereas with the other you will have moved
4 of them (making updating the mental edge permutation map harder) - either
way you will not have spoilt the orientations.
2.5 Putting The Cube Down
Put the cube down. (I always put it down (for any size cube) with the face I
was working with as U face as U face (on top) and the face I was using as F
face towards me.)
2.6 Removing The Blindfold
Remove the blindfold. If you didn’t mess up and the instructions are clear you
will have solved the 2x2x2.
If you can consistently solve the 2x2x2 blindfolded you are ready for the next
stage, the 3x3x3.

[此贴子已经被作者于2006-12-10 13:38:28编辑过]

real747

晕啊

chuan1392010

这么多啊，英语水平还不行。