## Senin, 31 Agustus 2009

### Penyelesaian Rubiks Cube

Introduction

Ever wonder how to solve a Rubik’s Cube? Well, this guide will teach you with a
simple solution that anyone can understand! Here are some things you should
know before you begin.

Pieces
There are three different kinds of pieces.
Centers
Edges
Corners
In this guide, unimportant parts of the cube are grayed out, and important parts are
marked with X’s.
Many people make the mistake to think that the Rubik’s cube has 54 “stickers” that
need to be solved. In fact, it only has 20 “pieces” (8 corners and 12 edges).

Notation

You will need to learn move notation in order to use this solution.
The six cube faces
will be represented by
right
R
left
L
up
U
down
D
front
F
back
B
R L U D F B
Turns that face clockwise
R’ L’ U’ D’ F’ B’
Turns that face counterclockwise
R2 L2 U2 D2 F2 B2
Turn that face 180 degrees

Method

This guide teaches the layer-by-layer (LBL) method. The first layer is the most
intuitive and the last layer requires the most memorization. There are a total of 11
algorithms in this solution that must be learned in order to solve the Rubik’s cube.

The First Layer

Solving the first layer is a two-step process: solve the edges to make a cross and
then solve the corners. Remember that edges and corners have multiple stickers
and belong in a specific position!
Correct
Incorrect
Solving the cross

This step is the most intuitive step, and it takes the most words to describe
completely. Skip this section if you are able to solve it on your own!
The very first thing you need to do is find an edge you want to solve. This would
be any edge with a white sticker on it.

If the edge is in the second layer

Case 1
Case 2 1. Figure out where the edge belongs by checking the non-white sticker on
the edge. For case 1, the other sticker is red, so the edge must belong in
the right X above the red center. For case 2, the other sticker is green so it
belongs in the front X. Whichever X the edge belongs in is the goal.

2. Figure out how to bring the white sticker to the top. For case 1, an F’
move would bring it to the front X, while for case 2, an R move would
bring it to the right X. Whichever X the white sticker ends up in is the
target.

3. Move the goal into the target with either a U, U’, or U2 move. Then,
move the edge to the target the way you figured out in step 2. Finally,
return the target to the goal by undoing the U, U’, or U2 move you made
before. For case 1, the set of moves would be (U F’ U’). For case 2, the
set of moves would be (U’ R U).

If the edge is in the first or last layer

Use an F or F’ move to bring the edge into the second layer and use the method
above to solve.

Solving the corners

For the remainder of this solution, you will hold the cross on the bottom. This
makes the remaining pieces easier to find.

Again, the first thing you need to do is find a corner you want to solve. This would
be any corner with a white sticker on it.
If the corner is in the last layer
1. Figure out where the corner belongs by checking the two non-white stickers on
the corner. Wherever the corner belongs in is the goal.

2. Bring the corner above the goal by using either a U, U’, or U2 move.

3. Apply one of the following algorithms.

Algorithm
(U R U’ R’)
Algorithm
(U’ F’ U F)
Algorithm
1. (R U’ R’ U2) to get the white sticker on the
side
2. Use one of the algorithms above to solve.
If the corner is in the first layer

Algorithm
1. (R U R’ U’) to get the corner to the last layer.
2. Use the method above to solve.

The Second Layer

The second layer only has four edges that need to be solved. The centers never
move, so they are already solved! First, find an edge to solve: this would be any
remaining edge that does not have a yellow sticker on it.

If the edge is in the last layer

1. Figure out where the edge belongs by checking the two stickers on the
edge. Wherever the edge belongs in is the goal.

2. Bring the edge next to the goal so that the front stickers match by using
either a U, U’, or U2 move.

3. Apply one of the following algorithms.

Algorithm
U (R U’ R’) (U’ F’ U F)
Algorithm
U’ (L’ U L) (U F U’ F’) If the edge is in the second layer

Algorithm
1. (R U’ R’) (U’ F’ U F) to get the edge to the last layer.
2. Use the method above to solve.

The Last Layer

In this beginner solution, the last layer is broken down into four steps and requires
learning four algorithms. For more advanced solutions, it can be broken down into
two steps, but would require learning 78 algorithms.

Orienting the edges

The goal for this step is to make a yellow cross. There are three possible
situations, and this 6-move algorithm will cycle through these in order.

Algorithm (F R U) (R’ U’ F’)

Orienting the corners
The goal for this step is to make all the corners yellow. There are seven possible
situations, and this 7-move algorithm will cycle through these. The following
diagrams are drawn as top-down views, so you must hold the yellow face on top
for these algorithms.

Algorithm (R U) (R’ U) (R U2) R’

Positioning the corners

The goal for this step is to move the corners into the right places. The following
16-move algorithm, executed with yellow on top, will swap two corners as shown.
Use this repeatedly until all the corners are in the right place.

Algorithm
(R U2 R’ U’ R U2) (L’ U R’ U’ L)

Positioning the edges

This is the final step in solving the cube. There are four possible situations, and
this 9-move algorithm will cycle through these.

Algorithm F2 U’ (L R’) F2 (L’ R) U’ F2

NB:

Or in the last step you can use this algoritma R' D R D'

Congratulations! Now you can solve the cube!