Jumat, 02 Desember 2011

cube timer

http://www.cubetimer.com/

rumus rubik 3 layer

3x3 Rubiks Solution

Before reading, you need to understand some notations that I use here. This notation is actually borrowed from the contents of the leaflet found in a 3x3 Rubiks Cube that I bought from Toys R'Us.

[ In addition, I have posted some pictures below, in between the steps. for easier illustration. ]

DiagramNotationDescription
FTurn the front face clockwise (if you have the cube in your hands so that that face is towards you - this also applies to the turns below).
F'Turn the front face anti-clockwise.
RTurn the right face clockwise.
R'Turn the right face anti-clockwise.
LTurn the left face clockwise.
L'Turn the left face anti-clockwise.
UTurn the top face clockwise.
U'Turn the top face anti-clockwise.


There are 12 steps to solve a 3x3 Rubiks Cube, which are listed as follows. And mind you, one step does NOT mean one movement on the cube!


Step 1:
Make one side same color. Also, make the row nearest to the side same color.
FYI, no specific formula to this. In short, you have to think 3-D!! :-P


Step 2:
Make the center of the 4-sides same color as the row nearest to the side that you fixed in Step 1.



Step 3:
Make one of the center cell in row furthest to the side you fixed in Step 1 same color as the center in Step 2.



Step 4:
Use this formula to make the cell in Step 3 fall in place.
- U’ F’ U F U R U’ R’ (Frontside's top row center cube falling to Frontside's center row rightmost cube location)
- U R U’ R’ U’ F’ U F (Rightside's top row center cube falling to Rightside's center row leftmost cube location)

U = Upside, R = Rightside, L = Leftside, F = Frontside. With prime (‘) counter-clockwise.



Step 5:
Continue step 4 till the row that crosses the center of the 4-sides have the same color.


Step 6:
There must be an L-shape with same color on the Upside. Orientate the L so that the edges of L is pointing Leftside and Backside.
- If there is no L, but an “I”, skip steps 6 and 7. The “I” must be horizontal and pass through the center of the Topside.
- If there is 4 L’s (a cross), skip steps 6-8.
- If there is no L, nor “I”, nor cross, add one additional step 7 to form an L or a “I”.



Step 7:
Use this formula to make a horizontal “I” that passes through the center of the Topside.
- F R U R’ U’ F’



Step 8:
Use the same formula in step 7 to make 4 L’s (a cross).



Step 9:
Make one leg of the cross match its side. Then, use this formula to rotate the other 3 to make the 4 legs of the cross match their sides.
- R U R’ U R U U R’ (counter-clockwise)
- R U U R’ U’ R U’ R’ (clockwise)
- Tip: 2 counter-clockwise = 1 clockwise



Step 10:
Find one corner where the 3 sides of corners have same color with their corresponding sides. If all corners are found to match, skip step 11.



Step 11:
Orientate the corner in step 10 so that it is on your top-right-front. Rotate the other 3 corners to make them match by using the formula:
- U R U’ L’ U R’ U’ L (counter-clockwise)
- L’ U R U’ L U R’ U’ (clockwise)
- Tip: 2 counter-clockwise = 1 clockwise



Step 12:
Use the following to rotate 2 corners at the same time.
The 2 corners must be on your top-right, one front, one back
- L U L’ U L U U L’ R’ U’ R U’ R’ U’ U’ R (front clockwise, back counter-clockwise)
- R’ U U R U R’ U R L U’ U’ L’ U’ L U’ L’ (front counter-clockwise, back clockwise)



P.S. I was caught in action solving the 3x3 cube. :-P

Salam kenal