25 August 2008

Rubik's Cube

The Rubik's Cube is a mechanical puzzle invented in 1974 by Hungarian sculptor and professor of architecture Ernő Rubik. Originally called the "Magic Cube" by its inventor, this puzzle was renamed "Rubik's Cube" by Ideal Toys in 1980 and won the German Game of the Year special award for Best Puzzle that year. It is said to be the world's best-selling toy, with over 300,000,000 Rubik's Cubes and imitations sold worldwide.
There exist four widely available variations: the 2×2×2, the standard 3×3×3 cube, the 4×4×4, and the 5×5×5.
The invention, descendant of a first prototype of only two layers, is a type of puzzle which consist of a cube in which each of its six faces is divided in nine parts, 3x3, which conforms a total of 26 pieces (there is no central piece) that articulate to each other by the mechanism of the central inner piece, hides inside the cube. The rest of the pieces are visible and three types can be observed that do not lose their
condition throughout the multiple movements that are realized.
These pieces are:
6 central pieces of face, define the color that corresponds to each face and always maintain the relative direction among them, are of a single color. In the original model the white color was opposite to the yellow, red to the orange and the green one to the blue one.
12 pieces edge, are in the edges and are of two colors.
8 pieces vertex, are in the corners and are of three colors.
Many solutions for Rubik’s cube are shortage of independent way. The most popular method was developed by David Singmaster in 1981. This solution consists of solving the Bucket castrates by layer: to that Superior is called, it is solved first, followed of the one of in the middle, and finally the Inferior. After certain practice it is possible to less than solve the bucket in 1 minute. (This is the way that I use).

I’ve chosen this topic for my free entry, because this summer I’ve solved the Rubik’s cube, and also the 2x2 cube and the 4x4.