Rubik’s Cube solved in 25 moves

rubik’s cubeMy wife and I are Rubik’s Cube enthusiasts. While I can solve it in about 5 minutes, my wife can solve it faster one layer at a time. There are many who can solve it in under a minute!

Rubik’s Cube is supposed to be the world’s best-selling toy and over 300 million Rubik’s Cubes and variants (2x2x2, 4x4x4, 5x5x5) have been sold worldwide.

The fastest is Edouard Chambon who has an average solve time of 11.48 seconds and a record of 9.18 seconds!

My personal favourite Rubik’s Cube solver is Jessica Fridrich, a speedcuber whose moves are the most commonly used for speedcubers.

Today, Slashdot linked to an article about how Rubik’s Cube can be solved in just 25 moves!

Stanford mathematician Tomas Rokicki has lowered last year’s record of 26 moves to 25.

According to the article,

Rokicki’s proof is a neat piece of computer science. He’s used the symmetry of the cube to study transformations of the cube in sets, rather than as individual moves. This allows him to separate the “cube space” into 2 billion sets each containing 20 billion elements. He then shows that a large number of these sets are essentially equivalent to other sets and so can be ignored.

If you’re a Rubik’s Cube enthusiast interested in decreasing your solve times, go ahead and read the full article.