Solve the Rubik’s Cube in 20 movements

One of the most famous questions related to Rubik’s Cube is: “How many movements are required to solve the Rubik’s Cube?” That is, what is the minimum number of moves I need to solve any Rubik’s cube position.

It may seem that this is an easy problem to solve using today’s computers. However, a Rubik’s Cube can be in so many different positions, that this problem can not be solved testing positions one by one.

God number is 20

Because of the headaches that caused this issue, the number of moves needed to solve any Rubik’s Cube was called “god number”. In 1981 it was discovered that this number was bounded between 18 and 52. The margin of error was decreased in 1995, reducing the uncertainty between 20 and 29 movements.

Finally, in 2010, 29 years after the first estimation, it was found that the God number was exactly equal to 20. That is, any position of Rubik’s cube can be solved in 20 moves or less. To obtain this number were necessary Group Theory skills (remove symmetries and related positions), and the use of Google supercomputers.

Can I solve the Rubik’s cube in 20 steps?

Because this information is not always given accurately, many people wonder if there is an algorithm they can use to solve the Rubik’s cube in 20 moves. Nope. Keep in mind that even if you can solve the Rubik’s cube in 20 moves, these moves will be completely each time. And because of the large number of possible positions, this knowledge can be useful to solve a Rubik’s cube with a computer, but not for a person.

So if you want to learn how to solve the Rubik’s Cube, you better start by our tutorial

Rubik’s Cube Solutions (without notation)

Years ago, most of the websites used strange notation to show how to solve a Rubik’s Cube. And, nowadays, a lot of the websites are still using them.

notation2

One of the worst things about notations is that you have to learn something before learning how to solve the Rubik’s Cube. As a consequence, many people think that solving the cube is something to difficult for them.

notation

When I started to create this website, I wanted to show the simplest solutions to solve the Rubik’s Cube: no letters, no strange symbols, no notation at all. Only nice pictures.

rubiks cube - step2-c1

Nowadays, there are more websites that also follows the ‘no-notaton’ philosophy. One of them is Rubik’s Solver, that offers a very simple guide to solve the Rubik’s Cube without notation.

And what do you prefer? Notation or no-notation solutions?

It took Erno Rubik one month to solve his own puzzle

erno-rubikDid you know that it took Erno Rubik, the creator of the Rubik’s Cube, more than one month to solve its own creation? In fact, we was not even sure if there was a method to solve it.

But for me, it was a code I myself had invented! Yet I could not read it.

It may seem surprising, but keep in mind that this website did not exist, hehe. Seriously, you have to put yourself in his shoes. Once he creates the Cube, he spends every day trying to solve it. No one had ever solved it. In fact, no one had attempted to solve it. Day after day, without achieving any progress most the days, must be exhausting.

Is like when you decide to go home after a nice walk in which you have seen many lovely sights. I decided it was time to go home, let us put the cubes back in order. And it was at that moment that I came face to face with the Big Challenge: What is the way home?

If you want to learn more about his life, I recommend you to read this Erno Rubik’s Biography.

Life is like a Rubik’s Cube

The Cube is an imitation of life itself – or even an improvement on life. The problems of puzzles are very near the problems of life, our whole life is solving puzzles. If you are hungry, you have to find something to eat. But everyday problems are very mixed – they’re not clear. The Cube’s problem depends just on you. You can solve it independently. But to find happiness in life, you’re not independent. That’s the only big difference.

Erno Rubik, Rubik’s Cube Creator

The Cube and I (Rubik’s Cube Poem)

Last week I bought home a rubiks cube
To test my skill against its might
Well I said this silly toy
This plastic puzzle kids enjoy
Ill solve this night!

The night fled by the dawn arrived
The cube unsolved in disarray
Against each turn and twist
Gave me an aching wrist
As I worked through the day

At last I lined up one side orange
At first this seemed a great success
But it bought me little cheer
But the other five remained I fear
A multicolored mess

Two days flew past then three and four
My work neglected went undone
Though green lined up columns true
How come red was mixed in with the blue?
Does rubik call this fun?

A thousand times I turned the cube
My fingers gripped around its parts
Until the truth at last set in
I didn’t lack the will to win
I simply lacked the smarts

No more I said to rubiks cube
Shall you enslave me in your power?
Thus liberated from its hold
Gave it to a eight year old
Who solved it in a hour

Jarrod Wakefield

Erno Rubik, the inventor of the Rubik’s Cube

erno-rubikErno Rubik, known worldwide as the creator of the Rubik’s Cube, born July 13, 1944 in Budapest (Hungary), during the World War II. Son of a man of science (aerospace engineer) and a woman of letters (poet), Erno Rubik receives influences by both parents that can be seen during the rest of his life. Despite he starts sculpture studies, in 1967 is graduated by the Faculty of Architecture of the Technical College of Budapest, doing postgraduate studies in sculpting and interior architecture. Early in the decade of the 70’s he works as an architect, later to become professor of Interior design at the School of Applied Arts.

Rubik’s Cube as a teaching

Erno is passionate about architecture, which he describes as one of the most complex activities as it combines the features more characteristics of science, technology and art. In his work as a teacher, is convinced that education is the best way to discover and learn, through the constant search for new methods of teaching. And from that quest is how the Cube born.

“Space always intrigued me, with its incredibly rich possibilities, space alteration by (architectural) objects, objects’ transformation in space (sculpture, design), movement in space and in time, their correlation, their repercussion on mankind, the relation between man and space, the object and time. I think the CUBE arose from this interest, from this search for expression and for this always more increased acuteness of these thoughts.”

It is during the spring of 1974 when he has the idea of ​​building a cube of interchangeable pieces. Although he initially thinks to build a 2×2 cube, finally he chooses to construct a 3×3 cube because in this cube the centers remain fixed. He tests different designs, including a failed design with elastic bands to hold the pieces together. In the final prototype pieces stay together because they fit with each other. In this way, he solves the problem of structural design which involved the cube for him, unable to imagine its future popularity as a toy.

Success and fame Rubik’s Cube

With the pleasant feeling of having built something original, something new, Erno Rubik starts to try to solve it. It is not easy. He even doubts if there is a method to solve the puzzle. He thinks he can rotate the faces randomly, but he realizes that the chances are nil. Finally, after more than a month studying the cube, he solves it.

On January 30, 1975 Erno requests a patent for the Rubik’s Cube, originally called the Magic Cube (Buvuos Kocka in Hungarian). The patent is granted in 1977, while the Cube is started to be sold at the end of that year. Quickly becomes very popular in Hungary, and three years later achieved fame throughout the world. Rubik’s Cube fever had begun.

The fame has caused that Erno Rubik is now a private person, not easily accessible and he does not usually appears at Rubik’s Cube events. However, he has continued to design games and puzzles with his own company Rubik Studio, as the Rubik’s Magic, Rubik’s Master Magic, Rubik’s Snake or Rubik’s 360. He also continues teaching at the university and has created the International Rubik Foundation to help talented young engineers and industrial designers.