cubeobsession
Member
I have become obsessed with the Rubik's Cube and put together the following website - Cube Obsession
A new website
- Thread starter cubeobsession
- Start date
Me
Veteran
looks ok not much content though
Athefre
Veteran
- Joined
- Jul 25, 2006
- Messages
- 1,335
It's a nice looking site. I like the layout.
Add a list of some available speedcubing methods including Roux, Heise, and Salvia.
Add a list of some available speedcubing methods including Roux, Heise, and Salvia.
cubeobsession
Member
Thanks for the feedback. It is a new website so I do plan on adding some extra content. I am planning on putting together an advanced method for solving the Rubik's Cube. And it will most likely be the fridrich method.
Stefan
Legend
Where did you get the 22 moves from?
tenderchkn
Regular
- Joined
- Aug 11, 2006
- Messages
- 174
From outdated sources.
cubeobsession
Member
My sources may be outdated, but checkout Rubik's Official Online Site. On this webpage, it is stated that the minimal number of moves may be in the low twenties.
Stefan
Legend
How to get from "may turn out to be somewhere in the low twenties" to "22 is"?
AvGalen
Premium Member
I don't know where he got the 22 number, but I thought that the following was proven:
Max 30: by Herbert Kociemba's "suboptimal" solver (12+18)
Max 29: by proving that all sequences that required 18 moves could be solved in 29 total
Max 28: Read it somewhere, but don't remember the details
Min 20: Because the 12-flip requires 20 moves.
Furthermore, intuition / statistics / http://cubezzz.homelinux.org/drupal/?q=node/view/63 all suggest that 20 will actually be the number, but no prove.
Max 30: by Herbert Kociemba's "suboptimal" solver (12+18)
Max 29: by proving that all sequences that required 18 moves could be solved in 29 total
Max 28: Read it somewhere, but don't remember the details
Min 20: Because the 12-flip requires 20 moves.
Furthermore, intuition / statistics / http://cubezzz.homelinux.org/drupal/?q=node/view/63 all suggest that 20 will actually be the number, but no prove.
cubeobsession
Member
When I bought my latest Rubik's Cube, it came with a Solutions Hints Booklet. On page 21 of that booklet it says:
"RUBIKfact: Theoretically the shortest path to solving Rubik's Cube from any unscrambled position is as few as 22 twists. So far no one has succeeded in demonstrating this method".
"RUBIKfact: Theoretically the shortest path to solving Rubik's Cube from any unscrambled position is as few as 22 twists. So far no one has succeeded in demonstrating this method".
AvGalen
Premium Member
Yeah, I also read that part of the booklet. It says RUBIKfact, but there is no prove there or anywhere else.
On the link you provide it still references Morwen Thistlethwaites 4 fase 52/50 moves prove: "The least number of moves required in unscrambling the Cube from the worst disorder, the shortest route, is often called God's Algorithm. Morwen Thistlethwaite, using computers at South Bank University in London, calculated that the magical minimum was 52 moves. A number subsequently reduced to 50. It is thought that the number of moves may turn out to be somewhere in the low twenties."
And it is indeed an outdated source:
"The World RUBIK Cube championship was held in Budapest on June 5, 1982. Nineteen National Champions took part. Minh Thai, the US Champion, won by solving the Cube in of 22.95 seconds. The world record, in competitive conditions, grew progressively lower and now stands at 16.5 seconds."
A lot of these "proves" circle around on the internet. I even read a complex mathomatical study that came up with the formula (order - 1) * 10. Obviously it is correct for a 1x1x1 cube ((1-1)*10=0), but it fails for the 2x2x2 ((2-1)*10=10) that has been bruteforced at 11 (http://www.geocities.com/jaapsch/puzzles/cube2.htm#numpos)
On the link you provide it still references Morwen Thistlethwaites 4 fase 52/50 moves prove: "The least number of moves required in unscrambling the Cube from the worst disorder, the shortest route, is often called God's Algorithm. Morwen Thistlethwaite, using computers at South Bank University in London, calculated that the magical minimum was 52 moves. A number subsequently reduced to 50. It is thought that the number of moves may turn out to be somewhere in the low twenties."
And it is indeed an outdated source:
"The World RUBIK Cube championship was held in Budapest on June 5, 1982. Nineteen National Champions took part. Minh Thai, the US Champion, won by solving the Cube in of 22.95 seconds. The world record, in competitive conditions, grew progressively lower and now stands at 16.5 seconds."
A lot of these "proves" circle around on the internet. I even read a complex mathomatical study that came up with the formula (order - 1) * 10. Obviously it is correct for a 1x1x1 cube ((1-1)*10=0), but it fails for the 2x2x2 ((2-1)*10=10) that has been bruteforced at 11 (http://www.geocities.com/jaapsch/puzzles/cube2.htm#numpos)
MasterofRubix
Regular
It's amazing how much math is involved with the rubik's cube.
cubeobsession
Member
I've just added a links page to my website. It lists some sites that I have found very useful and interesting.
Rubik's Cube Links
Rubik's Cube Links
tenderchkn
Regular
- Joined
- Aug 11, 2006
- Messages
- 174
Sure, but most of it is irrelevant. The only useful application of math is understanding commutators, which leads to an intuitive understanding of algorithms, which leads to better recognition, which leads to faster solving...and so on.
AvGalen
Premium Member
Agreed about the math. I think it is amazing that after 25/30 years we still don't know the "maximum amount of minimum moves".
However without math, we wouldn't have these brute force programs that gave us so many wonderfull algorithms.
However without math, we wouldn't have these brute force programs that gave us so many wonderfull algorithms.
cubeobsession
Member
Looks good.
