	[x] Posted via EE Mobile
	Search, ask, and monitor your questions on the go with EE Mobile. Visit Experts Exchange from your mobile device and never be out of touch again.

06/09/2009 at 08:49AM PDT, ID: 24476160

	[x] Attachment Details

[x]

The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

The Grade of the Solution
The Zone Rank of the Expert Providing the Solution
The Number of Author and Expert Comments
The Number of Experts Contributing
The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

8.6

Quickest Rubik's cube sequence

Asked by InteractiveMind in Puzzles & Riddles, Puzzle Games, Math & Science

We'll use the notation:

U up face (top)
D down face (bottom)
L left face
R right face
F front face
B back face.

Then an edge cube is denoted by two faces, e.g. UL. And a corner cube by three, e.g. RFU.
To rotate the left face 90 degrees CW, we'll denote it L+, and CCW, L-, or 180 degrees (either way) L2.

The problem:

Imagine a complete cube but with DF, DR, DB, DL oriented incorrectly (see attached image).
What is the quickest way to complete the cube from here?

So far I've managed to do it in 64 moves*. I tried an online solver, but the best it could do was 84 moves.
Points are available for: i) a quicker solution, ii) proof/evidence that a quicker solution even exists, iii) proof/evidence that this is the quickest solution, iv) a number for the absolute minimum possible number of sequences.

* The winning sequence so far (the spacing reveals a slight repetitive pattern):

R+ L- F+ L+ R- D+ R+ L- F+ L+ R- D+ R+ L- F2 L+ R- D+ R+ L- F+ L+ R- D+ R+ L- F+ L+ R- D2
B+ F- R+ F+ B- D+ B+ F- R+ F+ B- D+ B+ F- R2 F+ B- D+ B+ F- R+ F+ B- D+ B+ F- R+ F+ B- D2

View the Solution FREE for 30 Days

20091028-EE-VQP-85 - Hierarchy / EE_QW_EXPERT_20070906

1. ozo 18,298
2. harfang 10,400
3. Infinity08 6,992
4. NovaDeni... 4,100
5. Paranorm... 3,888
6. WaterStreet 3,620
7. d-glitch 3,550
8. Interactive... 3,000
9. RobinD 2,926
10. a_b 2,800
11. thehagman 2,700
12. Rogiee 2,695
13. MASQUE... 2,400
14. Xxavier 2,340
15. nickg5 2,200
16. BigRat 2,020
17. dhsindy 2,000
17. folderol 2,000
17. bingie 2,000
17. sunnycoder 2,000
17. Admin3k 2,000
17. DanielWilson 2,000
17. sinoj 2,000
17. Bleoboris 2,000
17. tapanpatt... 2,000
17. FDMilwau... 2,000
17. climbgunks 2,000
17. ziper 2,000
17. BartoszJa... 2,000

1. ozo 337,896
2. Infinity08 101,079
3. sunnycoder 100,229
4. andyalder 51,486
5. RobinD 37,251
6. Arawn 35,790
7. mgh_mgh... 35,137
8. snoyes_jw 32,173
9. MASQUE... 30,525
10. asyscokid 25,315
11. harfang 22,250
12. angelIII 22,137
13. andycrofts 20,711
14. MusicMan 19,918
15. maramom 19,132
16. Wwysdom 18,940
17. JohnK813 18,516
18. TName 15,502
19. sirbounty 14,960
20. Galisteo8 14,310
21. pkwan 13,840
22. Xxavier 13,315
23. SunBow 13,270
24. NovaDeni... 12,135
25. peter57r 11,772

Quickest Rubik's cube sequence

Asked by InteractiveMind in Puzzles & Riddles, Puzzle Games, Math & Science

About this solution