First posted September 3, 2008, before edits:
I had been practicing this for awhile -- solving a fully scrambled Rubik's Cube while blindfolded. I did it this morning. Technically I was not wearing a blindfold, but I did have my eyes closed the entire time I solved it. The following is the story I gave at the Blindfold Accompishment thread at Speedsolving.com :I just did my first 3x3 blindfold solve this morning! It is so cool to open your eyes to find out if the result was total chaos or perfection.
I spent time late last night trying to memorize it, noticed I was forgetting, so I finished memorizing in the morning. I wanted to be able to "recite" the data for each stage. I think I took maybe 1 hour memo total, and maybe 20 minutes to solve. (I had no concern about timers or clocks.)
The scramble was from the "Doug JTimer" version of JNetCube,
D R B' L' F D2 U L2 R' D' U2 L2 B2 L' D F2 L' B D2 R' B2 F2 D R' L2
with F=white and U=green. (That's default for JNetCube, but not WCA regulations.
Edit: I emailed Doug. He has fixed this for his June 1, 2008 version.)
When I solve cubes, I have F=orange, U=yellow. My cube opposites are colored r/o, w/y, b/g and the r,w,b corner goes clockwise.
I used the 3 cycle method as described by Macky. I number corners as 1=ULB, 2=URB, 5=DLB, etc. I number edges as 1=UB, 2=UR, 5=BL, 9=BD.
[
[EDIT on Nov 23 2008: to clarify fully, for faces U (up), D (down), L (left), R (right), F (front), B (back) I number my corners as 1=ULB, 2=URB, 3=URF, 4=ULF, 5=DLB, 6=DRB, 7=DRF, 8=DLF. My edges are numbered 1=UB, 2=UR, 3=UF, 4=UL, 5=BL, 6=BR, 7=FR, 8=FL, 9=DB, 10=DR, 11=DF, 12=DL. I like to orient the cube with Yellow on U, White on D, Orange on F, Red on B, Green on L, Blue on R. Note my numbering system for edges is bad because "1" is likely to be cycled more than most cubies. Macky's system of 1=UF is better because it allow the 3-cycle (R U' R U R U R U' R' U' R2) to be done without a setup move such as U2.]] This is my memo, as I recall now...
Corner orientation: BAAC ABAB (where A=anticw, B=okay, C=cw)
Edge orientation: 5A6 (hexadecimal for 0101 1010 0110, where 1 means flip)
Corner cycles: (1),(2),(3),(4,8,5,7),(6)
Edge cycles: (1,3,7,11,10,12,6),(2,4,9,8),(5)
Yeah, the corner cycles aren't too bad, but the parity makes it tough.
Edit on Sep 3 2008: just double checked after my post to see if I recalled my memo correctly. Yes, I did! At the end I had to swap corners (4,7) and edges (2,8). I couldn't think of an easy way to set them up for an easy PLL. Then I realized I could swap edges (2,8),(1,3) and then setup for a T permutation, do it, and unsetup.
I couldn't believe it when I opened my eyes!