**Scramble** (fmc.mustcube.net #310): U’ D2 L R’ F2 R B D’ F’ B2 U’ D’ F’ R2 L2 F U B’ D2 U’ B’ L F2 U R D’ B F R’ U’

**Solution:** L R2 F’ D’ F2 B2 R’ U L U’ R2 U L U B2 D B2 U F2 R2 U R2 U F2 U’ L2 (26 HTM)

**Explanation:**

*Pre-scramble:* L2

*1) getting into <U,D,L,R,F2,B2> group*

L R2 F’

*2) getting into <U,D,L2,R2,F2,B2> group*

* 2a) edges*

D’ F2 B2 R’

*2b) corners*

U L U’ R2 U L’

*3) domino-solve*

*2x2x2 block:* L2 U B2 D B2

*2x2x3 block:* U F2 U

*F2L minus 1 slot:* F2

*Solve all:* F2 U’ R2 U R2 U F2 U’

*Correction:* L2

**Comment:**

Guus Razoux Schultz said:

*Hi Okayama,*

* Very smart solve! How long did you need to find this?*

* Yes, this was a very hard scramble for 1-hour solve. I had a 35-move-backup-solve but I thought it wasn’t worth posting. Now I see the best 1-hour solve was 36 moves. What was your 1-hour solution?*

* With pre-moves U2 L2 you can find nice starts but all left rubbish, also for NISS!*

* Gus*

Tomoaki Okayama’s answer:

*Hi Guus,*

* Curious about the length of time? Maybe not only you. *

* I spent a long time actually, a few hours. Most of the times were spent on investigating the step 3).*

* So I don’t think this approach can be used in an official competition, at least for me.*

* In 1-hour solve of #310, I didn’t have any full solution (DNF).*

* Here are some of my tries:*

* 1st 2x2x1 block: F’ D2 F2 D2*

* 2nd 2x2x1 block: B2 L2 U2*

* Pseudo 2x2x3 block: L’ U R’*

* F2L minus 1 slot: F’ U’ F2 U F L’*

* Finish F2L L’ B L B’*

* Pair 3-cycle: L U L’ U’ L’ B L B’*

* first try, almost linear solve, which leaves 3 corners with 27 HTM.*

* I should complete this skeleton as a backup solution. *

* Another interesting start for the inverse scramble:*

* 2x2x2 block: L’ U2 D2 R’ L’ D*

* 2x2x3 block: U2 F U2 R2*

* F2L minus 1 slot: L’ U L U2*

* I couldn’t find a good continuation in 1-hour. But just now, I found the following continuation:*

* All but 3 corners: U2 F’ U F’ U2 F U F’ U F2 U2*

* Not special, 23-moves skeleton. I hope I could find this skeleton in 1-hour…*

Original post; comment taken from here and here.