From fmc.mustcube.net round #423, no time limit

**Scramble:** L B’ F D’ R U’ R2 B D’ U’ B U D2 L2 D2 L’ D L B2 F D U2 L2 R2 B D’ L2 D2 U2 L

**Solution 1:** U2 R U2 L2 F’ U’ F’ U F R2 L’ U2 D F U2 F’ D’ F U’ F’ L F’ L B’ L F L’ B U’ (29 HTM)

**Explanation:**

*Premove:* U’

U2 R U2 *//2x2x1 + pair (3/3)*

L2 F’ U’ F’ U F R2 //Pseudo F2L-1, found premove U’ (7/10)

L’ U2 F * U F’ //EO + 2 pairs (5/15)

L F’ L B’ L F L’ B //All but 3 corners (8/23)

U’ //Undo premove (1/24)

* = F’ D F U2 F’ D’ F U2 //3 corners, 3 moves cancel (5/29)

**Comment:**

An example of Heise-style skeleton, continuing with EO right after the F2L-1 step.

**Solution 2:** U2 R U R U L2 U’ R’ U F’ U’ F’ U F R2 L2 B L2 B L’ F’ L B2 L’ F L2 B’ U B U (30 HTM)

**Explanation:**

U2 R U2 * L2 F’ U’ F’ U F R2 //Pseudo F2L-1, same as before (10/10)

L2 B L2 B’ + L B’ U B U //All but 5 corners(9/19)

* = U’ R U L2 U’ R’ U L2* //3 corners, 3 moves cancel (5/24)*

+ = B2 L’ F’ L B2 L’ F L *//3 corners, 2 moves cancel (6/30)*

**Comment:**

Same start as before, but this time I continued differently, and left 5 corners (2 3-cycle insertions needed) instead of 3. Before finding the the insertions, there was no way to determine which skeleton was better.

**Solution 3: **U2 D R U R’ D’ R U2 L2 U’ R’ L F L’ F’ L’ R’ B2 D’ B’ D B’ L2 B L B’ U2 (27 HTM)

**Explanation:** (with the NISS notation explained here)

U2 R U’ L U’ //2x2x1 + 3 Pairs (5/5)

(U2) //3x2x1 (1/6)

(B L’ B’ L2 B D’ B D B2 R2) //All but 3 edges and 3 corners (10/16)

*Final Skeleton (on normal scramble):*

U2 R * U’ L U’ + R2 B2 D’ B’ D B’ L2 B L B’ U2

* = R’ D R U R’ D’ R U’ //3 corners, 3 moves cancel (5/21)

+ = U L U’ R’ L F L’ F’ L’ R //3 edges, 4 moves cancel (6/27)

**Comment:**

Here I decided to go for a slightly different beginning and switch to inverse scramble (Using NISS); the skeleton is interesting because it’s different from the standard Blocks->F2L-1->All but a few pieces.