** Scramble:** D L2 D’ R2 B2 D’ U’ B2 L’ F’ R D’ U’ F2 U B F’ L2 B2 U2

**Solution:** L2 U2 D B U2 B’ D2 B U2 L R’ D2 F R F’ U F U2 R U F R2 F2 D’ B’ (25 HTM)

**Explanation / Comment:**

*I chose* [B’] *as pre-scramble move on the normal scramble. Why? I Explain later.*

*2x2x2 block:* U2 D’ B L

*not happy with continuation so I searched for inserted moves, possibilities: L, L2 and L’ before first move. L2 worked out best:*

* so: 2x2x2 block:* L2 U2 D’ B L* (5+1)*

*pseudo 2x2x3:* R’ D2* (7+1)*

*undo pseudoness with extra pre-move* D’* (7+2)*

*So premoves* [D’ B’]* F2L-1:* F R2 *(9+2)*

*switch to the inverse scramble with this start as pre-moves:* [R2 F’ D2 R L’ B’ D U2 L2]

*F2L-1:* B D *(2+9)*

*many possibilities to finish f2l, I chose for most cancellations on next step (ELL)*

*F2L:* F2 R2 F’ R2 F R *(8+9)*

*ELL:* R’ F’ R2 U’ R’ U2 F’ U’ F R *(12+9) — 6 moved cancelled!*

*again one move cancelled with pre-move correction which gave the following edge frame with 3 corners left:*

B D F2 R2 F’ U’ R’ U2 F’ U F R R2 F’ D2 R L’@ B’ D U2 L2 *(20)*

* at @ insert U2 B’ D2 B U2 B’ D2 B, 3 moves cancel*

* inverting the solve gives the solution above*

*Why did I choose* B’ *as pre-move in the beginning? Let me explain.*

* – 3 moves make a pair on the regular scramble ( *U’, R2 *and* L’*)*

*- 5 moves make a pair on the invere scramble (* U, R, R2, L, *and* B*)*

Because each “pairing-move” can also be used a pre-scramble-move, there are 16 ways to start with a 1-move-pair.

*These are simple too much possibilities to investigate, so I had to pick only a few of them.*

* Then I had a look at number of the bad pairs after the scramble. Bad pairs are adjacent corner-edge pairs that are wrongly paired up. This scramble had 6 bad pairs. Which is about average.*

* I chose *B* on the inverse scramble and* B’ *as pre-move on the inverse scramble because this move unlocked 2 bad pairs while all other pairing-moves did not unlock any bad pair. *

* This tactic is based on the assumption that less bad pairs in a scramble are possibly easier too solve, at least easier to find a good block build. *

* I cannot prove this, purely intuitive assumption.*

*Since three months or so I use this trick to prevent getting lost in too many, good or bad, possible starting moves.*

* And this time it worked out very well.*

* Happy with this, a PB-2, I never did so many tricks in a competition solve. *