Round 12
Sub 8
ao5: 8.20
1. (5.85) L' B U' R B L R B
2. 11.15 L' B' R L R U' B'
3. 6.27 L R U' R' B U' L' R
4. 11.12 R L B' U' L B' L R B'
5. 6.78 U L' R U R' B' U R U
6. 8.50 U R' U B' U R U' L R
7. 7.25 U' R L' R B' U B' U
8. 6.90 B' U L' R U' L U' B'
9. (15.78) R B...
I recommend watching the 4x4 example solves module on cubeskills.com, and the videos in this playlist: https://www.youtube.com/playlist?list=PLI24ciRbl8BXS--dBZmQJv1aYOGFzOXkP . That should help you doing the substeps efficiënt.