3x3 · COLL
3x3 COLL L 1 algorithm
3x3 COLL L 1 algorithm: 15 turns, opening with y' R U. Case recognition, the complete sequence, and practical execution notes.
Solve the last-layer corners with the last-layer edges already oriented; edge permutation may remain.
L 1 belongs to the L group in COLL.
Recognize this starting position
In the inverse-derived training position, the upper-face color points upward at these corner positions: UFL, UBR. Upper edges with that color facing up: UF, UL, UB, UR. Reading each side’s upper corner stickers left to right when facing that side gives F: B L; R: U L; B: F U; L: F R. The letters identify colors by their reference faces.
Execute the algorithm
y' R U R' U R U' R' U R U' R' U R U2 R'
The opening is y' R U; the final segment is R U2 R'. This version contains 15 face, wide, or slice turns and 1 whole-puzzle rotation.