3x3 COLL U 1 algorithm

Solve the last-layer corners with the last-layer edges already oriented; edge permutation may remain.

U 1 belongs to the U group in COLL.

Recognize this starting position

In the inverse-derived training position, the upper-face color points upward at these corner positions: UFR, UFL. 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: F F; R: R B; B: U U; L: B L. The letters identify colors by their reference faces.

Execute the algorithm

R' U' R U' R' U2 R2 U R' U R U2 R'

The opening is R' U' R; the final segment is R U2 R'. This version contains 13 face, wide, or slice turns and no whole-puzzle rotations.