Three flipped 21
OLL parity (3 flips)
Count the flipped dedges (three here), then read the corner shape.
Your status
Algorithms (3)
Rw U2 x Rw U2 Rw U2 Rw' U2 Lw U2 Rw' U2 Rw U2 Rw'
U2 Rw' U' 3Lw' U' 3Lw L' U' L U 3Lw' U 3Lw
My choice
28 HTM · 28 STM · 36 QTM
3-gen
rotation
<U,R,L>
One hand: needs L, B, S or E
Cubemuch
y2 R' D 2D 3D R' R 2R U2 2R' R' U2 R 2R B2 R
2R R 2R U2 2R' R' U2 R 2R U2 B2 R 2R R 2R B2
R 3D' 2D' D' R
49 HTM · 36 STM · 57 QTM
rotation
<U,R,D,B>
One hand: needs L, B, S or E
Cubemuch
L' D 2D 3D L' R 2R R 2R B2 U2 L 2L U2 2R' R'
U2 R 2R U2 F2 R 2R F2 2L' L' B2 R 2R R 2R L
3D' 2D' D' L
49 HTM · 36 STM · 57 QTM
rotationless
<U,R,F,D,L,B>
One hand: needs L, B, S or E
Cubemuch
How this case is verified
The case is the source's setup (or, where it has none, another source algorithm reversed). Setup: R' D 2D 3D R' B2 2R' R' 2R' R' B2 U2 2R' R' U2 R 2R U2 2R' R' 2R' R' B2 2R' R' U2 R 2R U2 2R' R' R 3D' 2D' D' R y2. Every algorithm above was run by our logic engine from that state and reaches "oll-solved", keeping first-layers.