ELS R3
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Find the pair's shape as for F2L, then count the misoriented last-layer edges (a top edge whose top facet does not show the top colour).
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Algorithms (9)
R U B' R B R' U2 R'
My choice
8 HTM · 8 STM · 9 QTM
3-gen
rotationless
<U,R,B>
Cubemuch
R U x' U' R U R' x U2 R'
8 HTM · 8 STM · 9 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
R U x' U' R U x R' U2 R'
8 HTM · 8 STM · 9 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
y' B Rw U B' U' B Rw' U' B'
9 HTM · 9 STM · 9 QTM
3-gen
rotation
<U,R,B>
Cubemuch
R U2 R2 F R F' U' R U2 R'
10 HTM · 10 STM · 13 QTM
3-gen
rotationless
<U,R,F>
Cubemuch
R U x' U' R U x R2 U' R U' R'
10 HTM · 10 STM · 11 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
R U2 R' U' R y R U' R' y' U' R'
10 HTM · 10 STM · 11 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
R U2 R' y' U R' U' R y R U R'
10 HTM · 10 STM · 11 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
x Lw U' Lw' y U' Lw U' x' Lw' U Lw' U
10 HTM · 10 STM · 10 QTM
2-gen
rotation
<U,L>
Cubemuch
How this case is verified
The case is the source's setup (or, where it has none, another source algorithm reversed). Setup: R U2 x' R U' R' U x U' R'. Every algorithm above was run by our logic engine from that state and reaches "f2l-eo".