ELS F1
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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 (7)
R U2 R' U F' U' F
My choice
7 HTM · 7 STM · 8 QTM
3-gen
rotationless
<U,R,F>
Cubemuch
R U2 R' y' U R' U' R
7 HTM · 7 STM · 8 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
R U x' U' R U x R' U R'
8 HTM · 8 STM · 8 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
y' B Rw U B' U' B Rw' U2 B'
9 HTM · 9 STM · 10 QTM
3-gen
rotation
<U,R,B>
Cubemuch
(U) first, then:
R U2 R' y2 U x' U' R U' R' U2
9 HTM · 9 STM · 11 QTM
2-gen
rotation
oh
<U,R>
Do U first (AUF) on the case as drawn. · Cubemuch
(U2) first, then:
y L U2 x' L2 U L' U' x L' U2 L'
9 HTM · 9 STM · 12 QTM
2-gen
rotation
<U,L>
Do U2 first (AUF) on the case as drawn. · Cubemuch
R U2 R' y2 R y U R' U' R y' R'
9 HTM · 9 STM · 10 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
How this case is verified
The case is the source's setup (or, where it has none, another source algorithm reversed). Setup: R' U R U' y R U2 R'. Every algorithm above was run by our logic engine from that state and reaches "f2l-eo".