ELS R1
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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 (11)
L R F U F' U' R' L'
My choice
8 HTM · 8 STM · 8 QTM
rotationless
<U,R,F,L>
Cubemuch
F' U L' U L U L' U L F
10 HTM · 10 STM · 10 QTM
3-gen
rotationless
<U,F,L>
Cubemuch
R' D' R U' R' D F R F'
9 HTM · 9 STM · 9 QTM
rotationless
<U,R,F,D>
Cubemuch
R U2 R' U x' R U' R U R2
9 HTM · 9 STM · 11 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
(U') first, then:
R' F R F' R U R' U2 R U R'
11 HTM · 11 STM · 12 QTM
3-gen
rotationless
<U,R,F>
Do U' first (AUF) on the case as drawn. · Cubemuch
y2 Rw' B' Rw U' Rw' B U Rw B'
9 HTM · 9 STM · 9 QTM
3-gen
rotation
<U,R,B>
Cubemuch
(U') first, then:
Lw' y Lw' y Lw' U Lw U Lw' U' Lw
9 HTM · 9 STM · 9 QTM
2-gen
rotation
<U,L>
Do U' first (AUF) on the case as drawn. · Cubemuch
x U2 L U L' y' U L U' L2 U
9 HTM · 9 STM · 11 QTM
2-gen
rotation
<U,L>
Cubemuch
y' R2 F R F' R U2 R' U R
9 HTM · 9 STM · 11 QTM
3-gen
rotation
<U,R,F>
Cubemuch
x U2 L U L' y' U L2 U' L U
9 HTM · 9 STM · 11 QTM
2-gen
rotation
<U,L>
Cubemuch
R y2 R y R U R' y U' R' y2 R'
8 HTM · 8 STM · 8 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: F' L' U' L U' L' U' L U' F. Every algorithm above was run by our logic engine from that state and reaches "f2l-eo".