ELS R4
ZBLS
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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).
Your status
Algorithms (5)
R B' R B R2
My choice
5 HTM · 5 STM · 6 QTM
2-gen
rotationless
<R,B>
Cubemuch
x' R U' R U R2 x
5 HTM · 5 STM · 6 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
R U R2 F R F'
6 HTM · 6 STM · 7 QTM
3-gen
rotationless
<U,R,F>
Cubemuch
R U x R2 U R U'
6 HTM · 6 STM · 7 QTM
2-gen
rotation
oh
<U,R>
Cubemuch
(U) first, then:
y' Lw y U2 Lw y' Lw U' Lw U'
7 HTM · 7 STM · 8 QTM
2-gen
rotation
<U,L>
Do U first (AUF) on the case as drawn. · Cubemuch
How this case is verified
The case is the source's setup (or, where it has none, another source algorithm reversed). Setup: x' R2 U' R' U R' x. Every algorithm above was run by our logic engine from that state and reaches "f2l-eo".