ELS F4
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 (2)
F' Rw U' Rw' F2
My choice
5 HTM · 5 STM · 6 QTM
3-gen
rotationless
<U,R,F>
Cubemuch
x U' L U' L' U2
5 HTM · 5 STM · 6 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: U2 L U L' U x'. Every algorithm above was run by our logic engine from that state and reaches "f2l-eo".