I6+
PLL
I - 2x1
Look for blocks (pairs and lines of matching stickers) on the sides; their kind and position name the group.
Your status
Algorithms (2)
U' R U2' R2 U2' R' U2' R U' R2' U' R' U' R U' R' U' R2 U R2'
My choice
20 HTM · 20 STM · 27 QTM
2-gen
rotationless
<U,R>
LowCubes
(U') y2' F R U2 R' U' R U' R' F' U R' U' R U2' R' U R U R' U R
21 HTM · 21 STM · 23 QTM
3-gen
rotation
<U,R,F>
Do U' first (AUF) on the case as drawn. · LowCubes
How this case is verified
The case is the source's setup (or, where it has none, another source algorithm reversed). Setup: R2 U' R2' U R U R' U R U R2 U R' U2 R U2 R2' U2 R' U. Every algorithm above was run by our logic engine from that state and reaches "pll-solved", keeping first-layers and oll-solved.