UB
Corner comms
U first
From memo: the pair's letters are the case. The diagram shows the buffer and both targets lettered, the rest greyed.
Your status
Algorithms (4)
R F' D R' U' R D' R' U R F R'
My choice
12 HTM · 12 STM · 12 QTM
rotationless
<U,R,F,D>
One hand: R, U and M with F and D
BLDDB, on 36 solvers' sheets
x' R U R' D2 R U' R' D2 x
8 HTM · 8 STM · 10 QTM
3-gen
rotation
<U,R,D>
One hand: R, U and M with F or D
BLDDB, on 21 solvers' sheets
R' U R' D' R U' R' D2 R U R' D' R U' R
15 HTM · 15 STM · 16 QTM
3-gen
rotationless
<U,R,D>
One hand: R, U and M with F or D
BLDDB, on 3 solvers' sheets
U R' U' R F2 R' U R U' F2
10 HTM · 10 STM · 12 QTM
3-gen
rotationless
<U,R,F>
One hand: R, U and M with F or D
BLDDB, on 2 solvers' sheets
How this case is verified
The case is the source's setup (or, where it has none, another source algorithm reversed). Setup: x' D2 R U R' D2 R U' R' x. Every algorithm above was run by our logic engine from that state and reaches "solved".