OS1
Notation
Last bottom triple
LBT / One solved
Match the case drawing, including the side colours and the pieces already solved; hold the puzzle as drawn.
Your status
Algorithms (3)
(R') first, then:
R' B U' BR U BR' B'
My choice
7 HTM · 7 STM · 7 QTM
rotationless
<BR,U,R,B>
Do R' first on the case as drawn. · Cubemuch
(R') first, then:
Lt L BL L' R' L BL' L' R Lt'
8 HTM · 8 STM · 8 QTM
3-gen
rotation
<BL,R,L>
Do R' first on the case as drawn. · Cubemuch
(R') first, then:
R' Lt R' L BL L' R L BL' L' Lt'
9 HTM · 9 STM · 9 QTM
3-gen
rotation
<BL,R,L>
Do R' first on the case as drawn. · Cubemuch
How this case is verified
The source's tracked-sticker identities define this case; its setup is reconstructed and checked against them. Setup: Ro Lt R' L BL L' R L BL' L' Lt' R. Every algorithm above was run by our logic engine from that state and reaches "lbt-solved".