@gmacpro ..autopilot. There is a definite technique for that move that is over 90% succes and i found that B’s angle of approach was very important.
@gmacpro No need of wedge auto pilot. Spoiler: solution 1.B go down to the floor, and go through under the end, wait R by staying on the stair; 2.R be stucked at downstairs under the 'window'; 3.B back to the position where B was at game-start time, by using two stairs and one stone（B between the stone and the waiting-stair;forth,back,forth again; 90% success）; 4.B enter into the 'window',then to the end.
@Mike_CN .. solution move number three sounds like a momentum move which is never very desirable . I think my autopilot is a cleaner solution. Spoiler: Autopilot
@Mike_CN What you describe is a "boogie bot", a highly counter-intuitive inertia trick generally avoided as part of a designed win path.
@Mike_CN - Step 3 is more of a luck move for me. I can BB downward normally but upwards is a different story as there's an extra tap to get up. The auto pilot on the wedge is way more stable even though it wasn't than the BB.
