Managed to bring R to the plattform right next to the win, no idea how to lift it without sacrificing B...
I crushed B and B made it to the win but I cannot reproduce the path. I also do not see a logical solution.
@R 'oland I am not sure that I have found the most efficient and designed solution but I can disclose how I have solved the puzzle. It is a bit tricky. Spoiler: Crucial step The most crucial step is crushing B. Make sure that B remains in horizontal position and, then, carefully wriggle B out of the narrow space. After he is free and on his feet again, B is a bit wobbly. When you direct B to the win, his head will hit the red dot.
Hard to rate...Strange feelings and I'm sure that my way was a tricky shortcut...Thanks for sharing @Aris Yn