B can win. Found two ways to finish and maybe a third but I wasn’t able to knock B off the Rdraggable with the ball alone.
Found yet another B win. Would anyone like to explain how the win has been triggered here? The draggable does not trigger the win if B is not ontop, and even with B on top , a slow approach won’t trigger the win. Spoiler: Strange win
Again many red herrings or I found a shortcut. B doesn't need to move - Push the ball with the slider, onto the slider with R attached and move ball to the win.
I did that too. I can't see another way. Just going to look at the video by @ridgerunner to see that in action.