I am not sure that I found the designed solution. I simply tossed one of the Rs from the inner “circle” onto the win block.
@GFJ ah bummer. Spoiler you are supposed to bring B closer ring by ring while avoiding the bots. No bots should be used to win.
I managed to get one of the reds to go to the win, , but when I tried to get B there it was very long winded and the reds kept getting stuck in the slider holes, . I didn't have the patience to keep trying.