No clue? B appears to be stuck and since there are no stairs, the R's will not stack so I can't see a win and therefore can't make anything happen.
@Mr. Emmas - Have you noticed a lack of feedback on your levels? You are making your levels so hard and/or out of reach that we can't even start the level. That's fine if you want to give some players a challenge but if they are winning your levels they are not saying so. My guess is most players are just like me, have no clue what you want nor how to do it.