No trick but you used hidden Okay - I got it but white space is hard to deal with as there is no reference. Spoiler: Photo
@casper - Looking at my photo, B and R are on the white space. R needs to go on the white space and guided back in order to win, right?
@casper - Are you saying R doesn't need to go onto the white space in order to win? Maybe I didn't do it as intended.