Promotion | Puzzle of the day 07/01/2023

How does White get the promotion?

Rc8 Rxc8 a7 Kxa7 bxc8=Q

@ninjaswat ? I believe you made some mistake....rc8 rxc8 a7 kxa7 where is bishop TAKES C8 IF BISHOP IS ON D5!? And still no promotion.

bxc8 means pawn on b file takes on c8, where the rook is. This is a promotion since the pawn is reaching the 8th rank.