Promotion generally happens when there are very few pieces on the board, and often the opponent's king is the only piece they can move, and it often is close to

Promotion generally happens when there are very few pieces on the board, and often the opponent's king is the only piece they can move, and it often is close to the promotion square since it was likely trying to block it. If the promoting piece can't check but immediately blocks the last movement squares for that king, as a queen may easily accidentally do, the player who has only the king gets a stalemate draw out of a technically lost position.