Spoiler for I don't see mate in 1, so...Spoiler forSpoiler for why?
You are using a different notation. Other people here use algebraic notation, where columns are numbered "a" through "h" from left to right (on the White's side); and rows are numbered 1 through 8 from White's side to Black's. Your notation is called "descriptive". When you say qb8!!, it could be confused with algebraic Qb8. In descriptive notation correct designation of the move you suggest would be: Q-QB8?? (Queen to Queen's Bishop 8).