Puzzle 19395

lichess.org/training/19395

What about this Line?

1- Qh5+ --- Kg8
2- Qxg6+ --- Bg7
3- Qh7+ --- Kf7
4- Qh5+ --- Kg8
5- Bh7+ --- Kh8
6- Bg6+ --- Kg8
7- Qh7#

Because 6. Bg6+ Bh6 . mat in 8 move , main line - mat in 7

Try playing the puzzle position versus AI level 8 to validate your line. Use the swords icon under the puzzle board.