thank you so much
The Password Game - Best Move in Algebraic Chess Notation.

I need help Rule 16

white to move
Qb5+ is the solution. Because after axb5 (only move for black) axb5 by white is mate.

i need help
This is a nice one. The solution is the crazy looking move Nxd7+ , sacrificing the queen. Black now has a lot of moves, though all lead to mate in one for white. So let's say black plays Nxe2 , then Nf6 (double check!) is mate.
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please help im stuck
The move is Rxg7+. The only move now for black is Rxg7. White now plays Nf6#.