there is already a forum for this https://www.chess.com/forum/view/more-puzzles/the-password-game-best-move-in-algebraic-chess-notation
Your password must include the best move in algebraic chess notation.

A few helpful pointers:
- The positions they give you are always checkmate in 2 for the player whose turn it is to move.
- The correct move is pretty much always a check that sacrifices a piece and/or captures one. As far as I'm concerned, there's only one puzzle where this is not the case.
- Don't forget the "x" for captures and "+" for checks. You may have had the right move, but skipped past it because you typed it wrong.
- The given positions will start repeating after a while, so make sure to memorize them for future attempts.
Your password must include the best move in algebraic chess notation.