How would any of you guys know if this is the hardest chess puzzle?
the hardest chess puzzle, if you can solve, you are....genius!!!!

Find the checkmate and tactical sequence that I wanted to play had my opponent in me v o_biennis game played the correct retreating move Qc1. This position starts from move 20 in my game.
puzzle #3 can't the end pawn move? move h2 to h4 and promote to queen or rook, then take bishop. checkmate