In Vladislav777NEW777's puzzle after 5... Rg8 I believe 6. Rxh7# is mate. Exchanging the rooks is incorrect, because after 7. Nxg8 Black plays 7... Bxh3 and has a pretty easy endgame because the material is equal but a knight and bishop are stronger than a rook and pawn, and Black also has 3 passed pawns on the queenside. Also, how did White get a third rook? I don't see how White could have promoted a pawn to get a third rook.