https://lichess.org/FiJKb8wzTcA5
https://lichess.org/FiJKb8wzTcA5
White has enough material to mate under FIDE laws of chess. Rule says if there is ANY sequence of moves (how ever silly moves that is) it enough material to win the game. Here black can get stuck in corner use the promoted piece to take on escape square and the knight can deliver mate