After 11 book moves, as I have done in so many of these games, I resort to an early Knight retreat which misses the mark. I miscalculated the moves following 18.e5 Nb4 19.exd6 and now not ...Qxd6 20.Bxf5 but 19...Qc6 which is winning. Consequently I have to try something else. I have almost equal material, but Stockfish gives black a massive positional advantage which is easily demonstrated in a few moves.