Annotated chess game

It's threatening to attack the knight - but the knight just runs away. So your threat isn't very threatening. Instead, you have three pieces at home doing nothing - bishop, queen and a rook. You're a queen up here (well, for a piece), but that will only count if you get all your pieces into the game. And you won't do that while making non-threatening pawn moves.

Alas, no. White defends this threat very easily - and black achieves nothing other. Maybe you could argue it's good to get rid of the bishop from e6 - but white can kick the knight with a3 and bring the bishop back in. Instead, as you say, Qd6 looks good - developing a piece with an attack. The knight also moves with attack - but it's already developed. As a basic rule, you need to get all your pieces into the game before starting a real attack.

This move is nearly pointless. As cdeburca says, this is very easy to defend, so you gain nothing.

Qd6 like cdeburca said is best

e6 has been a bane for black! But why is this the case? Look back to black's unusual first move - 1. ... f5. With the pawn on f7, neither the bishop nor the knight could have landed on e6.

This is a good move as it keeps the bishop out of f4 for starters.

Both rooks are still forked - why rush to take? Development is better.

cdeburca is right again, no need to rush for white the threat will still be there.

king takes would not help because the Q would wind up pinned to the K on d-file

This is a blunder as black's knight is now undefended - 20. B(b)xN wins a piece, while B(g)xN wins an exchange.

d5 is the object