Not the best move. Instead, 2.Nf3 was stronger. But, in general, with the Queen Pawn Openings, the c pawn should be advanced before you develop that Knight.

Richter's Opening. Quite OK.

The same thing is true for black. The c pawn ought to have been advanced, first. It's a minor thing, but it can add up.

?! Moving the same Knight twice rather then developing. However, black can do a little damage here.

Better was 3.e3 or Nf3.

Yes, and it develops. But, you could have deviated here, Erika. I would've attacked with 3...a6! which, immediately, gains a tempo. Now, white must retreat, with which, you can use the time to develop something. For example, the move that you played, and doing it a move later would've put you ahead in development and given you a space advantage since now, there would be a little more space in the center since you'd have more out.

White has a threat here. What is it?

?? Not the way to go. Best was 4...Rc8, but this move would exchange, but you it would still be level. Don't forget that white was threatening a winning attack. And, white can win here. How?

There were two defences against White's threat to play 5.Nxc7 Qxc7 (forced) 6.Bxc7. One was Joe's suggestion, 4...Rc8. A reasonable alternative was 4...e5.

?? This is not it and is a terrible blunder. The winning attack was 5.Nxc7+! Yes, it is an effective fork since black is in check. And, 5...Qxc7?? doesn't work because of your Bf4 which would win the Queen, in return. But, this move is now a blunder from white that ought to win a piece for a pawn. What should black do?

I can not understand why White passed up the win of the Queen by 5.Nxc7ch.

?? Best was 5...axb5 I can see that you wanted the pawn, but white can still fork and win a Rook for Knight.

And now, what was wrong with 5...axb5?

?? 6.Nxc7+ was still best. But, with this move, you're now going to get a piece. We have seen blunders from both sides, and it's only the beginning but a lot of missed opportunities.

I'm sorry, but I have to disagree with you here. As noted, both sides made a blunder that wasn't exploited until this move. But, white would have had the advantage earlier, had he forked and checked with Nxc7 and would be the exchange up.

Well, it has come right. But one can not rely on one's opponent's generosity!

? Best was 7.Bxb5, getting a pawn, in return. But, this gives you a free piece now.

Although it undevelops, it's, unfortunately, your only move. Anything else gives him back the Knight.

Na5 is far better.

This retreat will do. Beats losing it for a mere pawn, at any rate.

I don't like it, as well as, castling short. But, it was the only way to castle quickly since his other side isn't developed, yet.

! At least, this allows to redevelop your Nb8 later on, not to mention that the c pawn has advanced.

Capture with the knight was better as it develops.

Only thing to note is that your Bd7 is now pinned to your Queen. Not to worry because this is actually a half pin that can easily broken with ...Qc8 or ...Qc7. Also if you moved it now, you wouldn't lose anything since if he takes your Queen, you can simply recapture his Queen. The only asset would be your loss of castling rights.

? Not a great move, as this leaves his King vulnerable. Not only that, but it loses a pawn. Best was 10.Kb1.