Which is what I would've done because white is about to be forced to liquidate while behind which favors you.

Of course, white has less to work with.

At least, it redevelops.

? This is going to cost him another pawn. Just about anything was better then the move played. I would've responded with 14.Bg2 to attack e4.

Now, black is clearly winning because you have the solid pawn chain. As now, you're threatening to promote here. Don't forget that two pawns together are quite dangerous.

?? This loses. do you see why?

id=lake-bay has a point, but the game was already lost before this move since black blundered a piece. In fact, it was more clear to me once black played 15...cxd5. Of course, it's not easy to win since chess is a complicated game, but things are definitely easier for black and reckon that she's not far off from winning.

Correct was Bxg4!! Black cannot recapture because of the followup Qxd2+ winning.

On the other hand, it wouldn't have made that much difference had black played 16...Bxg4 It's good but not worthy of !!. It's more like !, except that I don't mark it with anything. It makes the win a little easier just because black has another pawn, but that's it. I don't see a main continuation. However, a more powerful move for black has already been played earlier, and the fact that c4 and b5 are connected does give black a win, if she finds the right continuation.

I think Bxg4 is pretty strong. Even if white chooses not to capture then the attack grows. 16...Bg4 17. f3 Qd4+ 18. Kc2 exf3 (preparing Bf5+) 19. Nxe3 Bf5+ 20. Bd3 Bxd3+ 21. Kc1 Qa1# That would be an interesting position in that none of the black kingside pieces have been developed.

This is correct.

And, now, you have a really good move that wins here. How should black proceed?

Better Bg7+

Absolutely not, Erika. ...Bg7+ is decent. But, best, however, was 18...b4! Yes, this is what I was also implying earlier. As that allows 19...c3! which wins for black. It's not immediate, but black will, eventually, promote. This, move, however, loses a passed pawn.

18...b4 is not so good. 18...Bg7+ is stronger - why not bring another piece to the attack but actually 18...c3+ is very interesting, particularly if white captures it as happened here.

19...Bg7+ is now very interesting. White has three options 20. Kd2 Bxg4+ wins the queen 20. Kb3 Be6+ 21. Kc2 Bb3+ 22. Kxb3 Qxd1+ also wins the queen. 20. Kc2 is a bit harder but Nb4+ 21. Kc1 Na2+ 22. Kc2 (if Kb1 Qa5) b4 (planning Ba4+) and if 22.Kb1 then Nc3+ wins the queen.

?? Best was 20.Be2 This defends the pawn but is going to lose a piece, starting with Erika's next move. And, what's good is that black finds it right away.

?? I can see why you played it, since it forks. But, it's ineffective. Instead of winning another piece, this move ought to hand white back a piece and, for the most part, compensate for lost material. How?