I would have looked at 11.e4, here.

The problem with this move was similar to the early Nc3 before advancing the c pawn. It blocks the center. As the e pawn is a center pawn which is important. For that reason, I would've played 11.e4 myself, as now, the center is controlled.

This really is too soon, as the pawn is unprotected. I would have given 12.Bd4 a hard look here, with the idea 12...Nc6 13.e4 Nxd4 14.cxd4 dxe4 15.fxe4 and the broad pawn centre once more. Gone would be the bishop pair, but the pawn centre remains in being. OK, Black would probably not be so cooperative, but White still would have come out with a reasonable position.

Thing to note here is that timing is critical. Even playing something only one move early or one move late can make a big difference, as kenneth_fiore_3, stressed in one of my annotations.

Not so easy a position to play, now...

...But this is quite a good move in the circumstances - the first thing I thought of, too. The bishop probably can't stay there long, but it does carry a threat: 14.Bxf6. If Black recaptures with the queen, White gets her pawn back with 15.Qxd5. Otherwise, Black gets pawns doubled on the K-side.

Black is preparing to smack the bishop by playing ...c5. As ...c5 can't be played immediately (13...c5?? 14.Bxc5), Black provides protection so that it can be played.

Which is why he played 13...b6, as ION noted a move earlier.

If you have to give the bishop up, make sure it is for something close to its value: a knight, say. 15.Bxf6 was indicated, on that principle alone. But there was more to it than the mere preservation of material parity. The idea is 15...Qxf6 16.Qxd5, winning a pawn back, or 15...gxf6 16.f4! when suddenly Black is faced with with two attackers (Q and B,) against his d-pawn, and it may not advance because 16...d4 17.Bxa8 - the pawn would be pinned against the rook, therefore! Nor can a second defender be found. So we find that 15.Bxf6 would have been a very strong move, winning a pawn whatever Black's response!

Couldn't have said it better.

The pawn should have stayed where it was. The problem for White is that, now a piece down, her position has deteriorated as well. It is very hard to find a decent move, now. 17.Qd3 possibly?

? The other thing is that, although it doesn't look so, this move is going to lose, yet, another pawn.

I would have taken with the knight, myself, keeping the Q-side pawns undoubled.

I would also recaptured with the Knight and for the same reason.

OK.

Wasting time on an unnecessary move. But Black can afford to waste time.

Even stronger was 18...Nb2 where the Queen is now attacked. So, white would be the one to lose time.

Better 20.Re2 and follow with 21.Rfe1, doubling rooks. But Black would probably have challenged such a plan by playing 20...Rfe8 before you could double the rooks.

?? The problem here is that it will cost you another R, and this time, for just a pawn.

White was in the game until her mistake on move 15 that cost a bishop for a pawn. She could have played 15,BxN (Bxf6), which not only would have been an 'equal' exchange, but it would have been a very strong move anyhow. A piece down, with a broken position, it was hard after that to come up with any worthwhile counter-play.

Yes, everything, however, was good, until that point.