Morphy v The French (part six)

ALTHOUGH it is not described as such in ChessBase's 2019 Mega database, Paul Morphy seems to have played this game blindfold.
His opponent is José María Sicre, a Cuban slave, and the game took place in Havana in 1862 (while the American Civil War was raging further north).
Morphy - Sicre
1.e4 e6 2.d4 d5 3.exd5 exd5 4.Nf3 Bd6 5.Bd3 Nf6 6.0-0 0-0 7.Nc3 c6
The same move as played by Löwenthal when he first tried the French against Morphy (see part two of this series).
8.Bg5 Bg4
Löwenthal played 8...h6. Sicre's choice is the main move today.
9.h3 Bxf3?!
But this casual surrender of the bishop-pair finds few followers in modern chess, although other famous names to have played it include Mason and Maróczy.
10.Qxf3 Nbd7 11.Rfe1 Qc7

Morphy to play, starting an interesting attack

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12.g4!?
Given enough time, this comes to be Stockfish10's choice, although Komodo9 remains unimpressed. I guess Morphy is arguing that Black, who is slightly behind in development (White has five pieces developed to Black's four, and it is White's move), is not well-placed to take advantage of the holes that will appear in White's kingside.
12...Rfe8 13.Be3
Avoiding exchanges and preparing to evict the black knight at f6.
13...Kh8?!
This loses a pawn ... or sets a cunning trap that Black fails to follow up properly. The engines suggest 13...g6, which at least protects the light squares, which could become vulnerable since White has the only light-square bishop.
14.g5 Ng8 15.Qxf7?!
Rushing the pawn-grab. It was probably better to continue building the attack with 15.Ne2 or 15.h4.
15...Re7?
But this is definitely a mistake. The engines point out 15...Ne5! 16.Qxc7 Nf3+ 17.Kh1 Bxc7 18.Rf1, when White is a pawn up and has the bishop-pair, but White's kingside weaknesses and problems coordinating his pieces mean Black has decent compensation.
16.Qh5
Withdrawing, but with a threat to mate.
16...Nf8 17.Qg4 Ne6 18.Bxh7!?
18.Ne2 was more prudent.
18...Nf6??
This loses in short order. Black had to try 18...Kxh7, when 19.Qh5+ Kh6 20.gxh6 g6 leaves Black's king relatively safe. Although White is two pawns up, the engines reckon he only has a slight edge, not least because it is now White, rather than Black, who is vulnerable on the light squares.
19.gxf6 gxf6 20.Bg6 (1-0, 27 moves)
To be concluded