Hindsight

Same position. I'm trying to map some invisible structures, in order to get more insight in the preconditions for an attack.

Diagram 1. BLACK to move

 

rnb2rk1/1pq1bppp/p2ppn2/8/3NPPP1/2N1B3/PPP1B2P/R2Q1RK1 b - g3 0 10

The arrows in diagram 1 show the most important LoAs along which the battle was fought. 

• Nf6 was harassed by pawn g5
• BLUE The g-file was cleared from the white king and g-pawn.
• BLUE the first rank was cleared from the Queen and rook f1
• YELLOW the f-file was cleared from the f-pawn
• GREEN the diagonal was cleared from the f-pawn

g7 became the focal point where the white pieces pried the black killbox open.

The following pieces were traded or played no role:

Diagram 2. BLACK to move

• RED the white rook was traded with blacks dark squared bishop. That was a crucial defender of the dark squares around the black king. Notice that the focal point g7 is a dark square.
• BLUE black knight on b8 was traded for the white knight on d4. It just consumed 2 tempi, and invited the white Queen to d4.
• GREEN squares housed the pieces that didn't move. They played no significant role in either the attack or the defense

The following pieces delivered the final blow:

Diagram 3. BLACK to move

• RED whites attackers that delivered the final blow
• BLUE black pieces that tried to prevent mate but failed due to lack of coordination

Synopsis

This leads to the following narrative:

• Whites mobile pawns g4 and f4 chased away blacks Nf6 to a square where it couldn't coordinate the defense of g7
• g4 and f4 were sacced/traded in order to open up the LoAs g-file and f-file and they freed whites e3 bishop
• the main focal point was g7
• the trade of whites rook f1 against blacks dark squared bishop undermined the focal point g7 and weakened the dark squares around the black king
• the trade of blacks Nc8 against whites Nd4 was tempo consuming and didn't help
• in the end white had two pieces that didn't participate in the attack while black had three pieces that played no role

Final position

Diagram 4. BLACK to move

Whites last move was 21.Qe3 and black resigned. He can no longer prevent Bf6# and save his Queen.

Notice that there are five pieces on the board that play no role in either the attack or the defense. In the end it is three attackers against two defenders, but the defenders are too clumsy. That sheds a different light on the preconditions for an attack.