According to Wikipedia the B+N endgame occurs once every 6000 games. Some GMs never have it their whole career. I just got it:
It was also my longest game ever. I was hoping it would also be my first game invoking the 50 move rule, but he stalemated before. My defense was simple: Staying in the corner that he does not control with his bishop.
ohh you stalmated and great game with over 100
That statistic is questionable (since many would resign before such a situation).
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The bishop and knight checkmate is the most difficult to force. I thought there was only one method, the triangle method, but then I learned the W method from my coach. Here’s a short explanation of each method:
1. Triangle method: Use king and other pieces to restrict the king to three triangles.
2. W method: Your knight makes a W-like pattern to prevent the king from escaping to the wrong corner.
It's very difficult if you haven't studied it. If you have it's not that hard, but not exactly trivial either.
White should learn the bishop and knight mate from: lichess.org/practice/checkmates/knight--bishop-mate/ByhlXnmM/D23EYigW, or en.m.wikipedia.org/wiki/Bishop_and_knight_checkmate#Method
before playing games because such situations arises.
Also, you should not have captured the g5 pawn this giving away rook as the evaluation was just 1.7 and it wasn't easy for White to convert it into a victory. And seeing it's endgame skills, I assume if you hadn't captured the pawn either the game would end in a draw or loss on timeout for White.
It takes a lot of practice to force the checkmate, and I am not used to the W method in all positions.