"Extremely Rare"?
Now seems like a good time to pause and consider what just happened.

Draw by insufficiant material is quite common. It's rare for grandmasters to have games north of 100 moves, but common for beginners since they frequently can't find a winning line or tactic in spite of boundless opportunities.
I highly reccomend players get active in the chess community and help out at a few scholastic tournaments. It's easy to becone a TD and help out on the floor. If it's a large tournanent, you might not have the credentials to make rulings, but you can get a higher level TD to rule. In large scholastic events, they're always grateful for more volounteers.
It's a good way to have fun and get a different perspective at scholastic tournaments. In the kindergarten to 3rd grade crowd, its very common for 2 players to make random moves at the endgame phase, putting each others king in check but not realizing it. But the floor has kids of all ages and ratings.
After a few minutes of both players not knowing how to finish a game, the TD declares it a draw..

I actually had that once, in the 1990's at a USCF tournament and won the game.
In retrospect, the only two games of that decade that were memorable was that KBN vs K win, and another game where I drew an 1800 when I was rated 1350.
I'd be embarrassed to use the same strategy to draw an opponent over 400 points above me nowadays, by making the board so complicated, it becomes difficult for the higher rated player to find a winning line. But back then it was not only acceptable, but it was one of Bruce Pandolfini's list of chess wisdoms.
Another reason that strategy doesn't work is because online chess has made it so most chess players have seen so many complicated board positions that there is no surprise factor involved in that strategy. Players just take it in stride.

Position shown is a draw. No need for White to resign. Request draw and computer should accept (insufficient material as per #5 above).
And yes, Bishop/Knight mates are very rare. They can be done if studied, but usually so rare not studied. I wouldn't be able to complete.

Position shown is a draw. No need for White to resign. Request draw and computer should accept (insufficient material as per #5 above).
And yes, Bishop/Knight mates are very rare. They can be done if studied, but usually so rare not studied. I wouldn't be able to complete.
It is curious that he was playing a chess engine and the game wasn't declared a draw by the computer immediately after the knight was captured by the king.
If the OP was playing the chess.com computer, that needs to be submitted as a bug report.

I agree this event is truly rare and full of chivalry
The bishop followed the code of chivalry and didn't capture the queen but the queen chose to give the bishop another chance to finish her off, but he still refused, so the queen took the bishop herself forcing the trade.
Then the battle contiues as the other takes as little of the other peices as they can while offering the oppenent oh so much. So far still a true battle of chivalry.
Then the queen blocks herself in front of the king sacrificing her life away
And then the pawns have a sprint and chose to evolve into a...
KNIGHT!!!
A truly chivalrus warrior to be chosen.
And then the holy bishop and knight chase the enemy all around the board but the king eventually captures the knight who had been narrowally missed the knig multiple times
Yes an extremely rare case of chivalry indeed.
An 126 move game of complete destruction
you my friend have made a game that is as bright as a gem!

In 40+ years of playing chess, that game I mentioned in the 90's was the only instance of me having the KNB vs K ending, not just in tournament play either.
seems that you should've won the game. I think it's difficult to win with bishop knight but should be possible.