Back to the Question: Why do master chess players resign when they're about to lose?
I see it in books and in games displayed here. There will be a Master game being discussed and then it shows one resigns.
No explanation that in seven moves they saw a mate in several variations or a overwelming gain in material.
So I can never see those variations in my head. I assume there would be a loss but I didlike when they do that. Sometimes I pose the question for a continuation of the game but it isn't done.
Then is some instances the author is wrong and someone points out a way to win the game.

Opponents who don't resign volunteer to help me practice the B+N mate.