Magnus Carlsen vs Ian Nepomniatchtchi in an online tournament. It's a well-fought game with Magnus eventually pushing through with an enough of an edge that he will in all likelihood win, but then he accidentally drops his queen on the wrong square while moving it (it's an easy mistake to make, I've made the same mistake several times playing against the computer but I'm able to take back moves and Magnus is not).
So what happened? Magnus immediately resigned before giving Nepo the opportunity to offer him a draw. It shows the character of both players that Magnus believed Nepo would offer him a draw under those circumstances and so he quickly resigned because he didn't want such charity.
Here is the game cued up at the pivotal moment...
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