Etiquette zugzwang
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Some players (especially beginners) play to the end. I don't think there's a breach of etiquette. It's another issue if he deliberately time forfeits instead of resigning. But always give the benefit of the doubt to your opponent (unforseen circumstances).
I am playing a game where I am a queen, a bishop and three pawns up. I also have mate in seven. But the other guy is not resigning. Is there some breach of etiquette? I don't want to say something wrong, as that may spoil the victory. I also don't want to look arrogant. Should I say something???