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I’m not arguing. Maybe it’s the circumstances.
But then just say that the circumstances have changed and you can’t continue the game.
But don’t say that you don’t feel like playing. After all, you’re playing with a person.
Your opponent is ready for the game, they’re waiting, they’re nervous, the game has started, and then – bam – and you say you don’t want to continue.
There are more polite ways to end a game, you know?
It just feels a bit unsportsmanlike.
Just my opinion, of course.