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After this, I learned a lesson: If I can't play towards the end of the term (let's say, the last 2-3 days of the tournament) or if I have a bad relationship with my opponent, I should write in the online/offline chat every day to let them know when I can play. That way, they can't blame it all on me later. I've been holding this in, so I decided to vent. Pit and Duty, please don't delete this message.
Yes, I already realized that the opponent wasn't writing anything, and neither was I. As a result, I ended up being blamed. Moreover, the opponent specifically didn't want to play during the deadlines after we had already discussed it, and instead decided to win for free.