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I disagree as well. I think even D players can catch mistakes made by A players. Even if they're not mistakes, it forces the A players to think and defend their position, to the benefit of both. If there are, hypothetically, 1000 things to do right in poker, and an A player does 900 of them right, a Be player does 800, etc, there are no guarantees that the A player is doing everything right that the B player is doing.

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