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Card counting is something a child can understand.

https://en.wikipedia.org/wiki/Card_counting

Asking to prove it is like asking to prove that tic-tac-toe is a solved game, since its trivial to understand how it works

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This is a confusing misinterpretation of the parent comment. He isn't saying it isn't easy to count cards, rather that there isn't a widely seen public method to do it in 2020, and that there isn't math to prove it is profitable with casinos targeting advantaged players.

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