I'm reading an article about poker in the most recent New Yorker magazine, and I came across a statement that seems like it can't be true.
It says: "Games for which a flawless strategy is known are said to be solved. Tic-tac-toe is solved: blackjack is solved; checkers is solved. Chess is not solved, and poker is not, either. Solutions theoretically exist; they are simply too intricate, so far, to be comprehended. Among mathematicians, chess is regarded as a game of perfect information, because nothing is hidden. If its ideal strategy were discovered, there would no longer be any reason to play it--no move could be made for which the responses was not already identified. Poker is a game of imperfect information, since so much is concealed."
So, my question is: in what way is blackjack solved? Isn't the dealer's hole card concealed? Am I missing something?
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