A hand in which a player is guaranteed to at least split the pot with his/her opponent, with a chance to win the pot outright. For example, if you have A&` A&c and your opponent has A&e A&f, and the board comes 8&`9&`2&fQ&`, you're freerolling the ability to win the whole pot with a made flush if a spade hits on the river.

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Like in the games of chess, Go (game), and many other games, artificial intelligence systems beat even the best humans at poker. Poker is a game of imperfect information (because some cards in play are concealed) thus making it harder for anyone (including a computer) to deduce the final outcome of the hand.

Secondly, the broad set of hidden information of the tiles makes Mahjong a much more difficult imperfect-information game than previously studied ones, such as Texas hold'em poker. Thirdly, the playing rule of Mahjong is much more complicated because of the various actions involved.