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Gin rummy, or simply gin, is a two-player card game created in 1909 by Elwood T. Baker and his son C. Graham Baker.
The player who did not deal the cards starts the game, with the option to pick up the upturned card next to the stock deck, meaning that one of their cards must be discarded. If the said card is of no interest, the player passes without discarding. The opponent may, in turn, take that card and discard another, and if they are not interested, they pass without discarding. Then the first player can now take the top card off the stock deck, discarding another. The game continues, with each player in turn being able to take the top card off the stock deck or the discard pile, then discarding a card, but which may not be the same card that they just picked up from the discard pile.
The game consists of players grouping the 10 cards in their hand to make minimum combinations of three cards of the same rank or runs of the same suit. The ace can be combined with the deuce but not with the king (K). A player can fold when their hand contains only unmatched cards worth a total value of no more than 10 points, making a Knock. As soon as a player discards their last card, they show all of their cards, announcing the number of points that are left without combining. It is not compulsory to Knock, a player can prolong the game in order to improve their hand. The best hand is to make Gin, consisting of placing down the ten cards combined.
In either case, when a player folds, exposing all of their cards, the opponent does the same, having the opportunity to get rid of those cards that were left unmatched and being able to combine cards with those exposed by the player who Knocked or announced Gin. A partial game also ends when there are only two cards left in the deck, this game is declared null and the same player cards deals out a new hand.
When a player announces Gin they win the partial game, whereas if a player Knocks, either that player or the opposing player can win it. The player wins if the value of their unmatched cards is less than the value of the opponent’s unmatched cards and the opponent wins if the value of their unmatched cards is equal to or less than that of the one that Knocked.
The cards of the opponent to the one who announced Gin or Knocked are valued after having discarded the cards that they have not combined and that link with combinations of the hand laid down by the one declared Gin or Knock.