Gin Rummy

Play

Dealer: Choose an initial dealer. The dealer alternates between rounds.
Deal: Deal 10 cards to each player, starting with the non-dealing player. The remaining cards become the stock pile. The dealer flips up the first card of the stock pile to begin the discard pile.
Hand start: The non-dealing player has the option to take the card in the discard pile or pass. If they pass, then the dealer has the same option; otherwise the dealer takes a turn as normal (see below). If the dealer also passes, then the non-dealing player must draw from the stock pile, and play proceeds normally as follows.
Turns: At each turn, the player has the option to take the top card of the discard pile or the stock pile. They must then place a card in the discard pile. If they drew from the discard pile, they must discard a different card.
Hand end: Play continues until one player knocks or only two cards are left in the stock pile, in which case the hand ends in a draw with no points awarded.
Melds: The goal of each player is to form melds consisting of sets of cards of the same value or runs of cards of the same suit. Runs cannot wrap around from ace to king.
Knocking: A player can declare the hand over (knocking) when their deadwood score (the point value of the cards not contained in melds) is 10 or less. The deadwood score is the sum of the point values of each deadwood card, with all face cards valued at 10 points and aces valued at 1 point. The knocking player must clearly indicate their intention to knock and the display their melds and deadwood. The opposing player must immediately reveal their cards and can add any of their own deadwood cards to the knocking player's melds, unless the knocking player goes gin.
Gin: If a player goes down with no deadwood, they declare gin and the opposing player may not add any deadwood to their melds.
Big gin: This occurs if the pick-up card can also be incorporated into existing melds with no deadwood. Then the player declares big gin and puts down their full 11-card hand without discarding a card. The opposing player similarly may not add any deadwood.
Games: Hands (or "rounds") continue with alternating dealers until one player reaches 100 points (see below), at which point the game is over.

Scoring

Deadwood: At the end of each hand, the score of the knocking player is the difference between the opponent's deadwood score and their own. The opponent receives zero points.
Undercut bonus: If the opponent has equal or fewer deadwood points than the knocking player (after adding any deadwood cards to the knocking player's melds if possible), then the opponent receives the different in points plus a 15-point undercut bonus.
Gin bonus: If the knocking player has gin, then they receive the deadwood point different plus a 25-point gin bonus.
Big gin bonus: Like the gin bonus, but the knocking player receives a 50-point bonus.
Game bonus: The first player to reach 100 points (ending the game) receives a 100-point game bonus.
Line bonus: At the end of the game, each player receives 25 points for each hand won.
Shutout bonus: If a player has zero points at the end of a game, the other player's deadwood scores are doubled for that game.

GIN RUMMY

Setup

Play

Scoring

References