Oklahoma Gin is a variation of Gin Rummy which is a skill-based card game.

Number of players
Oklahoma Gin is a 2-4 players card game.

The Deck
Gin Rummy is played with a standard 52-card pack of playing cards. Aces are played only as low; the ranking from low-to-high is A-2-3-4-5-6-7-8-9-10-J-Q-K.

In a 2 player game each player is dealt 10 cards. In a 3-4 player game, each player is dealt 7 cards.

Cards Point values
The cards have values as follows:

Ace 1 point,
Number cards 2-3-4-5-6-7-8-9-10 are worth their value,
Face cards (K, Q, J) 10 points,

Sets
All cards in play must be arranged in sets with at least three cards. The two valid set types are called runs and groups.

• Run (sequence), consisting of three or more consecutive numbers of the same color

Example  3, 4, 5 or 8, 9, 10, J

•Groups, consisting of three or four tiles of the same number and different shapes

Example 6, 6, 6.

The goal in Oklahoma Gin is to be the first player to get rid of all the cards in your hand, by melding them into sets and runs and laying them down.

Normal round
Consists of two phases:

1. The Draw. The player must pull either the top card on the faced up discard pile, or from the top of the faced down stock pile (he can't see the card).
The player adds the card to its hand, but if he draws from the stock cards, it does not show the card to the other player.

2. The Discard The player must discard one card from its hand and placed it on top of the discard pile face up. If he took the top card from the discard pile, he cannot use it in the current round. Also taking the top discard and putting the same card back is not permitted.

Object of the Game
The object of the game is to collect a hand where most or all of the cards can be combined into sets and runs and the point value of the remaining unmatched cards is low

Deadwood (Unmatched cards)
Cards that cannot be arranged into set or run called Deadwood

The players must begin a turn by drawing a card either from the stock or discard piles, and adding it to their hand. To complete their turn, players must discard a single card from their hand onto the discard pile.

WINNING
three ways to win the game

Knocking

Knocking can be done on any turn (including first round), after the discard phase, provided that the value of the unmatched deadwood cards in player's hand does not exceed the value of the topmost card of the discard pile

(the up card). In other words the value of the topmost card of the discard pile decides the highest number of points a player need to knock in that particular hand

if the topmost card is an Ace The players must go for Gin (see below).

After players Knock, their defeated opponents may lay their melds down onto the table, and add matching cards to the Knocker's original melds only. Therefore, the Knock move provides the defeated players with an opportunity to reduce their amount of penalty points far more than Gin.

Knocking is obligatory. A player who is able to knock does not have to knock. He may instead choose to continue playing and try for gin or a lower total point count

Undercut

Is when a player deadwood count is equal to or lower to the the Knocker deadwood.

Undercut rewards the winners with 20 points

GIN

If a player manages to meld all his cards and has a zero deadwood count, then instead of knocking he declares Gin. Going Gin stops the game immediately (no layoff) and give the declare gin player 25 point bonus in addition to the deadwood count of his opponent.

After players Gin, the opponents may lay their melds down onto the table, to decrease their deadwood count and therefore reduce their amount of penalty points.

Example to gin hand :

Two sets one run

No win

if the stock pile is reduced to two cards, and the player who took the third last card discards without knocking, the hand is cancelled, there is no score, and the same dealer deals again.

scoring
After winning, each player counts the total point of its deadwood cards. If the knocker's count is lower, the knocker earns the difference between the counts. If the opponent's count is the same or lower, the opponent earns the difference between the two deadwood scores plus 10 point bones. Undercut rewards the winners with 20 Gin add 25 bonus points to the one declared Gin

Ending
The game ends as a player reaches the agreed number of points. Typical target score is 100.

Follow the link to Play Oklahoma Gin Online