At GameColony.com, gin rummy is played by two players with a standard 52-card pack. The players can choose the maximum points for a game (from 50 to 300). In 100 points game, the game is won by the 1-st player who reaches 100 points which may take several deals.
Cards rank A 2 3 4 5 6 7 8 9 10 J Q K where ace A costs 1 point, subsequent cards cost their nominal value up to 10, however Jack, Queen, King cost also 10 points each.
The object of the game is to collect sets of 3 or more cards that go together, either being of the same rank, like all sevens, or forming a sequence of the same suit like 7,8,9 of hearts. Such matching collections of cards are called melds.
At the end, whatever cards are left in players hand that are NOT in melds, are called deadwood. Deadwood incurs penalties equivalent to the sum of their values. In the course of the game, players would try to discard unwanted cards and collect cards that would form melds.
In the example on the left, the player's own cards are on the bottom (they are open) & the opponent's cards are on top (closed).
The up card (10 of Diamonds) is visible to both players. The deck has 30 cards left in it (indicated by number 30).
It is the turn of the 'bottom' player whose cards are visible to make a discard (there are 11 cards in hand).
The player is about to make a discard by dragging one of the cards from hand to cover the up card (10 of Diamonds).
The player whose cards are visible has 1 meld in hand (3 Kings). The rest of the hand is deadwood. The current value of the deadwood in points (before the discard) is: 1 + 2 + 3 + 4 + 5 + 6 + 8 + 9 = 38 points.