Gin rummy is a two-player card game in which players draw and discard cards to build combinations and reduce unmatched cards. The traditional form described in Hoyle's Rules of Games uses a standard 52-card pack, with no jokers. The usual objective is to reach an agreed target score, often 100 points, although players can choose a different target before starting.
Each player tries to arrange their hand into melds and keep as little deadwood as possible. Melds are valid combinations of cards. Deadwood means cards that do not belong to any meld. A player can end a hand by knocking when the deadwood count is low enough, or by declaring gin when all ten cards fit into melds.
The game rewards two different skills. You must build your own combinations, but you must also watch which cards the other player takes and discards. A card that looks useful to you may be dangerous to discard if it completes an obvious sequence for your opponent.
Use one standard 52-card deck. Suits are separate, and cards have the following values for deadwood scoring: aces count as 1 point, numbered cards count at face value, and jacks, queens and kings count as 10 points each. These values are also the values used when calculating the difference between a knocker's deadwood and the opponent's deadwood.
In the traditional deal, each player receives ten cards. The next card is placed face up to begin the discard pile, and the remaining cards form the face-down stock. The non-dealer normally has the first opportunity to take the face-up card. If that player passes, the dealer may take it. If both players pass, the first player draws from the stock instead.
After the opening choice, turns follow the same pattern:
Players must normally finish a turn with ten cards after the discard. The top discard is public information, while the stock cards remain hidden. If the stock becomes very low without a player ending the hand, the deal may be treated as a draw according to the agreed rules. Players should settle this detail before play because local versions differ.
A meld is either a set or a run. A set contains three or four cards of the same rank in different suits, such as 7♣, 7♦ and 7♥. A run contains three or more consecutive cards of the same suit, such as 4♠, 5♠, 6♠ and 7♠.
Several restrictions matter:
Cards cannot be used in two melds at the same time. For example, 5♥, 6♥, 7♥ and 7♣ can be arranged as a run of 5♥, 6♥, 7♥ plus a single deadwood card, or the three sevens could not form a set because only 7♥ and 7♣ are present. A card belongs to whichever arrangement produces the most useful legal result when the hand ends.
During the hand, players do not usually place melds on the table. They keep possible combinations in their own hands and reveal them when knocking or declaring gin. This hidden information is one reason discard choices require care.
Deadwood is the total value of cards left outside the chosen melds. To calculate it, first find the best legal combination of sets and runs. Then add the values of every card that remains unused.
For example, suppose a hand contains 3♣, 4♣, 5♣, 9♦, 9♠, K♥, 2♦, 6♠, 7♠ and Q♣. The run 3♣, 4♣, 5♣ and the set 9♦, 9♠ cannot be a complete set because it has only two cards. The spade cards 6♠ and 7♠ also do not form a complete meld. One possible arrangement therefore leaves 9♦, 9♠, K♥, 2♦, 6♠, 7♠ and Q♣ as deadwood, for a total of 52 points. The hand may have another arrangement if a different grouping is available, so players should test all plausible combinations before deciding to knock.
At the end of a hand, a player may discover that a card can be assigned either to a set or to a run. The correct choice is the one that minimizes deadwood or creates the best legal opportunity for laying off cards. Keeping a written list of card values can help new players avoid counting a face card as 11, 12 or 13. In gin rummy, every jack, queen and king is worth 10 points.
A player may knock after drawing and before discarding when the total deadwood is 10 points or fewer under the traditional rules described in Hoyle's Rules of Games. The player discards one card, reveals the hand, separates the melds from the deadwood, and announces the deadwood total. The opponent then reveals their cards and calculates their own melds and deadwood.
The opponent may usually lay off eligible deadwood cards on the knocker's exposed melds. For example, if the knocker shows 4♥, 5♥ and 6♥, the opponent may add 3♥ or 7♥. If the knocker shows three queens, the opponent may add the fourth queen. A card cannot be laid off if it would create an invalid combination, and a card already used in one of the opponent's melds cannot be used again.
After any permitted layoffs, compare the remaining deadwood totals. If the knocker has less deadwood than the opponent, the knocker scores the difference. If the totals are equal, the hand is generally a tie, often called a draw or tie hand, and no difference score is awarded. Some groups use a separate bonus for this situation, so that detail should be agreed in advance.
A player declares gin when every card in the hand belongs to melds after the required draw and discard sequence. In practical terms, the player has no deadwood. A gin declaration ends the hand immediately, and the opponent does not lay off cards against it.
Under the traditional scoring commonly given in Hoyle's Rules of Games, a gin earns the value of the opponent's deadwood plus a gin bonus. The bonus is commonly 25 points, but players should confirm the scoring version before beginning because published and house rules can vary. The important principle is that gin is worth more than an ordinary knock and prevents the opponent from reducing their count through layoffs.
An undercut occurs when the opponent's deadwood is equal to or lower than the knocker's deadwood after layoffs. Instead of receiving the difference, the opponent scores an undercut bonus plus the difference between the two deadwood totals. The undercut rule makes a marginal knock risky. Knocking with 10 points may appear safe, but the opponent may have 9 points or less and turn the hand around.
For clarity, players should write down three separate items after every hand: the knocker's deadwood, the opponent's deadwood after layoffs, and the bonus category. This prevents ordinary knock points, gin points and undercut points from being confused.
The following examples use the traditional 25-point gin bonus and a 25-point undercut bonus often associated with standard gin rummy rules. Because scoring variations exist, agree on the bonus values before dealing.
| Situation | Knocker or declarer | Opponent | Score |
|---|---|---|---|
| Ordinary knock | 4 deadwood points | 11 deadwood points after layoffs | Knocker scores 7 |
| Undercut | 8 deadwood points | 6 deadwood points after layoffs | Opponent scores 27, made up of 25 plus 2 |
| Gin | 0 deadwood | 18 deadwood points | Declarer scores 43, made up of 18 plus 25 |
In the first example, the knocker scores the difference of 7. In the second, the opponent has fewer deadwood points, so the opponent receives the undercut bonus and the two-point difference. In the third, the opponent cannot lay off cards because the declaration is gin. The hand score is based on the opponent's full deadwood total plus the gin bonus.
Some versions add a line bonus when a player wins a number of hands in succession, or an end-of-game bonus when the target score is reached. These additions are not universal. A written score sheet should identify the exact scoring system being used rather than relying on memory.
The strongest practical decisions often happen before a player is close enough to knock. Consider these habits:
A common error is to chase a nearly complete run while holding several expensive unmatched cards. If the needed card does not appear, the hand may remain far above the knocking limit. Another error is to discard a card that completes the opponent's visible pattern. Good play balances the chance of improving your hand against the information revealed by your discard.
New players can use a fixed routine on every turn:
When close to a knock, calculate the opponent's possible layoffs before ending the hand. A hand with 5 deadwood may not be as safe as it seems if the opponent is likely to have a card that can be added to one of your melds. Conversely, a higher deadwood total may be acceptable when your opponent's visible cards suggest a weak hand. Beginners should prioritize accurate counting and legal melds before attempting complex deductions.
Gin rummy has a stable traditional structure, but groups sometimes modify the opening draw, target score, bonus values, stock exhaustion and whether certain special bonuses apply. These changes can alter strategy, so players should state them before the first deal.
Three points deserve particular attention. First, confirm whether the opening face-up card can be taken by the non-dealer and then by the dealer, or whether a local version uses a different opening procedure. Second, confirm the gin and undercut bonuses. Third, confirm what happens if neither player ends the hand before the stock is exhausted.
The safest approach is to name the ruleset being followed, use one score sheet, and resolve unusual situations before the next hand. Consistency matters more than adopting a complicated set of optional bonuses.
Yes, in the traditional form described in Hoyle's Rules of Games, a player may knock with deadwood totaling 10 points or fewer. A group using a different threshold should announce it before play.
No. In standard gin rummy, the ace is low. A, 2, 3 is a valid run, while Q, K, A is not.
No. A gin declaration ends the hand without ordinary layoffs. The opponent's entire deadwood count is used for the gin score.
This is an undercut. The opponent receives the agreed undercut bonus plus the difference between the knocker's deadwood and the opponent's lower total.
No. The basic ideas of knocking, gin and undercutting are widely recognized, but bonus amounts and additional bonuses can vary. Agree on the scoring sheet before the deal.
