Knocking is how you end a hand of Gin Rummy. It’s the moment when the hidden cards come out, deadwood is counted, and points are scored. Understanding the knock rules — including when you can knock, the exact procedure, and the risk of being undercut — is essential for every Gin Rummy player.
What Is Knocking?
Knocking ends the current hand. Instead of placing your discard face up as usual, you place it face down — signaling that you believe your remaining unmatched cards (deadwood) are worth 10 points or fewer.
After a knock:
- Both players lay their cards on the table
- The non-knocker may lay off cards onto the knocker’s melds
- Deadwood totals are compared and points are scored
Knocking is optional. You can knock any time your deadwood is ≤ 10, but you’re never forced to.
Eligibility: When Can You Knock?
You can knock when all three conditions are met:
- It’s your turn — you’ve just drawn your card (from the stock or discard pile)
- Your deadwood total is 10 or fewer — count all cards not in valid melds
- At least one card has been drawn (you can’t knock before any play occurs in exceptional first-turn edge cases)
Counting Your Deadwood
| Card | Deadwood Points |
|---|---|
| Ace | 1 point |
| 2 through 9 | Face value |
| 10, Jack, Queen, King | 10 points |
Example: Your hand contains melds (7♠ 7♥ 7♦) and (5♣ 6♣ 7♣), with remaining deadwood cards 8♦ and 2♥. Deadwood = 8 + 2 = 10 points — you are eligible to knock.
The Knock Procedure
1. Draw Your Card
Knock happens after your draw, not before. Take your card from the stock pile or discard pile first.
2. Discard Face Down
Instead of placing your discard face up, put it face down on top of the discard pile. This is the knock signal.
In many social games, players literally knock on the table with their knuckles — hence the name. Either convention works; the face-down discard is the clearer signal.
3. Lay Your Hand Face Up
Spread your 10 cards face up on the table, clearly separated into:
- Melds — your valid sets and runs grouped together
- Deadwood — your unmatched cards displayed separately
Your hand is now fully exposed and cannot be changed.
4. Opponent Lays Off (Optional)
The non-knocker now has the opportunity to lay off — add their unmatched deadwood cards onto your displayed melds to reduce their own deadwood count.
Lay-off rules:
- Can only add to the knocker’s melds, not create new melds of their own
- Can extend any of the knocker’s sets (e.g., add the fourth card to a three-card set)
- Can extend any of the knocker’s runs from either end
Example: You knock with the meld 5♣ 6♣ 7♣. Your opponent holds 4♣ and 8♣ as deadwood. They can lay off both cards onto your run (extending it to 4♣ 5♣ 6♣ 7♣ 8♣), saving 4 + 8 = 12 points.
Important: Lay-offs are only allowed after a regular knock, never after Gin. When a player goes Gin, their melds are sealed.
5. Count Deadwood and Score
Once lay-offs are complete, both players count the point value of their remaining unmatched cards.
Result A: Knocker wins If the knocker has fewer deadwood points than the opponent, the knocker scores the difference.
Knocker deadwood: 8 points. Opponent deadwood after lay-offs: 23 points. Knocker scores: 23 − 8 = 15 points
Result B: Undercut (opponent wins) If the non-knocker has equal or fewer deadwood points after lay-offs, the knocker is undercut. The opponent wins the difference plus a 25-point undercut bonus.
Knocker deadwood: 8 points. Opponent deadwood after lay-offs: 6 points. Opponent scores: (8 − 6) + 25 = 27 points
Going Gin: The Better Knock
If you arrange all 10 cards into valid melds with zero deadwood, you can go Gin. Going Gin is a form of knocking with major advantages:
| Regular Knock | Gin | |
|---|---|---|
| Requirement | Deadwood ≤ 10 | Deadwood = 0 |
| Opponent lay-offs? | Yes | No |
| Bonus points | None | +25 points |
| Score | Opponent’s deadwood | Opponent’s deadwood + 25 |
How to go Gin: Discard your final card (or place it face down). Then announce “Gin” and lay your complete hand on the table — all cards in melds, nothing left as deadwood.
Big Gin: Holding All 11 Cards
In some rule sets, after drawing your 11th card you may choose not to discard and declare Big Gin if all 11 cards form valid melds. This earns your opponent’s full deadwood plus a 31-point bonus (some rules use 25 or 50 — agree before playing).
Big Gin is rare and not used in all rule sets. Confirm with your opponent before playing.
Knock Timing Strategy
Knowing when to knock is one of the most skill-intensive decisions in Gin Rummy. See When to Knock for a full strategy breakdown. Key principles:
Knock early when:
- Your deadwood is very low (3 or fewer) and your opponent has had multiple turns
- You’ve seen your opponent drawing many cards from the discard pile (they may be close but not quite there)
- The hand has been going long and both players are grinding — a knock ends it on your terms
Wait for Gin when:
- You’re one card away from Gin with a low-probability discard on the pile
- The score is close and you need the Gin bonus to take the lead
- Your opponent has high deadwood and lay-offs are unlikely to hurt you
Avoid knocking with 8–10 when:
- Your opponent has been discarding low-value cards (possible sign of low deadwood)
- Many turns have passed and your opponent has had time to build melds
- You’re already comfortably ahead in the game score
Common Knock Mistakes
| Mistake | What to Do Instead |
|---|---|
| Knocking with 11+ deadwood | Always count before knocking — penalty hands hurt badly |
| Forgetting to lay off before counting | Non-knocker always gets lay-off opportunity first |
| Knocking when opponent is close to Gin | Watch their discard pattern for signals |
| Never knocking and always chasing Gin | A consistent 5–8 point knock wins more games than missed Gin attempts |
Next Steps
- How to Score a Hand — Points, undercut, Gin bonus, and box totals
- When to Knock — Strategy guide for knock timing
- Full Beginner’s Guide — The complete game from start to finish