The Knocking Rules in Full
Knocking is the primary way to end a Gin Rummy hand. Understanding exactly when and how you can knock — and what happens afterward — is fundamental to playing correctly.
When You Are Allowed to Knock
You may knock on your turn if both of the following are true:
- You have drawn a card — either from the stock pile or the discard pile.
- Your deadwood total is 10 points or fewer — after arranging your cards into their best possible meld configuration.
Deadwood Point Values
| Card | Deadwood Value |
|---|---|
| Ace | 1 point |
| 2–9 | Face value |
| 10, Jack, Queen, King | 10 points each |
The Knock Threshold
In standard Gin Rummy, the knock threshold is always 10 deadwood points or fewer.
In Oklahoma Gin, the threshold changes each hand — the rank of the first upcard sets the maximum. A 3 upcard means only 3 or fewer deadwood points allow a knock that hand. A face card upcard keeps the threshold at 10.
How to Signal and Execute a Knock
Knocking is a deliberate, visible action. Here’s the correct procedure:
Step 1: Draw
Take a card normally — either from the top of the stock pile or the top of the discard pile.
Step 2: Arrange Your Hand
Mentally confirm your melds and count your deadwood. Ensure you’re eligible to knock (deadwood ≤ 10).
Step 3: Discard Face-Down
Place your chosen discard face-down on the discard pile. This face-down discard is the universal signal for a knock — it distinguishes the knock from a regular turn. Do not flip it up.
Step 4: Lay Out Your Hand
Spread your cards face-up on the table in two groups:
- Melds — your sets and runs clearly arranged
- Deadwood — your unmatched cards separated to the side
Your opponent can now see exactly what you’ve declared.
Step 5: Opponent Lays Off
Your opponent reviews your exposed melds and may lay off any of their deadwood cards that fit onto your melds.
Step 6: Count Deadwood and Score
Both players count their remaining deadwood. The knocker scores the difference — unless an undercut occurs.
What the Opponent Does After a Knock
After you knock and expose your hand, your opponent may:
- Lay off cards — add their unmatched cards to your exposed melds if they fit (extending sets or runs).
- Reveal remaining deadwood — whatever can’t be laid off counts against them.
The opponent cannot lay off onto cards that are in your deadwood — only onto your completed melds.
Scoring After a Knock
Standard Knock Score
Knocker’s points = Opponent’s deadwood − Knocker’s deadwood
This is always positive (in favor of the knocker) unless an undercut occurs.
Example: You knock with 6 deadwood. After lay-offs, your opponent has 17 deadwood. You score 17 − 6 = 11 points.
Undercut
If after lay-offs the opponent’s deadwood is equal to or less than the knocker’s deadwood, the opponent scores instead:
Undercut score = 25 (bonus) + (Knocker’s deadwood − Opponent’s deadwood)
Example: You knock with 9 deadwood. After lay-offs, your opponent has 7 deadwood. They score 25 + (9 − 7) = 27 points.
Zero-Point Knock
If both players end up with exactly equal deadwood after lay-offs and no undercut applies (in some rule sets), this can result in 0 points scored. Most standard rules treat equal deadwood as an undercut — the non-knocker wins.
Knocking vs. Going Gin
Knocking and going Gin are both valid ways to end a hand. Here’s when each applies:
| Knock | Gin | |
|---|---|---|
| Deadwood requirement | ≤10 points | Zero (0 points) |
| Signal | Discard face-down | Discard face-up, declare “Gin” |
| Opponent can lay off? | Yes | No |
| Gin bonus? | No | +25 points |
| Undercut possible? | Yes | No |
Common Knocking Rule Questions
Can I knock after taking the upcard at the very start?
Yes. If the non-dealer takes the upcard on the first turn and their deadwood immediately drops to 10 or below, they may knock right away — even on the very first action of the hand.
Can I knock if my deadwood is exactly 10?
Yes. The rule is 10 or fewer. Exactly 10 qualifies.
What if I accidentally lay my discard face-up but meant to knock?
House rules vary. In formal play, a face-up final discard is not a knock — it’s a regular turn. You cannot retroactively declare a knock. In casual play, players often allow a verbal announcement to clarify intent.
Can my opponent knock on the same turn I do?
No. Only one player acts at a time. Once you knock and lay out your hand, the hand is over — your opponent cannot knock in response.
Related Pages
- Going Gin — the alternative to knocking with zero deadwood
- Undercut Rules — when the knock backfires
- Laying Off — what happens after a knock
- Deadwood — how to calculate your knock eligibility
- Gin Rummy Scoring — how knock points fit into the overall scoring system