Blockers: cards that shrink an opponent’s range
A blocker is a card in your hand that makes certain hands less likely for your opponent. If you hold an ace, there are fewer ace-ace and ace-king combinations left. Players use blockers to pick bluffs and tough calls.
Reviewed Oct 15, 2026
Answer first
90s- 01Pocket aces have 6 combinations; one ace in your hand leaves 3.
- 02Ace-king has 16 combinations; one ace leaves 12.
- 03The ace of a suit blocks the nut flush in that suit.
Key numbers
Combos with and without blockers
In short
Key takeaways
- Combos tell you how likely a hand is.
- Blockers matter most against narrow ranges.
- The nut flush blocker is one of the strongest.
- Blockers never turn a bad spot into a good one alone.
On the felt
The ace of hearts as a blocker
Your hand
You hold the A♥
Board
Three hearts
Effect
No one else can have the nut flush
Combination counts
| Hand | Total combos | You hold one ace | You hold A and K |
|---|---|---|---|
| A-A | 6 | 3 | 3 |
| K-K | 6 | 6 | 3 |
| A-K | 16 | 12 | 9 |
| A-Q | 16 | 12 | 12 |
| Any pair | 6 each | — | — |
Our own counts.
How combinations work
Each pair can be dealt 6 ways, since there are 4 cards of each rank and 6 ways to pick 2. Each unpaired hand like ace-king has 16 ways, 4 × 4. Suited versions are 4 of those 16.
When you hold one ace, only 3 aces remain. Pocket aces drop to 3 ways, and ace-king drops to 3 × 4, or 12. Holding an ace and a king cuts ace-king to 3 × 3, or 9.
Against a tight range of A-A, K-K and A-K, your blockers cut the strong hands a lot, which can make a bluff or call better.
Where blockers help most
| Spot | Useful blocker | Why |
|---|---|---|
| River bluff on three-flush board | Ace of that suit | Blocks the nut flush |
| Calling a big 4-bet | An ace | Fewer A-A and A-K |
| Bluff on paired board | Card of that rank | Fewer full houses |
| Bluff on straight board | Key straight card | Fewer straights |
Our own summary of common advice.
Using blockers when bluffing
A good river bluff targets hands that will fold. If you hold the ace of the flush suit, your opponent cannot have the nut flush, so their best hands are weaker.
You also want to avoid blocking the hands that fold. If you hold a card that makes their missed draw less likely, a bluff may be called more often.
Blockers are a tie-breaker between similar hands, not a reason to bluff in a bad spot.
Sequence
Thinking about blockers
Step 01
Name their range
Which hands do they have?
Step 02
Count combos
6 for pairs, 16 for others.
Step 03
Remove your cards
Cut the combos you block.
Step 04
Compare
Value hands vs bluffs.
Step 05
Decide
Bluff, call or fold.
Common blocker spots
Before the flop, holding an ace makes a 5-bet bluff better, because the opponent has fewer A-A and A-K hands.
On a board with four cards to a straight, holding one of the key cards makes it less likely your opponent has the straight.
Live players often overvalue blockers. Use them with sound pot odds and a clear read of the range.
Floor rules
Blocker terms
Know before you sit
- Blocker
- A card in your hand that removes combinations from a range.
- Combination
- One exact way to be dealt a hand.
- Range
- All hands a player could have.
- Nut flush
- The best possible flush on that board.
Common mistakes
- Bluffing on blockers alone
- The spot must make sense.
- Ignoring board cards
- They block too.
- Blocking the folds
- Bad bluffs block missed draws.
- Forgetting suits
- Suited combos are 4 of 16.
Keep reading
Related pages
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01Basics
What is a blocker in poker?
A card in your hand that makes certain hands less likely for your opponent. Rules vary by cardroom, so check the posted house rules.
How many ways are there to be dealt aces?
Six. With one ace in your hand, three remain. Rules vary by cardroom, so check the posted house rules.
How many ace-king combos are there?
Sixteen. With one ace in your hand, twelve remain. Rules vary by cardroom, so check the posted house rules.
02Use
Why is the ace of a flush suit a good blocker?
It means no one else can hold the nut flush in that suit. Rules vary by cardroom, so check the posted house rules.
Should I bluff more with blockers?
Only when the spot already makes sense. Blockers help choose which hands to bluff with.
Do board cards block?
Yes. A king on the board leaves only three kings for other players. Rules vary by cardroom, so check the posted house rules.
03Math
How many starting hands are there in hold’em?
1,326 combinations, or 169 distinct types. Rules vary by cardroom, so check the posted house rules.
How many combos are suited?
Four of the sixteen combinations of any unpaired hand. Rules vary by cardroom, so check the posted house rules.
Do blockers matter in live games?
Yes, but live players call more, so use them with care on bluffs. Rules vary by cardroom, so check the posted house rules.
Sources
- Wikipedia — Poker probability (Texas hold ’em) Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Starting hand and draw odds
- Wikipedia — Texas hold ’em Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Rules and betting rounds
- Wikipedia — Poker strategy Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Bluffing, semi-bluffing and pot odds
- National Council on Problem Gambling — Help and resources Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Free, confidential help: call or text 1-800-GAMBLER