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Blockers
Lesson 14 · Which bluffs to fire and which to skip · 32 practice questions
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A blocker is a card in your hand that villain therefore cannot hold. Every hand he could have is made of specific two-card combinations, and each card you hold deletes some of them. On a board with three hearts there are many possible flushes, but only the ones containing the highest missing heart are the nut flush — hold that heart yourself and he can never have it. Blockers do not change how strong your hand is; they change how likely villain is to have the hands you fear, or the hands you want him to have. They matter most on the river, where ranges are narrow and one card can remove a large share of his value hands.
Example. River K♥7♥3♥2♦9♣, you hold A♥Q♦. Villain cannot hold the nut flush, because you hold the A♥ — his best possible flush is now second best, and he knows it. On 9♦8♣7♥6♠2♦ with A♥6♣ facing 25 into 30 it is the opposite: you need 25/(30+25+25) = 31%, and your ace blocks nothing that matters — any ten or five makes the straight, and you hold neither. A pair of sixes with no useful blocker is a fold.
Common mistake: counting any high card as a blocker. A blocker only matters if it removes combinations from the specific hands that decide this pot — the nut flush, the straight card, the top set.
Bluff with blockers
The best river bluffs have two properties at once: no showdown value, and a blocker to the hands that would call. When you hold the nut-flush card on a three-flush board, villain's calling range loses its strongest part, and what is left — one pair, two pair, weak flushes — folds to a big bet much more often. The reverse matters just as much: do not bluff with cards that block villain's folding hands. If you hold a missed draw yourself, he holds fewer missed draws, which means more of his range is made hands that call.
Example. River K♥7♥3♥2♦9♣, pot 18, villain checks, you hold A♥Q♦: ace-high will not win at showdown here, and the A♥ removes his nut flushes — bet. The same on 7♠5♠2♠9♦3♣ with K♠Q♥ (pot 22): the K♠ blocks the second-nut flush and much of his calling range. But on Q♠8♠4♠2♥7♦ facing 10 into 20 with A♠J♣ the blocker does not make a call: you need 25%, and ace-high beats almost none of the hands that bet here — fold. A blocker is a reason to bet, rarely a reason to call with nothing.
Common mistake: bluffing every time you hold the ace of the suit. If villain has shown strength on earlier streets, he has the flushes that do not need the ace — a blocker improves a good bluffing spot, it does not create one.
Value & blockers
Blockers cut both ways when you hold a real hand. For bluff-catching, the ideal hand blocks villain's value and leaves his bluffs alone: top pair with an ace on an ace-high board removes many of his strong aces, so a larger share of his betting range is bluffs. For value betting it is the opposite: if you hold the cards villain needs in order to call, he calls less often. With top set you block many of the top pairs that would pay you, so thin value bets gain less — while the nuts on a board full of second-best hands should bet big, because those second-best hands are all still available to him.
Example. River A♦8♣5♥3♠2♦ with A♥T♣ facing 20 into 30: you need 20/(30+20+20) = 29%. Your ace blocks A-K, A-Q and A-8, and his missed draws are untouched — call. Without a pair the ace does much less: on Q♦Q♣9♠6♥3♦ with A♠J♦ facing 24 into 24, ace-high loses to every value hand and to some bluffs — fold. Now compare two hands on J♥8♦4♣9♠2♦ against 20 into 30: A♥Q♥ beats every missed draw and its queen removes some of the Q-T straights — call; K♥T♥ loses even to ace-high bluffs, and its ten removes draws he would be bluffing with — fold.
Common mistake: using a blocker to justify a call with a hand that beats nothing. Blockers choose between two similar bluff-catchers; they do not turn king-high into one.
Key takeaways
• No showdown value, villain checks, and you hold the nut-flush card → bet as a bluff.
• Showdown value (a pair) and villain checks → check; do not turn it into a bluff.
• Facing a bet with a pair that blocks his value (an ace on an ace-high board) → call.
• Facing a bet with no pair and only a blocker → fold unless the price is tiny (one-third pot or less) and you beat his bluffs.
• Two similar bluff-catchers → call with the one that blocks value, fold the one that blocks his missed draws.
Sample drill from this lesson
Best action?
Board: K♥ 7♥ 3♥ 2♦ 9♣
Your hand: A♥ Q♦
Best action: Bet Check
Why: ✓ No pair and no draw — here bet is a bluff: it wins when better high-card hands and weak pairs fold, and it keeps your betting range from being only value.
FAQ
What are blockers in poker?
Blockers are cards in your hand that reduce the combinations of hands your opponent can hold. Holding the ace of a suit, for example, makes the nut flush less likely for them.
How do blockers help you pick bluffs?
The best bluffs block the opponent’s value and calling hands while unblocking their folds — so you fire hands that make it less likely they hold a call.
Key terms in this lesson
Range (Poker Hand Range) · Bluff Catcher · Value Bet · Showdown Value · Blockers · Thin Value Bet
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