What is a Blocker?

I have been away from poker for quite a while and getting back into watching poker content again. One thing that is new to me is the term "Blocker". Can someone explain to me what that means? I hear them say that someone has a blocker to a straight or somthing like that, I don't know what they mean.

If you have AQ, and raise, then you are suggested to be blocking AA and QQ, as you have 1 of each of those cards.

So, you can remove many of those combos when assessing the opponents range on later streets, On a Q high flop, its much less likely they pocket Q's, than say if you had AK or AJ....as you 'block' the Q

Welcome to the forum BTW.....

It’s a hand that makes it tough for your opponent to have. You have 99 on a 78T, you’re blocking your opponent from having a straight. A clubs on a three club board, your blocking them from having the nut flush. AK is blocking AA, KK etc.

A blocker is simply a referral to the fact that your Villain can have fewer combos of hands because you hold that card

ie you have QT your V can have fewer combos of hands that contain Qx or Tx--if you can narrow your opponent down to a balanced value bet or bluff situation and your QT blocks them having the value portion of their range, we can call more often because our odds of catching a bluff are higher and the pot is offering the correct odds. The reverse is true as well if we block hands the V has that bluff then the V has more value hands and we should fold.

The mistake made with blockers is: they become irrelevant when the V does not balance. If the V is supposed to have 1 bluff for every 2 value hands to be balanced, we can use blockers. In the same spot if the V has 1 bluff per 3 value hands --as most tight micro players will have at least that or worse- our blocker does not matter at all

Simplified example---the reason it does not matter is a blocker in the 1-2 balanced situation may make the ratio 1 to 1.8 thus giving us the ev to call. In the 1-3 situation what matter is it if we are now getting 1-2.8 as we need 1-2 to break even.

Many players use blockers and fail constantly and then state they have no real value because they do not know the above concept.

A blocker is a card in your hand that reduces the probability, or makes it impossible, for an opponent to have specific hands, as they cannot hold the same card. Often called "card removal," this concept helps you analyze opponents' ranges—if you hold the A of heart on a three-heart board, for instance, you know they cannot hold the nut flush.

Thanks for all the replys. I understand it now. It doesn't actually block it just reduces the probability they have a certain card.

It's when your hand blocks the possibilities

every time you play a hand, ask yourself what strong hands your opponent might have and what cards in your hand reduce those options.

SJP_1964 said:

Thanks for all the replys. I understand it now. It doesn't actually block it just reduces the probability they have a certain card.

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Depends on the situation. If you have on , then its literally impossible for anyone else to have 3 of a kind. In fact they cant have much at all except the small boat, and for that reason this is a situation, where you normally want to slowplay to allow your opponent(s) to catch up or bluff.
If you have on , then your opponents can have many hands, that beat you, but they cant have an A high flush, which is the nuts, because you block it. And for that reason it might sometimes be a good play to turn your hand into a bluff by putting in a big raise instead of calling.