A Guide to Block Betting the River

Today, we explore a sophisticated tool in the No Limit Hold’em arsenal: the ability to make small river bets with the right range at the right time,the river block bet.

While many small-stakes players stick to rigid, “textbook” bet-sizes like 50% or 66% pot, mastering the 20%-33% sizing can significantly increase your win rate. This strategy isn’t just about betting small. It’s about controlling the action and manipulating your opponent’s calling range.

What Does Block Betting Achieve?

Making a small bet on the river is generally a play that seeks to achieve two aims:

• You set yourself a good price against Villain’s range where your hand is quite marginal but can easily be best. This way you might avoid having to call a bigger bet that you might face if you check.
• You force Villain to call some weaker hands, meaning that you do not need such a strong hand to bet for value. This is known as thin value betting.

Building a River Block Bet Range

The above aims mean that the most common hand that features in a block bet range is going to be a mediocre one since the block bet strategy is mainly created to accommodate this sort of hand. However, there are other types of hands that make an appearance in a properly balanced strategy. Before listing the hand-types that might use this bet, let’s map out a common situation in which the river block bet is a lucrative option.

Preflop & Flop

Hero is in the BB and calls a 2.5bb open from the CO, who is a solid regular. The flop comes down: J♥4♠2♣. Hero checks and Villain bets one third of the pot. Hero calls.

Turn

The turn is the A♥ and both players check.

River & Range Analysis

On the 8♠ river, you will arrive with some Jx, a chunk of Ax, and some occasional air hands like Q♣10♣, which floated the flop with backdoor draws. You will also have some small to medium pocket pairs and some 2x and 4x. Villain might have some weaker Ax, but after his turn check, top pair is much more likely in your range than his. One important point is that your opponent’s range is capped so he will be unable to raise your block bet here unless he has rivered something like two-pair or a set of eights. This improves the expected value of the play as you do not end up bet/folding the best hand very often.

Here are some hands that might want to block bet this river for 30% pot:

Good Jx such as QJ and KJ: These hands can extract some very thin value from weaker Jx, 8x, underpairs, and who knows, maybe a stubborn 4x or 2x from time to time (though these hands are not normally in Villain’s range from pre-flop). Villain will usually not raise with a weak Ax here and would have bet most strong Ax on the turn. Consequently, you get to limit the amount you lose to better hands while also getting value from worse hands.

Ax hands: With weaker Ax, a small bet will work just fine. If you hold A3 here, you are only targeting Jx and worse for value and so a small bet will be fairly appropriate, cutting back how much you lose to a hand like A9, which will surely bet large if you check again.

A big board crusher like AJo: A hand like this makes it harder for Villain to hold a strong enough bluff catcher to call a large bet. By holding an Ace and a Jack, you reduce the combinations of Ax and Jx in your opponent’s range, causing him to hold a very weak hand more often. Therefore, a small bet might maximise value vs. this range and induce a bluff raise sometimes from weak holdings.

A Bluff: Hands like 10♠9♠ need to bet to fold out all sorts of garbage that is currently beating them at showdown. Using a small bet with these hands might seem counterintuitive since fold equity is what you desire, but remember: the less you risk, the less fold equity you need on a bluff. These hands are not expecting to fold out a Jack, but they will often get folds from Queen High, King High and trashy pairs. This part of the block-bet range is needed for long-term balance. If you never bluffed here, Villain would never have to pay you off when you were value betting.

For example, if a heart flush draw missed on the river, you would prefer to bluff with a hand that does not contain a heart. This increases the chance that Villain is holding those missed draws and will fold even to a 30% pot bet, which is exactly what we want from our bluffing range.

In summary, this spot offers a lot of opportunities for block bets with a variety of holdings. Note that it would be wrong to block bet a hand like 88 here. Such a hand does not block Jx or Ax at all and these hands are likely calling a bigger bet. You should size up with 88 to target them and of course balance this with some bluffs that also use a bigger sizing.

Exploitative Block Betting

There are times when you can consider block betting the river for more exploitative reasons. Look out for the following:

• You have a marginal value betting hand in a spot where many of Villain’s draws have missed and he is an overly aggressive player-type. A block bet here is likely to induce bluff raises.
• Villain is a tight player, you have a good hand, and the board has become very bad for Villain’s range and very good for yours. EG. Lots of high cards came on the turn and the river after he called pre-flop and called a bet on a low flop. For example, 774QK. Villain will fold too often to a big bet here.
• You think that Villain perceives small bets as strong. If he folds too much to 30% pot bet-sizes because he wants to make a soul read that he is ‘being milked’ then this is a great opportunity to make cheap bluffs with high success rates. Such a read is especially likely live or at a home game with friends whom you know well. It may be hard to know that an opponent thinks this way online.

Conclusion

Look out for opportunities to use strategically solid block bet ranges, but also keep your eyes open for times when a smaller bet might serve some profitable exploitative role on the river.