River Block Bets
Small bets out of position that set your own price
A block bet is a small bet, usually a quarter of the pot or less, made out of position on the river. It sets the price of the showdown yourself instead of letting your opponent bet bigger. Few players use it well, and in PLO5 it is one of the most profitable tools available to the out-of-position player.
Where block bets work best
The classic spot is the river after the flop and turn checked through. When the in-position player checks back twice, he removes most of his strong hands — he would have bet sets, two pairs and strong draws. The out-of-position player still has some strong hands that were waiting to check-raise. On the river, the out-of-position player therefore usually has a range advantage, especially when the river card does not introduce new nut hands.
How thin can you block?
In 4-card PLO, the out-of-position player in a check-check-bet spot can bet small with hands that have roughly 50% equity against the in-position player's whole checked-back range — sometimes as weak as second pair. PLO5 is similar in structure, but absolute hand strength is higher, so the threshold moves up: on a board where two pair is possible, a hand like second and third pair can be a thin block bet.
To estimate the threshold on a specific river:
- Start with your opponent's preflop range.
- Remove the value hands he would have bet on the flop or turn.
- Find the weakest hand of yours that still has more than about 50% equity against what remains.
You don't need to do this for every board. Boards fall into a few families (dry, one straight possible, several straights, flush completed), and the threshold is similar within each family.
Why small?
- It gets called by worse. Weak pairs and missed draws with some showdown value will call a quarter-pot bet but fold to a large one.
- It prevents a bigger bet. If you check, your opponent can bet larger with his strong hands and bluffs, putting you in a tougher spot.
- Raises are rare. Many players fear getting bluff-raised. In practice, the in-position player's range is capped and very few players raise small bets light.
Choosing which hands to block-bet
Among hands near the threshold, prefer those that block your opponent's thin value or showdown hands less and that look like bluffs to him — for example hands holding a missed draw card. Holding the missed draw also makes your range look more bluff-heavy, which encourages calls.
Exploiting typical opponents
The theoretical threshold is a starting point. Against most players:
- They fold too much to small bets after checking back twice. Bluff more often with quarter-pot bets.
- They miss thin value themselves and check back hands like top pair weak kicker. That means your medium hands have more showdown value against their checks, so you can check and show down more of them rather than value betting very thin.
In short: block-bet your medium-strong hands, bluff small more often than you think, and check down your weakest showdown hands against players who don't bet thin.