Bluff-Catching on the River

Why hero calls are less profitable in PLO5 than you think

Bluff-catching — calling a river bet with a hand that only beats bluffs — is where many players lose the money they won earlier. In PLO5, river calls are on average less profitable than in 4-card PLO. Understanding why, and how to choose the few good bluff-catchers, will save you a lot of big blinds.

Why players bluff the river less in PLO5

• To bluff the river you need to arrive there with a hand that missed and still has blockers. That requires earlier-street skill that many players are still developing.
• Many players believe the bettor "always has it" in five-card games, so they assume bluffs don't work and rarely try them.
• With five cards, more hands make something by the river, so fewer pure air hands are available to bluff with.

The result: when an average opponent makes a big river bet, his range is usually value-heavy. A pot-sized bet only needs to be a bluff one time in three to make your call break even, and many players don't get there.

Choosing a bluff-catcher

If you do decide to call, pick the hand in your range that does best against your opponent's specific bluffs:

• Unblock his bluffs. If his bluffs are missed flush draws, a hand with no cards of that suit is a better bluff-catcher than one with two of them.
• Block his value. Holding cards that remove his value hands (a card that blocks the straight, a card that pairs a full house) makes it more likely he is bluffing.
• Prefer catchers with no other use. Hands that have decent value of their own often do better as checks behind or small value bets.

Counting combinations

A useful exercise is to count how your opponent gets to his value hand versus his bluff. Suppose the board makes a straight flush possible and your opponent raises your nut-flush bet on the river. For the straight flush he needs two specific cards. For a bluff, he needs only one of them as a blocker — and he has five cards with which to hold it. Combinatorially, a single blocker is much more likely than both cards. Against a player capable of a blocker bluff, calling with the nut flush can be correct even though it "only beats a bluff".

Board

Hand

The flip side: if your opponent is the type who never turns a hand into a bluff, it doesn't matter how few value combinations he has. He has them.

When calling is reasonable

• Your opponent took a line that plausibly contains many missed draws, such as a big bet on a river that completes nothing after he raised the flop.
• His sizing is small, so you need little equity.
• You have specific reads: he has shown river bluffs before, or plays very aggressively overall.
• You block his value and unblock his bluffs as described above.

When folding is reasonable

• Your opponent's line is consistent with value and his bluffs would need a hand he rarely gets to the river with.
• You hold the cards he would bluff with — for example the missed flush draw cards.
• He bet big on a river that completes a draw you don't block, after a passive earlier line.

Minimum defense frequency on the river

On the flop and turn, MDF is a good sanity check. On the river, especially out of position and after your opponent bet several streets, it breaks down. If his range is narrow and strong, you don't have to defend the theoretical frequency; folding a lot is correct against an opponent who doesn't bluff enough. In PLO5's current player pool, this is the default.