PLO4 vs PLO5: What the Fifth Card Changes
The adjustments every 4-card player has to make
Most people who sit down at a 5-card Omaha table already know 4-card PLO. That background is useful — the betting structure, the "exactly two from your hand" rule and most strategic concepts carry over. But the fifth card quietly shifts almost every threshold in the game, and players who simply copy their 4-card habits tend to overplay their hands before and after the flop.
This article summarises the most important differences. Each point is covered in depth in its own guide.
1. Everyone has more of everything
With five cards you hold ten two-card combinations instead of six. That means more straight draws, more flush draws, more two pairs and more sets — for you and for your opponents. Almost half of all starting hands (46.8%) are double-suited, compared to roughly 14% in 4-card PLO, and almost one hand in four contains an ace with a second card of its suit.
The practical consequence: a draw or made hand that is "good" in 4-card PLO is often only second-best in 5-card PLO. When your opponent continues, he is far more likely to hold a better version of what you have. See PLO5 by the Numbers for the exact probabilities.
2. Nuttiness matters more than raw equity
Preflop equities between two random-looking hands are closer in PLO5, and many players conclude that "anything can win". That conclusion is wrong. The big pots are decided by domination: nut flush against king-high flush, top wrap against bottom wrap, top set against middle set. The fifth card makes these collisions more frequent, so the value of drawing to the nuts goes up and the value of non-nut draws goes down. Read Domination and Nuttiness for the full argument.
3. Pairs, especially kings, lose value
Aces are still the best pair, but their equity edge shrinks because opponents have more ways to outdraw them. Kings suffer even more: with roughly 4% of all hands containing a pair of aces, a king-high suit is dominated far more often and many double-suited king hands that would happily 3-bet in 4-card PLO are just calls — or folds — in PLO5. Double-paired hands without strong side cards are frequent folds. See Kings, Queens, Jacks and Tens.
4. The ace-high suit is worth much more
In 4-card PLO a king-high flush draw is usually a strong asset. In PLO5, because double-suited hands are so common, the gap between the nut suit and every other suit becomes enormous. A hand with an ace suited to one of its cards gains a lot of value; a hand whose suits are king-high or lower needs extra connectivity or high cards to compensate.
5. Suit structure is more nuanced
Five cards allow suit structures that do not exist in 4-card PLO, such as double-triple-suited (three cards of one suit and two of another) and quad-suited hands. A third or fourth card of a suit blocks your own flush outs and reduces playability, so these hands play much more passively than their pure double-suited versions. See Suits, Gaps and Danglers.
6. Preflop frequencies are surprisingly similar
A common mistake is to assume that more equity means you should play far more hands. In solver-based studies at 100 big blinds, raise-first-in frequencies by position are very close to 4-card PLO (roughly 17–18% under the gun up to just under 50% on the button). What changes is the composition of those ranges and how you respond to aggression:
- You fold much less to 3-bets. An early position opener facing a 3-bet folds only around one hand in ten, compared to roughly a third of hands in 4-card PLO.
- You cold call a bit more and 3-bet a bit less. Hands have enough equity to see a flop, but there is less fold equity preflop, so 3-betting light is less attractive.
- The big blind defends slightly wider but 3-bets tighter.
7. The out-of-position player bets more
Five hole cards give you more information about what your opponent cannot have. When you connect strongly with a board, you remove a large part of the hands your opponent would bet with, so waiting for a check-raise often means nobody bets at all. As a result, leading into the preflop raiser and betting out of position as the aggressor are much more common in PLO5 than in 4-card PLO. See Leading the Flop.
8. Stack-off thresholds are higher
Hands that are automatic stack-offs in 4-card PLO — an overpair with a non-nut flush draw at a low stack-to-pot ratio, or top two pair on a draw-heavy board — are often only check-calls or even folds in PLO5. Your opponent's continuing range simply has more equity against you. See 3-Bet Pots and Stack-Off Thresholds.
9. Players bluff less on later streets
Finding bluffs requires reaching the river with hands that missed and still have blockers. In a game where most players are still learning, that skill is rare, and many opponents also assume "he always has it" in five-card games. The result is a population that under-bluffs big rivers and over-folds to aggression. Hero calls are less profitable than in 4-card PLO, while well-chosen bluffs work more often. See Bluff-Catching on the River.
The one-sentence summary: keep your 4-card frequencies, but raise the quality bar for every hand that wants to build a big pot — before and after the flop.
Frequencies on this site are approximate values from 100 big blind, 6-max solver studies with typical online rake. Your rake, stack depth and opponents will shift them; use them as a baseline, not as exact targets.