Big O
Omaha Hi-Lo's bigger sibling: five hole cards instead of four, still using exactly two at showdown, split between the best high and best qualifying low hand.
Coming soon — not yet playable
Rules
Big O deals like Omaha Hi-Lo, but each player receives five hole cards instead of four. A round of betting follows the initial deal, exactly like Hold'em/Omaha preflop.
Flop, turn, river: three community cards, then one more, then one more, each followed by a betting round — identical structure to Omaha.
Showdown: each player must use exactly two of their five hole cards (no more, no fewer) combined with exactly three of the five community cards to make their best high hand, and separately their best qualifying low hand (typically 8-or-better, Ace-to-Five low, same as Omaha Hi-Lo). The pot is split evenly between the best high hand and the best qualifying low hand; if no hand qualifies for low, the best high hand takes the entire pot.
Strategy notes: With five hole cards instead of four, there are far more possible two-card combinations to choose from, which pushes average hand strength up noticeably compared to Omaha Hi-Lo — strong low-oriented starting hands (multiple low, coordinated cards) become even more valuable since they're more likely to scoop both halves of the pot.
Common house rules
No qualifier Big O
As with Omaha Hi-Lo, some tables drop the 8-or-better qualifier so the low side always pays out regardless of how high the cards are, making low-hand play far more aggressive.
High-only Big O
A simpler house variant plays Big O for high hand only (no low split at all), essentially treating it as 'five-card-hole Omaha' for players not ready for the full hi-lo complexity.
Five hole cards, still exactly two used
Worth stating explicitly at a mixed table: like Omaha, exactly two (not more, not fewer) of the five hole cards must be used for both the high and low hands, and the two used for high need not be the same two used for low.
Related games
Based on shared category, origin, and rules that reference each other.
Omaha Hi-Lo
A community-card game related to hold'em: four hole cards, five community cards, and the pot splits between the best high hand and the best qualifying low hand.
Learn the rules →5-Card Omaha
Omaha with five hole cards instead of four, played high-only — the high-hand-only counterpart to Big O, which adds a low split to the same five-card format.
Learn the rules →Omaha
Community-card poker like Hold'em, but with four hole cards instead of two — high hand only, no low split, and exactly two hole cards must be used at showdown.
Learn the rules →Archie
A five-card triple-draw hi-lo split game requiring a genuine qualifying hand on both the high and low sides, popularized on the Las Vegas mixed-game scene.
Learn the rules →