Omaha hold 'em (or Omaha holdem or simply Omaha) is a community card poker game ("flop game") similar to Texas hold 'em, where each player is dealt four cards and must make his best hand using exactly two of them, plus exactly three of the five community cards.
Explanation
In North American casinos, the unadorned term "Omaha" can refer to several games. Typically, it refers to the high-low split variant played with fixed limits: also called "Omaha eight-or-better," "Omaha Hi-Lo," "Omaha/8" and several other similar names. The original game is more commonly known as "Omaha High Only."
In Europe, "Omaha" still typically refers to the high version of the game, usually played pot limit. Pot Limit Omaha is often abbreviated as "PLO." Pot-limit and no-limit Omaha eight-or-better can be found in some casinos and online, though no-limit is more rare.
Low Limit Omaha - Strategy and starting hands for low limit games, including play on all betting rounds.
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Omaha Poker Articles - High-Low strategy from Russ Fox, and Edward Hutchison's point count systems for High-Low and High-only games.
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Bet24 Poker Tips 02 - Omaha Hold'em Basics By Theo Jørgense