Omaha is not necessarily a high-low split game; you can play it as a high-only game, too. You'll find Omaha played as a high-only game in some casinos, although it is not nearly as popular as its Hi-Lo cousin.
Omaha Hi is often played pot-limit in card rooms. Betting can escalate extremely quickly in these games, and the last thing we'd ever advise a beginning player is to play pot-limit or no-limit Poker.
Much of the time, Omaha Hi makes an appearance during a major Poker tournament—the kind that takes place over a week or longer—and the game is usually played as pot-limit.
Omaha Hi is very popular in European card rooms, but in England, Ireland, and much of continental Europe, pot-limit games are the rule rather than the exception.
The mechanics of Omaha-Hi are identical to those of Omaha Hi-Lo. Each player receives four cards in his starting hand. After a round of betting, three communal cards are flopped. A betting round, a fourth communal card, and another round of betting follows. Then a fifth community card is placed on the board. A final betting round follows and the best five-card hand wins the pot. As in Omaha Hi-Lo, a player must use precisely two cards from his/ her hand and combine them with three of the community cards to form the best poker hand.
So far so good. Everything looks the same. But if you play Omaha Hi, you can expect some major differences in strategy:
In Omaha, you can have as many as 20 opportunities to make a straight. If you began with J-10-7-6 and the flop was 9-8-3, you'd make a straight with a queen, jack, 10,7,6,or 5. Four of those cards are in your hand, but with two more board cards to be dealt, you can expect to complete a straight more than 70 percent of the time. By comparison, in Hold'em, the maximum number of cards you can have that will complete your straight is eight.
Big Flushes: If you're going to make a flush, you may as well think big. There's nothing more frustrating than making a flush and losing to a bigger one. For obvious reasons, you'd much rather make a straight with a hand like 9-8-7-6 than a flush.1
1. Reprinted with permission, from "Poker for Dummies", by Lou Krieger and Richard D. Harroch, IDG Books Worldwide, Inc. ©2000