According to Omaha Poker Rules, there are four betting rounds in a complete game – exactly the same as in Texas Holdem Poker. In Omaha Holden, the dealer deals each player their own four private cards face-down.
Each bet on the first two rounds of betting is set at the lower limit of the stakes structure. For example in a $5/$10 game, all bets and raises are $5 for the first two rounds (after private cards are dealt and once the flop is spread in center of table).
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The last two rounds of betting (turn card and river) are set at the higher limit of the stakes structure. For example in a $5/$10 game, all bets and raises are $10 for the last two rounds.
One bet plus three raises (four total bets) are the maximum amount of bets allowed per betting round. This would consist of (1) a bet, (2) a raise, (3) a re-raise, and (4) a cap. The term cap is used to describe the 3rd raise in a round since betting is then capped and cannot be raised anymore. Once any player has made the third raise (capped the pot), then players will have only the option of calling or folding.
Check-raising is allowed in all online poker games.