The PLO Suit Premium: Double-Suited vs Rainbow
In Pot-Limit Omaha the second suit is worth more than any single card. From the Button, unpaired double-suited hands open 80.7% of the time; the exact same ranks rainbow open just 22.1% — about 3.7 times less often.
| Position | Double-suited | Single-suited | Rainbow |
|---|---|---|---|
| Button | 80.7% | 43.3% | 22.1% |
| Cutoff | 58.8% | 23.8% | 8.7% |
| Small Blind | 50.2% | 25.1% | 10.9% |
| Hijack | 47.4% | 15.4% | 3.1% |
Source: PLO+ solved ranges, 100bb 6-max cash.
The gap is not small and it is not noise. Across every position, double-suited hands open two to four times more often than the same ranks rainbow. The reason is backdoor flush equity: a four-card hand with two suits makes flushes and flush draws constantly, and in a game where equities run close, that extra equity is the difference between a profitable open and a fold.
Single-suited hands sit in between, closer to rainbow than to double-suited. One suit is a modest bonus; two suits is a category change. This is why experienced PLO players talk about hands as "double-suited" first and by rank second.
The practical rule: upgrade your read of any four cards by their suit structure before their rank. A mediocre-looking rundown that is double-suited outperforms a prettier-looking rainbow holding, and the solver opens it far more often.
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