Boosted Poker
Full Texas Hold'em Flush Rules
A flush is five cards of the same suit. In Texas Hold'em that's the simple part — the harder questions are about tiebreakers, board flushes, and what happens when there's a four-flush on the table. This guide covers the full rules: what counts, how to compare two flushes, what beats them, the misconceptions that lose players pots, and the variant rules that change how flushes work entirely.
The Short Definition
A flush is any five cards of the same suit (♠ ♥ ♦ ♣). All five must share the suit; their ranks don't matter for the hand to qualify. If the five cards also happen to be in sequence (like 9-8-7-6-5 all hearts), you've made a stronger hand — a straight flush. If those five sequential same-suit cards are A-K-Q-J-10, that's the strongest hand in poker: a royal flush.
In Texas Hold'em specifically, you have access to 7 cards (your 2 hole cards plus 5 community cards) and pick the best 5-card hand from those. So a flush in Hold'em means at least 5 of your 7 available cards share a suit.
Where the Flush Ranks
Flushes sit in the upper-middle of the poker hand rankings. From strongest to weakest, the full order is:
- Royal Flush (A-K-Q-J-10 same suit)
- Straight Flush (5 sequential, same suit)
- Four of a Kind
- Full House
- Flush
- Straight
- Three of a Kind
- Two Pair
- One Pair
- High Card
A flush beats a straight but loses to a full house. That difference — flush vs. full house — is the most common point of confusion at the table, and the one that costs new players the most money.
Flush Tiebreakers: Card-by-Card, Highest First
When two players both have a flush, the winner is decided by ranks, not suits. Compare the five cards of each flush in descending order:
- Highest card → if tied, go to the next.
- Second-highest card → if tied, continue.
- Repeat through all five cards.
- If all five ranks are identical, the pot is split.
Worked example:
| Player A's Flush | Player B's Flush | Winner |
|---|---|---|
| A♥ K♥ 9♥ 6♥ 4♥ | A♠ K♠ 9♠ 6♠ 2♠ | A wins (top 4 cards tie; A's 4 beats B's 2) |
| K♣ J♣ 8♣ 5♣ 3♣ | A♦ 9♦ 8♦ 6♦ 2♦ | B wins (Ace-high flush beats King-high) |
| A♣ Q♣ 10♣ 7♣ 2♣ | A♥ Q♥ 10♥ 7♥ 2♥ | Split pot (identical ranks; suits don't matter) |
The "Does Suit Matter?" Myth
The single most common flush misconception: that spades beat hearts, or hearts beat diamonds, etc. In standard Texas Hold'em, suits have no inherent rank. They're tracked only to determine which cards form a flush in the first place. Once two players each have a flush, only the card ranks matter.
This rule comes from bridge and some draw poker variants — but those games used the spade-heart-diamond-club hierarchy. Texas Hold'em does not. If two players tie down to the last card, they split the pot. Period.
Board Flushes: When the Community Cards Are All One Suit
If all 5 community cards share a suit, anyone still in the hand technically has a flush — they can "play the board." But that's almost never the actual winner. Whoever has the highest hole card of that suit makes a better flush by replacing the lowest community card with their hole card.
Example: Board is K♠ 9♠ 7♠ 4♠ 2♠.
- Player A holds A♠ 5♦ — uses A♠ + K♠ 9♠ 7♠ 4♠ for an Ace-high spade flush.
- Player B holds Q♠ 8♥ — uses Q♠ + K♠ 9♠ 7♠ 4♠ for a Queen-high spade flush.
- Player C holds 6♣ 5♣ — plays the board: K♠ 9♠ 7♠ 4♠ 2♠ (King-high flush).
Player A wins. The lesson: an Ace of the board's suit is gold when there's a flush board — it freezes you into nut-flush territory if someone hits.
What Beats a Flush
Three hands beat a flush, in increasing strength:
- Full house — three of a kind plus a pair. The most common flush-killer.
- Four of a kind — extremely rare against a single flush, but mathematically possible.
- Straight flush / royal flush — your flush is a straight flush, but a higher one beats it.
The danger sign at a flush board: the board pairs. If you've made a flush and the river pairs a board card, suddenly anyone with that paired rank in their hand has a full house and beats you.
Flush Probabilities in Texas Hold'em
- Chance of being dealt two suited hole cards: ~23.5% (any hand with both cards the same suit).
- Chance of flopping a flush with two suited hole cards: ~0.84%.
- Chance of flopping a flush draw (4 to the flush) with suited hole cards: ~10.9%.
- Chance of completing a flush draw by the river (with two cards to come): ~35%.
- Chance of completing a flush draw on the river (with one card to come): ~19.6%.
That last number is the classic "rule of 4 and 2" — multiply your outs by 4 with two cards to come, by 2 with one card to come. A flush draw has 9 outs (13 cards in a suit minus 4 you already see), so 9×2 = 18%, very close to the real 19.6%.
Common Flush Mistakes
Chasing without odds
A flush draw needs about 4:1 pot odds to call profitably on the turn. If the pot is offering you 2:1, you're losing money in the long run no matter how often you hit. Math beats hope.
Playing weak suited holdings preflop
"They're suited!" is the rallying cry of losing players. Cards like 7♠ 3♠ make a flush about 0.84% of the time on the flop. Most of the time you just have 7-3 — a terrible hand. Suitedness adds value but doesn't redeem a bad hand.
Forgetting the board can pair
If your flush is made on the turn and the board pairs on the river, your hand is dramatically less safe. Adjust your bet sizing accordingly.
Assuming spades beat hearts
Already covered, but worth repeating. There is no suit hierarchy in Texas Hold'em. Two equal flushes always split.
Variant Flush Rules: When the Game Changes
Standard flush rules are clean, but several poker variants tweak them for fun. The two most common variant flush rules — both of which appear in Boosted Poker as random per-hand table modifiers — are:
Four-Card Flush
In this variant, you only need 4 cards of the same suit instead of 5 to make a flush. The remaining card becomes a kicker, and tiebreaks work by comparing the 4 flush cards first, then the kicker:
10♥ 9♥ 8♥ 7♥ + 2♠ beats 6♥ 5♥ 4♥ 3♥ + A♠ — the flush portion is compared first (10-high beats 6-high), so the higher flush wins even though the second hand has a better kicker.
The change is enormous: flushes become roughly 3–4× more common in any hand where this rule is in effect. Suited connectors and even disconnected suited hands become much more playable.
Flush Beats Full House
For this hand only, flushes outrank full houses. The rest of the rankings stay the same. This single change flips a lot of conventional wisdom: a board that looked safe with a paired flop becomes dangerous, and players who would have folded flush draws against full-house-likely boards become correct to call.
Side-by-Side: Standard vs. Boosted Poker Flush Rules
| Question | Standard Hold'em | Boosted Poker (with variant) |
|---|---|---|
| How many cards needed for a flush? | 5 same suit | 4 same suit (when Four-Card Flush modifier is active) |
| Does a flush beat a full house? | No | Yes (when Flush Rules modifier is active) |
| Suit hierarchy? | None | None (same as standard) |
| Tiebreaker? | Card-by-card descending | Card-by-card descending |
| Frequency in a typical session? | Flushes are uncommon | Significantly more common when the modifier is active |
Boosted Poker only applies these variant rules when their corresponding modifier is randomly drawn for a hand — the rest of the time, standard Hold'em flush rules apply. That means strategy adapts each hand based on which modifier is in effect.
Frequently Asked Questions
What is a flush in Texas Hold'em?
Five cards of the same suit. The cards don't need to be in sequence — if they are, it's a straight flush (a stronger hand). Suits are ♠ ♥ ♦ ♣ and have no inherent rank order.
Does the suit matter when comparing two flushes?
No. Standard Texas Hold'em has no suit hierarchy. Two flushes are compared by their cards' ranks only, starting with the highest card and working down. If all five cards tie in rank, the pot is split.
What beats a flush in Texas Hold'em?
A full house, four of a kind, straight flush, and royal flush. A flush beats a straight, three of a kind, two pair, one pair, and high card.
How do flush tiebreakers work?
Compare each flush's five cards in descending order. The higher top card wins; if tied, go to the second-highest; continue until you find a difference. If all five cards are identical, the pot splits. Suit is never used to break the tie.
Can the board itself be a flush in Hold'em?
Yes. If all 5 community cards share a suit, every remaining player has a flush by default. The winner is whoever has the highest card of that suit in their hole cards. If no one has a hole card higher than the lowest community card of that suit, the players involved split the pot.
Can you make a flush with 4 cards instead of 5?
Not in standard Texas Hold'em — a flush requires 5 cards of the same suit. Some variants, including Boosted Poker's Four-Card Flush table modifier, allow 4-card flushes for a single hand. When that rule is active, flushes appear roughly 3–4× more often.
What's the difference between a flush, straight flush, and royal flush?
A flush is 5 same-suit cards in any order. A straight flush is 5 same-suit cards in sequential order (like 8-7-6-5-4 of clubs). A royal flush is the highest possible straight flush: A-K-Q-J-10 of one suit.
How often will I make a flush in a typical Hold'em hand?
If you start with two suited hole cards, you'll make a flush by the river about 6.4% of the time. Across all starting hands, that drops to about 3.0% of hands ending in a flush at showdown. Variant rules like Four-Card Flush change this dramatically.