High Card Flush strategy

High Card Flush is a carnival game played with one deck. You and the dealer each get seven cards, and the only thing that matters is your longest flush: the most cards you hold in one suit. Pairs, straights and full houses mean nothing here. After you look, you either fold or raise, and the size of the raise you’re allowed grows with the length of your flush. That one decision is the whole game, and getting it right is worth a lot. Raise too often and the dealer’s qualifying hands bury you; fold too often and you throw away antes you could have won.

How to play

1. Place an Ante bet. You can also add the optional Flush and Straight Flush side bets.
2. You and the dealer each receive seven cards. Only you look at yours.
3. Find your longest flush. If two suits tie for length, the one with the higher cards counts.
4. Fold (you lose the ante) or raise. The raise limit depends on your flush:
   • 2-, 3- or 4-card flush: raise 1× the ante.
   • 5-card flush: raise up to 2×.
   • 6- or 7-card flush: raise up to 3×.
5. The dealer reveals. The dealer qualifies with a three-card flush, 9-high or better.
6. If the dealer doesn’t qualify, your ante pays 1:1 and your raise pushes.
7. If the dealer qualifies, the better hand wins. A longer flush always beats a shorter one. Equal lengths compare the flush cards from the top down. Winning pays the ante and raise 1:1; a tie pushes both.
8. Side bets are paid on your own seven cards, win or lose against the dealer.

Example: you hold K♥ 9♥ 4♥ 2♥ and three off-suit cards. That’s a 4-card heart flush, king high. The dealer shows Q♠ J♠ 7♠ 3♠ 2♠, a 5-card spade flush. The dealer qualifies and the longer flush wins, so you lose the ante and the raise.

Payouts

The ante and raise both pay even money. The side bets pay by flush length.

Main game

Flush side bet

Two common paytables:

Both edges are exact, computed by counting every suit distribution of a seven-card hand.

Straight Flush side bet

Strategy

No complete optimal strategy has ever been published for High Card Flush, per Wizard of Odds analysis. But a near-optimal rule from Charles Mousseau comes very close, and it’s easy to remember:

Raise the maximum with any 4+ card flush, or a 3-card flush of T-8-6 or better. Fold everything else.

Reading a 3-card flush against T-8-6

Compare your three flush cards to T-8-6 one card at a time, from the top:

• Top card J or higher: raise. J-4-2 suited beats T-8-6 on the first card.
• Top card 9 or lower: fold. The best 9-high flush, 9-8-7, is still below T-8-6.
• Top card is a 10: look at the second card. T-9-anything raises. T-7-anything folds. With T-8, the third card decides: T-8-6 and T-8-7 raise, T-8-5 and lower fold.

So 10♦ 8♦ 6♦ is a raise, while 10♦ 8♦ 5♦ is a fold. The difference is small, but the line has to fall somewhere.

Wizard of Odds’ own partial analysis agrees with the edges of this rule: three-card flushes of J-9-6 or better should raise, and 9-7-4 or worse should fold. The hands in between are close calls, and T-8-6 splits them well. Mousseau’s rule produces a house edge of about 2.71% of the ante. The best published strategies (Gordon Michaels’ advanced strategy at 2.69%, and a partially optimal one at 2.64%) save only a few hundredths of a percent.

Always raise the maximum

Bigger raises are only allowed with 5+ card flushes, and those hands beat a qualifying dealer far more often than they lose. The EV grows in step with the raise, so every extra unit adds value. With a 5-card flush, raise 2×, never 1×. With a 6- or 7-card flush, raise 3×. There is no situation where raising less than the maximum is the best play.

Why weak 3-card flushes fold

A qualifying dealer always has at least a three-card flush. If you raise with 9♣ 6♣ 3♣, you only win when the dealer misses or holds an even weaker three-card flush. You pay the full raise every time the dealer has something better. And with seven cards, many dealers have four or more suited cards.

Common mistakes

• Raising weak 3-card flushes. Anything below T-8-6, and especially 9-high and lower, should fold. Raising 9-8-7 suited costs roughly 0.16 antes each time, per the trainer’s simulation.
• Raising a 2-card flush. It can never beat a qualifying dealer. You’re betting only on the dealer missing.
• Raising less than the maximum. Raising 1× with a 5-card flush, or 2× with a 6-card flush, leaves money on the table.
• Folding a 4-card flush. Every 4-card flush is a raise, even a low one like 8-6-4-2 suited.
• Playing the side bets. At 7.5% to 13.1% they cost several times more per dollar than the ante game.

House edge explained

With the T-8-6 strategy, the house keeps about 2.6% to 2.7% of the ante. Published figures range from 2.64% to 2.71% depending on how refined the strategy is, and Casino Coach’s own 500,000-hand simulation of the T-8-6 rule measured 2.61%, within noise of the published numbers.

The edge comes from three places:

• Folding costs you the ante. On weak hands that’s the cheapest option, but it’s still a loss.
• The dealer acts last. You must commit your raise before you see the dealer’s hand.
• The qualifier works against strong raises. When the dealer doesn’t qualify, your raise only pushes. You get paid on the ante, not the extra money you put out.

Best bet: the ante with correct raise-or-fold play. Worst bet: the Straight Flush side bet at 13.1%. Its 8,000-to-1 top award makes it very swingy, and it still loses far more than the main game over time.

Variations to look for: if you play the Flush side bet anyway, the 300/75/5/2 paytable (7.53%) is slightly better than 300/100/10/1 (7.81%). Neither comes close to the ante game.

Practice in Casino Coach

Casino Coach deals High Card Flush with one deck and the real raise limits and dealer qualifier. In Trainer mode, every fold or raise is graded against the T-8-6 rule. When you miss, you see the correct play and a Monte Carlo EV of folding versus raising each amount, simulated over thousands of dealer hands. You can also block wrong plays until you correct them. Three drills build the skill: Raise or fold? focuses on the close 3-card hands around T-8-6, Who wins? has you compare flushes and check the dealer qualifier, and Side bet payouts tests the Flush and Straight Flush paytables. Analytics tracks your accuracy, your EV lost to mistakes and your results against expectation. Chips are free and have no cash value, so train as many hands as you like.

Updated October 24, 2026