It looks like a slot. It sits with the slots. It's nothing like a slot. The deal is a genuinely random 52-card deck, the paytable is printed on the glass, and from those two facts anyone with a calculator can work out exactly what the machine returns. The casino's only defence is that almost nobody bothers.
Bet one to five coins (always five — see quirks). You're dealt five cards, you hold any you like, the rest are replaced once, and you're paid according to the final hand against a fixed paytable. No dealer, no opponent, no bluffing. Jacks or Better is the base game: a pair of jacks or higher gets your money back, two pair pays 2:1, and so on up to a royal flush at 800:1 (with five coins in). Variants change which hands pay what — Deuces Wild makes every 2 a wild card, Double Bonus pays big for four of a kind — and each variant has its own optimal strategy.
Because the deck is fair and the paytable is public, there's a mathematically perfect way to play every hand, and the return of the machine under that strategy is a known number. That's what "9/6" means: a Jacks or Better game paying 9 coins for a full house and 6 for a flush returns 99.54% with perfect play. Drop the flush to 5 (an "8/5" game) and the same machine returns 97.30%. Same screen, same sounds, five times the house edge.
| Game / paytable (optimal play, 5 coins) | Return | House edge |
|---|---|---|
| Full-pay Deuces Wild | 100.76% | −0.76% (player edge) |
| 10/7 Double Bonus | 100.17% | −0.17% (player edge) |
| Jacks or Better 9/6 | 99.54% | 0.46% |
| Double Double Bonus 9/6 | 98.98% | 1.02% |
| Jacks or Better 9/5 | 98.45% | 1.55% |
| Jacks or Better 8/5 | 97.30% | 2.70% |
| Jacks or Better 7/5 | 96.15% | 3.85% |
| Jacks or Better 6/5 | 95.00% | 5.00% |
| Any of the above, played by guesswork | 2–4% lower | +2–4% |
Pick a bet, a unit and a number of bets. The simulator plays 1,000 sessions from the bet's actual outcome table — not a normal approximation — and shows the spread, the drawdowns, and how long it takes before the house edge stops hiding behind luck. The same 500 hands on a 9/6 machine and an 8/5 machine, side by side, is the most persuasive argument on this page. Try both.
How it works. Video poker advantage play is arithmetic, not sleight of hand. You find a paytable at or above 100% (rare now, but they exist off-Strip and in locals' rooms), play it perfectly, and layer the player's-club cash-back, multiplied-point promotions and mailer offers on top. A 99.54% game with 0.33% cash-back and a double-points day is a winning proposition. The second angle is progressive jackpots: a royal flush meter that has climbed high enough pushes an ordinary 8/5 machine over 100%, and pros sit on it until it hits. The third is strategy changes for the meter — as the royal grows you draw to it more aggressively, and the right adjustments are published.
Legality. Completely legal. You're using the machine exactly as designed and reading numbers the casino printed. Strategy cards at the machine are allowed everywhere.
Acceptance. The most tolerated form of advantage play in the building, because the edges are tiny and the players are reliable, high-volume customers. The pushback is quieter: the best paytables get removed, video poker earns fewer points than slots, and the players who visibly grind promotions can find their mailers stop arriving. Nobody gets trespassed for playing 9/6 Jacks correctly. For most people the realistic prize isn't a living, it's turning a ~2% hobby into a ~0% hobby with a free buffet.