10 Casino Myths, Tested

Most casino myths come from the same place: our brains are built to find patterns, and games of chance produce plenty of patterns that mean nothing. We took ten things players commonly believe about blackjack, roulette and poker and checked each one, with simulations where a simulation could settle it. The short version: the cards and the wheel don't remember, don't care who's playing, and don't know what you bet.

Myth 1: After five blacks, red is due

Verdict: false. We spun a single-zero wheel 20 million times and looked at every spin that came right after five or more blacks in a row: more than half a million of them. Red came up 48.7% of the time. Its normal chance on any spin is 48.6%.

The wheel has no memory, so the next spin can't "balance" earlier ones. This is the gambler's fallacy, and it's the root of most of the myths below.

Myth 2: Some numbers are running hot

Verdict: false. In the same 20 million spins, we tracked every number that had come up three or more times in the last 37 spins, a "hot" number by any standard. Those numbers came up on the next spin 2.706% of the time. Any number's chance is 2.703%.

Hot and cold numbers on a roulette display describe the past accurately. They just don't predict anything.

Myth 3: A bad player at third base costs everyone money

Verdict: false. The idea: the last player to act before the dealer "takes the dealer's bust card" by hitting when they shouldn't.

We simulated a two-seat blackjack table for 3 million rounds twice. The first seat always played perfect basic strategy. In one run the last seat also played perfectly; in the other, it played terribly, standing on everything from 12 up. The first seat's result: -0.51% with a perfect neighbor, -0.45% with a terrible one. The difference is inside the simulation's margin of ±0.13 points.

A bad player's extra cards are just as likely to save the dealer as to bust them. Nobody remembers those hands, which is why the myth survives. More in multiplayer vs solo blackjack.

Myth 4: Insurance protects a good hand

Verdict: false. Insurance is a separate side bet that the dealer has blackjack, and it pays 2 to 1. In a 6-deck game the dealer has a 10 under the ace only about 31% of the time; you'd need 33.3% to break even. Over time insurance loses about 7.6% of what you put on it, and it's actually worst when you hold a 20, because your own cards took two 10s out of the shoe. The insurance math is short.

Myth 5: Card counting is illegal

Verdict: false. Counting is just remembering cards that were dealt face up. It's not illegal anywhere we know of, though casinos can ask a player to stop playing blackjack. What is banned in many places is using a device to count for you.

It's also not the jackpot people imagine: in our simulations a skilled counter gained well under 1% of what they bet, and only in games dealt deep into a shoe. Does card counting work online? explains why most online games make it impossible.

Myth 6: The game knows when you bet big

Verdict: false. In a fair game the cards are shuffled, or the winning number drawn, without any reference to who bet what. At House21 the blackjack shoe is shuffled before it's dealt, the poker deck before each hand, and the roulette number is drawn when betting closes, all from a cryptographically secure random source. Your big bet loses as often as your small ones; it just hurts more, so you remember it. Is online blackjack rigged? has the numbers to check.

Myth 7: A betting system can beat roulette

Verdict: false. We played six famous systems, including Martingale, Fibonacci and d'Alembert, for 100,000 sessions each. Some won a small target in over 90% of sessions. Every one still lost between 2.7% and 2.8% of all the chips it wagered, the same as flat betting. A system can change how wins and losses are spread out; it can't change the edge on each spin. Full results in roulette strategy, tested.

Myth 8: Pocket aces should always win, so a bad beat means the game is rigged

Verdict: false. Pocket aces are the best starting hand in hold'em, and they win about 85% of the time against a single random hand. That means they lose about once in seven. Play 100 pairs of aces heads-up and you should expect to see them cracked around 15 times. Against a suited connector like 8♥ 7♥, aces lose almost 1 time in 4.

A bad beat feels like proof of something. It's what 15% looks like.

Myth 9: Suited cards are much stronger

Verdict: mostly false. Being suited helps, but less than people think. We played each hand against 200,000 random opponents:

Suited 7-2 is still a hand to fold. The suit matters most for hands that are already close to playable, like suited connectors from late position. Our poker hand rankings cover the rest of the odds.

Myth 10: Free games are set to let you win

Verdict: false, at least here. The theory is that free casino games are generous so you'll get hooked, then switch to real money. At House21 the games use the same rules and the same math as a real casino: the dealer stands on 17, roulette has one zero, poker hands are ranked the usual way. We have no real-money games to switch you to and nothing to sell. If you win more than you expected on a good night, that's variance, not a gift. What is a social casino? explains how free casinos work.

Why these myths feel true

All ten have the same roots:

• We remember what stands out. A dealer bust after someone "took your card" is a story. The times it went the other way aren't.
• We expect randomness to look even. Real randomness is lumpy: a fresh run of five blacks in a row starts about once every 70 spins on a European wheel, so at one spin every half minute you'll see one roughly every 35 minutes.
• We like to feel in control. Patterns and systems promise control over something that's genuinely random. Why "one more hand" is hard to resist goes deeper.

How we tested

Roulette: 20 million spins of a single-zero wheel, checking every spin after 5+ blacks and every "hot" number (3+ hits in the previous 37 spins). Blackjack: a two-seat table with House21's rules, 3 million rounds per run, the first seat playing basic strategy throughout. Poker: each starting hand against 200,000 random opponent hands and boards, with ties counted as half a win.

Want to see randomness up close? Watch a few hundred spins on our free roulette wheel, or sit down at any table in the lobby.