| Strategy | Game | What it does | Verdict |
|---|---|---|---|
| Basic strategy | Blackjack | Best move for every hand | Works: cuts the house edge to about 0.5% |
| Card counting | Blackjack (land-based) | Bets more when the deck favours you | Works in theory, hard in practice, useless online |
| Martingale | Roulette, any even-money bet | Doubles the bet after each loss | Myth: rare but huge losses |
| Reverse Martingale / Paroli | Any even-money bet | Doubles the bet after each win | Doesn't change the edge |
| Fibonacci | Any even-money bet | Raises bets along the Fibonacci sequence | Myth: slower Martingale |
| D'Alembert | Any even-money bet | +1 unit after a loss, −1 after a win | Myth: based on the gambler's fallacy |
| Labouchère | Any even-money bet | Crosses numbers off a betting line | Myth: can escalate fast |
| Hot and cold slots | Slots | Plays machines that are 'due' to pay | Myth: every spin is independent |
| Bonus hunting | Any | Plays bonuses with low wagering | Rarely worth it |
The rule behind every system
In every casino game except blackjack and poker, each round is independent and the house edge is built into the payouts. No betting pattern can change that edge: it only changes how your wins and losses are spread out over time. That's why progressions like the Martingale feel like they work for a while, then fail all at once.
Basic strategy (blackjack): works
Basic strategy is the mathematically best decision for every blackjack hand. It doesn't let you beat the casino, but it brings the house edge down to around 0.5% at a good table, which is the lowest of any casino game. It's the only strategy on this page that every player should use. Our free chart and trainer show you every move.
Card counting (blackjack): works in theory, hard in practice
Counting tracks which cards are left in the shoe and raises your bets when the remaining cards favour you. In a land-based casino with a deep shoe, a skilled counter can gain a small edge of around 0.5 to 1.5%, but it takes practice, a big bankroll, and casinos can ask you to leave. Online, it doesn't work: RNG games reshuffle after every hand, and live tables usually shuffle well before the end of the shoe.
Martingale: a myth with a hidden cost
You double your bet after each loss, so the first win recovers everything plus one unit. It wins small amounts very often, but a losing streak quickly reaches the table limit or your budget. On an even-money roulette bet, ten losses in a row happen about once every 780 sequences, and starting at €5 you would need to bet €5,120 on the next spin, after losing €5,115.
Paroli, Fibonacci, D'Alembert and Labouchère: same problem
These are variations on the same idea. The Paroli (reverse Martingale) raises bets after wins, the Fibonacci raises them more slowly after losses, the D'Alembert adds one unit after a loss because a win is supposedly 'due', and the Labouchère crosses numbers off a list. None of them changes the house edge. They only change the size and timing of the swings, and the losing progressions can still escalate fast.
Hot and cold slots: a myth
Modern slots use a random number generator: each spin is independent of the previous ones, so a machine is never 'due' to pay and a machine that just paid isn't 'empty'. The RTP is fixed by the game's settings, not by its recent results. We explain this in detail in our guide to full and empty slot machines.
Bonus hunting: rarely worth it
Some players look for bonuses with low wagering to gain a small mathematical edge. With today's standard 35x to 40x wagering, most bonuses cost more than they give on average, and casinos restrict the games and bet sizes that can clear them. Rewards with no wagering, like rakeback, are the exception.
What actually protects your money
Pick games with a low house edge, play at fair tables (3:2 blackjack, European roulette), use basic strategy, avoid side bets, and set a budget and a time limit before you start. No strategy turns gambling into income.
Read more
Practise basic strategy for free
FAQ
Is there a strategy that always wins at the casino?
No. Except for card counting in specific land-based conditions, no strategy can overcome the house edge.
Does the Martingale work?
It wins small amounts often, but a losing streak eventually costs far more than all the small wins. It doesn't change the house edge.
Does card counting work online?
No. Online RNG games reshuffle after every hand, and live tables usually shuffle long before the end of the shoe.
Are there hot and cold slot machines?
No. Every spin is random and independent, so a machine is never due to pay.
Related guides
Strategy and maths reduce the house edge, but never remove it. 18+, play responsibly.