Casino Strategy Ireland: Blackjack, Slots, Roulette and Bankroll
Casino guides that start from the house edge: how slots work, blackjack basic strategy, roulette maths, the betting systems that don't work, and managing your bankroll.
No strategy beats the house edge over time. Some keep it as low as possible, some raise it, and many of those passed around online ignore it altogether. These guides start from the edge, because it decides the long-run result.
Blackjack strategy
Blackjack is the one casino game where your decisions change the edge. Basic strategy is a chart of the mathematically best play for every hand against every dealer up-card. With good rules it brings the house edge below 1%.
Basic strategy, simplified
| Your hand | Dealer shows 2–6 | Dealer shows 7–Ace |
|---|---|---|
| Hard 8 or less | Hit | Hit |
| Hard 9 | Double on 3–6, otherwise hit | Hit |
| Hard 10–11 | Double | Double 10 v 2–9, 11 v 2–10 |
| Hard 12 | Stand on 4–6, hit on 2–3 | Hit |
| Hard 13–16 | Stand | Hit |
| Hard 17+ | Stand | Stand |
| Soft 13–17 (Ace + 2–6) | Double on 5–6 (some on 3–4), otherwise hit | Hit |
| Soft 18 | Double on 3–6, stand on 2 | Stand on 7–8, hit on 9–Ace |
| Pair of Aces or 8s | Split | Split |
| Pair of 10s | Stand | Stand |
Card counting doesn't work online, where the shoe is reshuffled continuously. Avoid tables that pay 6:5 for blackjack and skip insurance.
How to play slots
Choose a high RTP and a volatility that fits your bankroll, set a session limit and treat a bonus as extra playing time. The online slots guide covers RTP and volatility in detail.
Roulette
| Variant | House edge |
|---|---|
| French, with la partage | 1.35% on even-money bets |
| European (single zero) | 2.7% |
| American (double zero) | 5.26% |
Play French or European, never American. Every bet on a European wheel has the same 2.7% edge, so bet type changes variance, not expected loss.
Betting systems that don't work
| System | How it works | Why it fails |
|---|---|---|
| Martingale | Double after every loss | A losing run hits the table limit or your bankroll first |
| Fibonacci | Raise stakes along the Fibonacci sequence | Same problem, more slowly |
| D'Alembert | Raise by one unit after a loss | Doesn't change the edge |
| "Hot" and "cold" numbers | Bet on recent patterns | Each spin is independent |
Bankroll management
Decide what you can afford to lose before you start, split it into sessions and stop when a session's budget is gone. Stake 1–2% of your session budget per bet, take breaks, and never chase losses. Use deposit limits and time-outs; Problem Gambling Ireland offers free support on 089 241 5401.
Roulette bets and their odds
| Bet | Pays | Chance (European wheel) |
|---|---|---|
| Single number | 35:1 | 1 in 37 |
| Split (two numbers) | 17:1 | 2 in 37 |
| Dozen or column | 2:1 | 12 in 37 |
| Red/black, odd/even | 1:1 | 18 in 37 |
Every bet on a European wheel has the same 2.7% edge; the bet type changes variance, not the expected loss.
Session bankroll
| Session budget | Stake (~1%) | Rounds |
|---|---|---|
| €50 | €0.50 | ~100 |
| €100 | €1 | ~100 |
| €200 | €2 | ~100 |
Practising with demo games
Most slots and table games have a demo mode. Use it to learn basic strategy or feel out a slot's volatility; demo results don't predict real-money results.
Comparing games by cost per hour
House edge alone doesn't show what a game costs you, because pace matters. A slot at 300 spins an hour with a 4% edge costs far more per hour than a blackjack table at 60 hands with under 1%. For the same €1 stake: slots about €12 an hour, roulette (~40 spins, 2.7%) about €1.08, blackjack (~60 hands, ~0.5%) about €0.30.
Knowing when to stop
Decide your stop points before you start: a loss limit, a win target and a time limit. When you hit any of them, stop. If you find yourself breaking those rules, use self-exclusion and talk to Problem Gambling Ireland on 089 241 5401.
House edge by game
| Game | House edge |
|---|---|
| Blackjack, basic strategy, good rules | Under 1% |
| Baccarat, banker bet | About 1.06% |
| European roulette | 2.7% |
| American roulette | 5.26% |
| Online slots | About 3–6% |
| Keno | Often 10% or more |
The edge is what each bet costs on average. Combine it with how many bets you make an hour to get your real cost.
Setting a session budget
Decide the amount you are prepared to lose before you start and treat it as the cost of the evening. Divide it into a stake per bet that gives you at least 100 to 200 bets. Set the limit in the casino's account settings so the decision is made before you play, not during.
Strategies that do not work
- Martingale: doubling after losses runs into table limits and your bankroll long before it recovers.
- Hot and cold numbers: past spins and draws do not change the next one.
- Timing slots: results do not depend on the time of day.
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