Introduction to Blackjack
Blackjack offers one of the lowest house edges of any casino game when played with optimal strategy. This guide will help you make the mathematically best decision in every situation.
Blackjack Basics
The Objective
Beat the dealer by getting a hand closer to 21 without going over (busting).
Card Values
- Number cards (2-10): Face value
- Face cards (J, Q, K): 10
- Aces: 1 or 11 (your choice)
Key Terms
- Hit: Take another card
- Stand: Keep your current hand
- Double Down: Double your bet and receive one more card
- Split: Divide a pair into two separate hands
- Surrender: Give up half your bet and fold (if available)
- Insurance: Side bet when dealer shows an Ace
Basic Strategy
Basic strategy is the mathematically optimal play for every hand combination. Following it reduces the house edge to around 0.5%.
Hard Hands (No Ace counted as 11)
- 8 or less: Always hit
- 9: Double against dealer 3-6, otherwise hit
- 10: Double against dealer 2-9, hit against 10 or Ace
- 11: Double against dealer 2-10, hit against Ace
- 12: Stand against 4-6, hit against everything else
- 13-16: Stand against 2-6, hit against 7+
- 17+: Always stand
Soft Hands (Ace counted as 11)
- Soft 13-14: Double against 5-6, otherwise hit
- Soft 15-16: Double against 4-6, otherwise hit
- Soft 17: Double against 3-6, otherwise hit
- Soft 18: Stand against 2, 7, 8; Double against 3-6; Hit against 9, 10, Ace
- Soft 19-20: Always stand
Pairs
- Aces: Always split
- 8s: Always split
- 10s: Never split (stand)
- 5s: Never split (treat as 10, double against 2-9)
- 4s: Split only against 5-6, otherwise hit
- 2s, 3s, 7s: Split against 2-7, otherwise hit
- 6s: Split against 2-6, otherwise hit
- 9s: Split against 2-6 and 8-9, stand against 7, 10, Ace
Money Management
- Set a session bankroll and don't exceed it
- Minimum 20-30 betting units recommended for a session
- Avoid insurance bets (house edge is 7%+)
- Don't take "even money" on blackjack
Common Mistakes to Avoid
- Standing on soft 17 (you should hit or double)
- Taking insurance
- Splitting 10s
- Not doubling on 11 against dealer 2-10
- Standing on 12 against dealer 2 or 3
- Playing at tables with 6:5 blackjack payouts (always choose 3:2)
Choosing the Right Blackjack Game
Look for these favorable rules:
- 3:2 payout for blackjack (not 6:5)
- Dealer stands on soft 17
- Double after split allowed
- Fewer decks (single deck best, if 3:2 payout)
- Surrender option available
Card Counting Basics
Card counting involves tracking the ratio of high to low cards remaining. While legal, it's not effective online due to automatic shuffling. It's also difficult in live casino games with multiple decks.
The Hi-Lo system assigns:
- 2-6: +1
- 7-9: 0
- 10-Ace: -1
A positive count favors the player; negative favors the dealer.