concept+30 XP

Why Card Counting Works

The Hi-Lo Card Counting System

Card counting is a legal technique that tracks the ratio of high cards (10s, face cards, Aces) to low cards remaining in the shoe. When the deck is rich in high cards, the player has an advantage because: blackjacks pay 3:2 (and high cards make blackjacks more likely), dealers bust more often on stiff hands, and doubling down is more profitable.

Hi-Lo Count Values

Card	Count Value	Reason
2, 3, 4, 5, 6	+1	Low cards removed = deck gets better for player
7, 8, 9	0	Neutral — no significant effect
10, J, Q, K, A	-1	High cards removed = deck gets worse for player

True Count Formula

True Count = Running Count ÷ Decks Remaining

The true count normalizes the running count for the number of decks left. A true count of +2 means the same thing whether you're playing a single deck or an 8-deck shoe.

Player Edge by True Count

True Count -3 or lower (House has big edge)5%

True Count 0 (Neutral)50%

True Count +1 (Slight player edge)55%

True Count +2 (Player edge ~0.5%)60%

True Count +3 (Player edge ~1%)70%

True Count +5 (Player edge ~2%)85%

Casinos Watch for Counters

Card counting is legal but casinos can ban you for it. Signs that attract attention: dramatically varying bet sizes, long hesitation on decisions, and tracking the discard tray. Skilled counters use 'cover plays' — intentional small mistakes — to disguise their technique.

Example

Practice running count: 5, 3, K, 7, A, 2, Q, 8, 4, 6

5 → +1 (RC: 1)
3 → +1 (RC: 2)
K → -1 (RC: 1)
7 →  0 (RC: 1)
A → -1 (RC: 0)
2 → +1 (RC: 1)
Q → -1 (RC: 0)
8 →  0 (RC: 0)
4 → +1 (RC: 1)
6 → +1 (RC: 2)
Final Running Count: +2

With 6 decks remaining, the True Count = 2 ÷ 6 = +0.33. Barely positive — maintain minimum bet.