Six-deck shoe, early
You are 78 cards into a six-deck shoe (312 cards), so 234 cards remain — that is 4.5 decks. Your running count is +6.
6 ÷ 4.5 = 1.33 → true count +1
A running count of +6 is worth only about +1 per deck this early.
How card counting works
Card counting is arithmetic. You give every card a small number, you add those numbers up as cards are dealt, and then you scale the total by how much of the shoe is left. That is the whole mechanism. The hard part is doing it quickly and without losing your place, which is what the drill is for.
Step 1: the card values
Count Trainer uses Hi-Lo, the most common system. It has three values:
| Cards | Value |
|---|---|
| 2 3 4 5 6 | +1 |
| 7 8 9 | 0 |
| 10 J Q K A | -1 |
Twenty cards in a deck are worth +1, twenty are worth -1, and twelve are worth 0. The values cancel out, so a full deck counted from start to finish always finishes on zero.
Step 2: the running count
The running count is one number that starts at 0 when the shoe is shuffled and changes with every card you see. Card appears, add its value, keep the new total in your head, forget the card. You never track which cards came out, only the total.
Here are eight cards dealt in order, with the running count after each one:
| Card dealt | Value | Running count |
|---|---|---|
| 5 of hearts | +1 | +1 |
| King of spades | -1 | 0 |
| 3 of clubs | +1 | +1 |
| 2 of diamonds | +1 | +2 |
| 8 of hearts | 0 | +2 |
| Ace of clubs | -1 | +1 |
| 6 of spades | +1 | +2 |
| 10 of hearts | -1 | +1 |
After those eight cards the running count is +1. A positive count means more low cards than high cards have already been dealt, so the cards still to come are richer in tens and aces than a fresh deck would be. A negative count means the opposite.
Step 3: the true count
A running count of +6 does not mean the same thing in every situation. If it built up over half a deck, the remaining cards are heavily skewed. If it built up over five decks, those same six extra high cards are spread thinly across hundreds of cards and barely move the odds at all.
The true count fixes that by expressing the count per deck still to be dealt:
true count = running count ÷ decks remaining
Dividing by decks remaining is what makes the number comparable between the start and the end of a shoe. It answers a different question: not "how many extra high cards are left?" but "how concentrated are they?"
Worked examples
Six-deck shoe, late
Same shoe, same running count of +6, but now 260 cards have been dealt and only 52 remain — one deck.
6 ÷ 1 = 6 → true count +6
Identical running count, six times the true count. This is the reason the division matters.
A negative count
Two-deck game, 26 cards dealt, so 78 remain — 1.5 decks. Running count is -5.
-5 ÷ 1.5 = -3.33 → true count -3
Negative counts round the same way as positive ones. Count Trainer rounds the true count to the nearest whole number and expects that value exactly.
Single deck
In a single-deck game with 39 cards left (0.75 of a deck) and a running count of +3:
3 ÷ 0.75 = 4 → true count +4
With less than a full deck remaining the division makes the true count larger than the running count.
Estimating decks remaining
At a real table nobody hands you the number of cards left; players estimate it by looking at the discard tray in half-deck steps. In the drill the app knows exactly how many cards remain, so what you are practising here is the division and the rounding, not the visual estimate.
A useful habit: round decks remaining to the nearest half deck before dividing. Dividing +7 by 3.5 in your head is much easier than dividing by 3.42, and the answer is close enough for the count to be useful.
How to practise
- Start with one deck, a slow card speed and the live count shown. Check your own total against the app after every few cards.
- Turn the live count off once you can get through a deck and land on zero. That is the real test.
- Speed up before you add decks. Accuracy at 1.0 second per card is worth more than accuracy at 3.0 seconds with six decks.
- Turn on true-count questions last. Running count has to be automatic before dividing on top of it is realistic.
An honest note
This is a training tool for the arithmetic. It teaches you to hold a number in your head while cards go past and to divide it accurately under time pressure. It is not a strategy guide, it does not cover bankroll, betting, or table conditions, and it is not a claim that arithmetic alone produces an edge anywhere. Treat it as a mental maths exercise built around a deck of cards.