The problem
Search for a blackjack strategy chart and you get a flood of coloured grids. Most of them never say which rules they were built for. They do not tell you whether the dealer stands or hits on soft 17, whether you may double after splitting, or whether the table offers surrender — even though several cells change depending on the answer.
Different rules need a different chart. An image cannot do that.
Seven things this site does differently
1. The chart recalculates for your table
Toggle dealer soft 17 (S17/H17), double after split (DAS) or late surrender, and the verdict plus all three charts are recomputed. It is not a static picture but a chart worked out on the spot. Hard 16 against a dealer 10 reads R with surrender available and H without it.
2. It shows you where you are, not just the answer
Alongside the verdict, the matching cell in the chart below is outlined. The chart becomes familiar as you use it, until eventually you can read a hand without the tool. A tool that only spits out answers keeps you dependent on it.
3. It tells you why in one line
"Stand" on its own does not stick. "A dealer 6 busts often, so let the dealer take the risk instead of taking it yourself" is something you can apply next time without looking anything up.
4. It handles hands of three cards and more
This is the part most charts quietly leave out. Every published chart assumes exactly two cards. Once you have hit even once, a D printed in the chart is no longer a legal play. This site checks how many cards you are holding and, when double, split or surrender is unavailable, names the fallback play and says why it changed.
5. The dealer's cards cannot be confused with yours
An input mistake produces a wrong answer. The dealer sits on a dark "house" panel with one face-up card and a face-down hole card; your side is a light panel that fans out as many cards as you actually hold. Tone, silhouette and label all differ at once, so the two cannot blur together.
6. The values were checked
Forty-eight key cells across the hard, soft and pair charts were compared one by one against widely published 4–8 deck charts, covering S17 and H17, DAS on and off, and surrender on and off. All of them agree. The check is re-run whenever the code changes.
The simulator was verified the same way: twelve million hands per rule set, with the resulting house edge landing within one standard error of the published figures.
7. No account, no install, no tracking
There is nothing to sign up for and nothing to download. The cards you enter are calculated inside your own browser and never sent to a server. The details are in the privacy policy.
What this site does not cover
The charts here are for 4–8 deck shoe games only. Single and double deck games are affected enough by card removal that several cells change, so they are left out rather than approximated. Count-based deviations such as the Illustrious 18 are also not included. Stating the limits seems better than pretending to cover everything.
Why it exists
Blackjack is one of the few casino games whose optimal solution is completely known. The correct play in every situation has been computed and is freely available. Most people still play on instinct.
So this was built as a teaching object: a way to see how probability and expected value behave in an actual decision. Questions like "do I stand on 16 or take a card" show how often intuition is wrong, and why.
Where this site stands
This site does not encourage gambling. Basic strategy cuts the house edge to roughly 0.5%, but 0.5% is still negative. The longer you play, the more you lose on average. What this site teaches is not how to win but how to lose most slowly, and it tries not to blur that.
Gambling law differs sharply between countries and between states. Check what applies where you live and decide responsibly.
If you need help
If gambling is affecting your daily life or your finances, do not try to handle it alone. In the US, the National Problem Gambling Helpline is free and confidential on 1-800-GAMBLER. Most other countries run an equivalent service.
Contact
Corrections to the charts, feature suggestions and any other questions are welcome. If you find a cell that disagrees with a published chart, please say which rule settings were active and what the hand was, and it will be checked.
- yun@adxstudiocorp.com