Blackjack against a dealer that lives in GitHub Actions, played by whoever turns up. Nothing to install, and no account beyond the one you already have: every decision is an issue, and the table is this file.
The dealer shows seven, and you have 10.
Beat the dealer without going over 21. A click opens a prefilled issue: submit it and the table moves in about 30 seconds.
Shoe 1 · 4.8 decks left · out of it: 6 7 Q 7 8 7 8 2 2 Q T T 5 K K 7 9 3 3 J 9 3 7 7 · all 62
-3u over 11 hands · 1 player · 0u lost to mistakes
| Hand | Player | Dealer | |
|---|---|---|---|
11 @kanywst | 22 bust (9 3 J) | 12 (3 9) | -25u |
10 @kanywst | 20 (T K) | 22 bust (5 K 7) | +25u |
9 @kanywst | 21 (7 2 2 Q) | 18 (8 T) | +25u |
6 decks · dealer stands on soft 17 · double after split · late surrender · blackjack pays 3 to 2 · shuffled at the 75% cut card
Pick a chip to deal a hand, then hit, stand, double, split or surrender with the buttons that appear. Each click opens an issue with the decision already written in the title — press Submit, and about 30 seconds later the table above has moved and the issue is closed with a note on what that decision was worth.
There is one table and one hand at a time, so whoever clicks next is the player. A link drawn for an earlier hand is refused rather than applied to whatever is on the table now.
- Six decks, dealt down to a cut card at 75% before the shoe is shuffled
- Every card that has come out of the shoe is listed under the table. Nothing here tells you the count; counting it is the game
- Each decision is priced from the cards actually left in the shoe, and what a mistake cost is added up per player
- Every hand is kept in .github/blackjack-log.txt
scripts/blackjack.py is the game: the rules, the state in .github/blackjack.json, and the renderer that writes the table between the two markers above. scripts/bjmath.py prices each decision against the shoe. .github/workflows/blackjack.yml runs them whenever an issue is opened whose title starts with bj|, then commits the redrawn README and closes the issue.
The hole card is not in the repository: the state file is public, so the dealer's second card is not drawn until it is turned over.
The cards in .github/cards are drawn by scripts/make_cards.py and committed rather than generated on each hand, so .github/workflows/checks.yml regenerates them on every pull request and fails if the committed art no longer matches its generator. .github/workflows/calculator.yml checks the calculator against all 260 cells of the published basic-strategy chart, nightly and on any change to it.
Moved out of the kanywst/kanywst profile README on 2026-10-02, with the shoe and the scores as they stood.