Enter an original two-card hand, the dealer upcard and a supported rule profile. The result comes from versioned basic-strategy tables—there is no AI call, personal opinion or bet-size advice.
Strategy engine v1.0.0
Get one checkable decision
Conventional American peek/hole-card blackjack only.
Basic-strategy decision
Example result
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Select the cards and rules.
Applicable strategy-chart row
The marked cell matches the selected dealer upcard. Codes include the fallback where applicable.
| Hand | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | A |
|---|
H = Hit · S = Stand · D/H = Double; otherwise Hit · D/S = Double; otherwise Stand · P = Split · R/H, R/S or R/P = Surrender; otherwise the shown action
Supported game family
Version 1.0 supports conventional blackjack with a dealer hole card and an American peek before player action, dealer upcards 2 through Ace, 3:2 blackjack, doubling on any original two cards, and total-dependent hard, soft and pair strategy. Deck profiles are single deck, double deck and 4–8 decks; S17/H17 and DAS/no-DAS are supported throughout.
Late surrender is supported only for 4–8 decks, either against every upcard or against 2–10 only. Single- and double-deck surrender profiles are intentionally excluded because the checked source pages conflict on a fine-point pair exception. The engine stops rather than guesses.
Unsupported rules and variants
- Early surrender and surrender before a dealer blackjack check.
- European no-hole-card or no-peek games.
- Restricted doubling such as 9–11 or 10–11 only.
- Subsequent/multi-card hands, split-limit state and count-based deviations.
- Spanish 21, Free Bet Blackjack, Super Fun 21, Blackjack Switch, Double Exposure, push-22 games, side bets and other nonstandard variants.
If you do not know the table rules, use the Blackjack Rule-Comparison Tool first. For the full teaching context and chart notation, read the basic-strategy guide.
Decision order and fallbacks
The engine checks a supported late-surrender cell first, then an exact-rank pair, then a soft total, then a hard total. A pair means the same rank: K+K uses the pair row, while K+Q is an equal-value hard 20, not a pair. Double codes carry a hit-or-stand fallback. Split fallback is calculated by reclassifying the same cards without the pair action. Surrender codes carry their exact hit, stand or split fallback.
Sources checked 30 August 2026
- Wizard of Odds basic-strategy calculator, by Michael Shackleford: complete visible total-dependent matrices for deck group, S17/H17, DAS/no-DAS, surrender and American peek settings.
- Wizard of Odds surrender analysis: late-versus-early surrender definitions and deck-dependent fine points.
These are external research sources, not Sam’s personal observations. The local fixture records the checked date, every supported table cell and the intentionally unsupported combinations.
