{
  "url": "https://theplaybookusa.com/tools/blackjack/test-fixtures.json",
  "tool": "Blackjack Basic Strategy Calculator and Trainer",
  "model": "Blackjack Strategy Lookup Model v2.1",
  "lastReviewed": "2026-05-17",
  "privacy": "Fixtures contain no account, operator, ticket, payment, identity or location data.",
  "boundary": "Educational basic-strategy training fixtures only. Not a profit predictor, table certification, legal check or payout advice.",
  "cases": [
    {
      "case": "pair_8s_vs_10_default",
      "input": {
        "cards": ["8", "8"],
        "dealerUpcard": "10",
        "profile": "4-8 decks, S17, DAS, no surrender, dealer peek, 3:2"
      },
      "expected": {
        "action": "Split",
        "warning": "A correct basic-strategy play can still lose."
      }
    },
    {
      "case": "soft_18_vs_9_default",
      "input": {
        "cards": ["A", "7"],
        "dealerUpcard": "9",
        "profile": "4-8 decks, S17, DAS, no surrender, dealer peek, 3:2"
      },
      "expected": {
        "action": "Hit"
      }
    },
    {
      "case": "hard_11_vs_ace_s17",
      "input": {
        "cards": ["5", "6"],
        "dealerUpcard": "A",
        "profile": "4-8 decks, S17, DAS, no surrender, dealer peek, 3:2"
      },
      "expected": {
        "action": "Hit"
      }
    },
    {
      "case": "hard_11_vs_ace_h17",
      "input": {
        "cards": ["5", "6"],
        "dealerUpcard": "A",
        "profile": "4-8 decks, H17, DAS, no surrender, dealer peek, 3:2"
      },
      "expected": {
        "action": "Double",
        "delta": "H17 changes selected soft-hand and hard-11-vs-ace decisions compared with S17."
      }
    },
    {
      "case": "hard_16_vs_10_late_surrender",
      "input": {
        "cards": ["10", "6"],
        "dealerUpcard": "10",
        "profile": "4-8 decks, S17, DAS, late surrender, dealer peek, 3:2"
      },
      "expected": {
        "action": "Surrender",
        "warning": "Use surrender only when late surrender is explicitly available at the table."
      }
    },
    {
      "case": "pair_2s_vs_2_no_das",
      "input": {
        "cards": ["2", "2"],
        "dealerUpcard": "2",
        "profile": "2 decks, S17, no DAS, no surrender, dealer peek, 3:2"
      },
      "expected": {
        "action": "Hit",
        "delta": "No-DAS reduces the value of some pair splits."
      }
    },
    {
      "case": "enhc_warning_on_split_vs_10",
      "input": {
        "cards": ["8", "8"],
        "dealerUpcard": "10",
        "profile": "4-8 decks, S17, DAS, no surrender, no peek / ENHC warning, 3:2"
      },
      "expected": {
        "action": "Split",
        "warning": "No-peek / ENHC tables can change double or split decisions against dealer 10 or ace."
      }
    },
    {
      "case": "six_to_five_warning",
      "input": {
        "cards": ["10", "6"],
        "dealerUpcard": "6",
        "profile": "4-8 decks, S17, DAS, no surrender, dealer peek, 6:5 payout warning"
      },
      "expected": {
        "action": "Stand",
        "warning": "A 6:5 blackjack payout worsens table value; correct basic strategy does not make 6:5 equivalent to 3:2."
      }
    }
  ]
}