{
  "$defs": {
    "answer-history-summary": {
      "additionalProperties": false,
      "properties": {
        "metric": {
          "description": "Metric.",
          "type": "string"
        },
        "value": {
          "description": "Value.",
          "type": "string"
        }
      },
      "required": [
        "metric",
        "value"
      ],
      "type": "object"
    },
    "data-dictionary": {
      "additionalProperties": false,
      "properties": {
        "dataset_id": {
          "description": "Dataset id.",
          "type": "string"
        },
        "description": {
          "description": "Description.",
          "type": "string"
        },
        "field": {
          "description": "Field.",
          "type": "string"
        },
        "nullable": {
          "description": "Nullable.",
          "type": "boolean"
        },
        "type": {
          "description": "Type.",
          "type": "string"
        }
      },
      "required": [
        "dataset_id",
        "field",
        "type",
        "nullable",
        "description"
      ],
      "type": "object"
    },
    "familiar-opener-benchmark": {
      "additionalProperties": false,
      "properties": {
        "average_guesses": {
          "description": "Mean turns among games solved within six under the fixed policy.",
          "type": "number"
        },
        "entropy_bits": {
          "description": "Shannon entropy of the feedback partition, in bits.",
          "type": "number"
        },
        "expected_remaining": {
          "description": "Expected candidate count after the represented guess or pair.",
          "type": "number"
        },
        "familiar_rank": {
          "description": "Familiar rank.",
          "type": "integer"
        },
        "hard_mode_opening_legal": {
          "description": "True because Hard Mode imposes no prior-hint constraint on turn one.",
          "type": "boolean"
        },
        "is_answer_candidate": {
          "description": "Boolean indicator for the named condition.",
          "type": "boolean"
        },
        "overall_rank": {
          "description": "Overall rank.",
          "type": "integer"
        },
        "six_turn_continuation_mode": {
          "description": "Mode used by the six-turn continuation simulation columns.",
          "type": "string"
        },
        "vocabulary_class": {
          "description": "Reason the word passes the site's player-facing vocabulary screen.",
          "type": "string"
        },
        "volatility": {
          "description": "Population standard deviation of turns among games solved within six.",
          "type": "number"
        },
        "win_rate_percent": {
          "description": "Percentage of simulated games solved within six turns.",
          "type": "number"
        },
        "word": {
          "description": "Lowercase five-letter accepted guess.",
          "type": "string"
        },
        "worst_remaining": {
          "description": "Largest candidate bucket after the represented guess or pair.",
          "type": "integer"
        }
      },
      "required": [
        "familiar_rank",
        "overall_rank",
        "word",
        "vocabulary_class",
        "is_answer_candidate",
        "hard_mode_opening_legal",
        "six_turn_continuation_mode",
        "average_guesses",
        "win_rate_percent",
        "volatility",
        "entropy_bits",
        "expected_remaining",
        "worst_remaining"
      ],
      "type": "object"
    },
    "letter-frequency": {
      "additionalProperties": false,
      "properties": {
        "count": {
          "description": "Count.",
          "type": "integer"
        },
        "letter": {
          "description": "Letter.",
          "type": "string"
        },
        "position": {
          "description": "Position.",
          "type": "string"
        },
        "scope": {
          "description": "Scope.",
          "type": "string"
        }
      },
      "required": [
        "scope",
        "position",
        "letter",
        "count"
      ],
      "type": "object"
    },
    "opener-feedback-branches": {
      "additionalProperties": false,
      "properties": {
        "branch_rank": {
          "description": "Branch rank.",
          "type": "integer"
        },
        "feedback": {
          "description": "Five feedback digits: 0 gray, 1 yellow, and 2 green.",
          "type": "string"
        },
        "is_all_gray": {
          "description": "Boolean indicator for the named condition.",
          "type": "boolean"
        },
        "is_solved": {
          "description": "Boolean indicator for the named condition.",
          "type": "boolean"
        },
        "opener": {
          "description": "Opener.",
          "type": "string"
        },
        "opener_overall_rank": {
          "description": "Opener overall rank.",
          "type": "integer"
        },
        "probability_percent": {
          "description": "Branch frequency under a uniform working-answer prior.",
          "type": "number"
        },
        "remaining_answers": {
          "description": "Working-pool answers that produce this exact feedback.",
          "type": "integer"
        }
      },
      "required": [
        "opener",
        "opener_overall_rank",
        "branch_rank",
        "feedback",
        "remaining_answers",
        "probability_percent",
        "is_all_gray",
        "is_solved"
      ],
      "type": "object"
    },
    "opener-rankings": {
      "additionalProperties": false,
      "properties": {
        "average_guesses": {
          "description": "Mean turns among games solved within six under the fixed policy.",
          "type": "number"
        },
        "effective_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "number"
        },
        "entropy_bits": {
          "description": "Shannon entropy of the feedback partition, in bits.",
          "type": "number"
        },
        "expected_remaining": {
          "description": "Expected candidate count after the represented guess or pair.",
          "type": "number"
        },
        "failed_within_six": {
          "description": "Failed within six.",
          "type": "integer"
        },
        "information_tier": {
          "description": "Information tier.",
          "type": "string"
        },
        "is_answer_candidate": {
          "description": "Boolean indicator for the named condition.",
          "type": "boolean"
        },
        "largest_partition_pattern": {
          "description": "Largest partition pattern.",
          "type": "string"
        },
        "posterior_entropy_bits": {
          "description": "Posterior entropy bits.",
          "type": "number"
        },
        "probability_bucket_ge_4": {
          "description": "Probability bucket ge 4.",
          "type": "number"
        },
        "probability_bucket_ge_6": {
          "description": "Probability bucket ge 6.",
          "type": "number"
        },
        "probability_solve_now": {
          "description": "Probability solve now.",
          "type": "number"
        },
        "rank": {
          "description": "Rank within this dataset using the method documented for it.",
          "type": "integer"
        },
        "solved_on_turn_1": {
          "description": "Simulation answers solved on turn 1.",
          "type": "integer"
        },
        "solved_on_turn_2": {
          "description": "Simulation answers solved on turn 2.",
          "type": "integer"
        },
        "solved_on_turn_3": {
          "description": "Simulation answers solved on turn 3.",
          "type": "integer"
        },
        "solved_on_turn_4": {
          "description": "Simulation answers solved on turn 4.",
          "type": "integer"
        },
        "solved_on_turn_5": {
          "description": "Simulation answers solved on turn 5.",
          "type": "integer"
        },
        "solved_on_turn_6": {
          "description": "Simulation answers solved on turn 6.",
          "type": "integer"
        },
        "unique_feedback_patterns": {
          "description": "Unique feedback patterns.",
          "type": "integer"
        },
        "volatility": {
          "description": "Population standard deviation of turns among games solved within six.",
          "type": "number"
        },
        "win_rate_percent": {
          "description": "Percentage of simulated games solved within six turns.",
          "type": "number"
        },
        "word": {
          "description": "Lowercase five-letter accepted guess.",
          "type": "string"
        },
        "worst_remaining": {
          "description": "Largest candidate bucket after the represented guess or pair.",
          "type": "integer"
        }
      },
      "required": [
        "word",
        "average_guesses",
        "win_rate_percent",
        "volatility",
        "failed_within_six",
        "solved_on_turn_1",
        "solved_on_turn_2",
        "solved_on_turn_3",
        "solved_on_turn_4",
        "solved_on_turn_5",
        "solved_on_turn_6",
        "entropy_bits",
        "expected_remaining",
        "posterior_entropy_bits",
        "effective_remaining",
        "worst_remaining",
        "probability_bucket_ge_4",
        "probability_bucket_ge_6",
        "probability_solve_now",
        "unique_feedback_patterns",
        "largest_partition_pattern",
        "information_tier",
        "is_answer_candidate",
        "rank"
      ],
      "type": "object"
    },
    "opening-pair-frontier": {
      "additionalProperties": false,
      "properties": {
        "distinct_letters": {
          "description": "Distinct letters.",
          "type": "integer"
        },
        "expected_remaining": {
          "description": "Expected candidate count after the represented guess or pair.",
          "type": "number"
        },
        "expected_worst_pareto": {
          "description": "Whether no evaluated pair is better on both expected and worst remainder.",
          "type": "boolean"
        },
        "joint_entropy_bits": {
          "description": "Shannon entropy of the pair's joint feedback signature, in bits.",
          "type": "number"
        },
        "joint_entropy_rank": {
          "description": "Joint entropy rank.",
          "type": "integer"
        },
        "shared_letters": {
          "description": "Shared letters.",
          "type": "string"
        },
        "unique_joint_patterns": {
          "description": "Unique joint patterns.",
          "type": "integer"
        },
        "word_1": {
          "description": "Word 1.",
          "type": "string"
        },
        "word_2": {
          "description": "Word 2.",
          "type": "string"
        },
        "worst_remaining": {
          "description": "Largest candidate bucket after the represented guess or pair.",
          "type": "integer"
        }
      },
      "required": [
        "joint_entropy_rank",
        "word_1",
        "word_2",
        "joint_entropy_bits",
        "expected_remaining",
        "worst_remaining",
        "unique_joint_patterns",
        "distinct_letters",
        "shared_letters",
        "expected_worst_pareto"
      ],
      "type": "object"
    },
    "puzzle-difficulty": {
      "additionalProperties": false,
      "properties": {
        "adieu_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "integer"
        },
        "average_reference_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "number"
        },
        "crane_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "integer"
        },
        "date": {
          "description": "ISO 8601 date of a globally completed puzzle.",
          "type": "string"
        },
        "is_repeat": {
          "description": "Boolean indicator for the named condition.",
          "type": "boolean"
        },
        "optimal_turns": {
          "description": "Optimal turns.",
          "type": "integer"
        },
        "optimal_turns_imputed": {
          "description": "Optimal turns imputed.",
          "type": "boolean"
        },
        "puzzle_number": {
          "description": "Puzzle number derived from the June 19, 2021 day-zero convention.",
          "type": "integer"
        },
        "repeat_number": {
          "description": "Repeat number.",
          "type": "integer"
        },
        "repeated_letter_count": {
          "description": "Count represented by this field.",
          "type": "integer"
        },
        "slate_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "integer"
        },
        "solver_pressure_label": {
          "description": "Human-readable band for solver_pressure_percentile.",
          "type": "string"
        },
        "solver_pressure_percentile": {
          "description": "Midrank percentile within the released completed-puzzle rows.",
          "type": "integer"
        },
        "trap_family_size": {
          "description": "Size of the answer's largest one-slot family; the answer is omitted.",
          "type": "integer"
        },
        "vowel_count": {
          "description": "Count represented by this field.",
          "type": "integer"
        }
      },
      "required": [
        "date",
        "puzzle_number",
        "repeat_number",
        "is_repeat",
        "optimal_turns",
        "optimal_turns_imputed",
        "crane_remaining",
        "slate_remaining",
        "adieu_remaining",
        "average_reference_remaining",
        "trap_family_size",
        "repeated_letter_count",
        "vowel_count",
        "solver_pressure_percentile",
        "solver_pressure_label"
      ],
      "type": "object"
    },
    "trap-families": {
      "additionalProperties": false,
      "properties": {
        "best_probe": {
          "description": "Best probe.",
          "type": "string"
        },
        "best_probe_can_be_answer": {
          "description": "Best probe can be answer.",
          "type": "boolean"
        },
        "best_probe_entropy_bits": {
          "description": "Best probe entropy bits.",
          "type": "number"
        },
        "best_probe_expected_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "number"
        },
        "best_probe_worst_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "integer"
        },
        "candidate_only_expected_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "number"
        },
        "candidate_only_guess": {
          "description": "Candidate only guess.",
          "type": "string"
        },
        "candidate_only_worst_remaining": {
          "description": "Candidate count left by this measurement.",
          "type": "integer"
        },
        "family_size": {
          "description": "Count represented by this field.",
          "type": "integer"
        },
        "member_words": {
          "description": "Alphabetical list of working-pool members in the family.",
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "pattern": {
          "description": "Five-character one-slot family pattern; underscore is the varying position.",
          "type": "string"
        },
        "probe_search_count": {
          "description": "Count represented by this field.",
          "type": "integer"
        },
        "rank": {
          "description": "Rank within this dataset using the method documented for it.",
          "type": "integer"
        },
        "recorded_appearances_through_cutoff": {
          "description": "Recorded appearances through cutoff.",
          "type": "integer"
        },
        "varying_letters": {
          "description": "Varying letters.",
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "varying_position": {
          "description": "Varying position.",
          "type": "integer"
        }
      },
      "required": [
        "rank",
        "pattern",
        "varying_position",
        "family_size",
        "member_words",
        "varying_letters",
        "recorded_appearances_through_cutoff",
        "best_probe",
        "best_probe_can_be_answer",
        "best_probe_expected_remaining",
        "best_probe_worst_remaining",
        "best_probe_entropy_bits",
        "candidate_only_guess",
        "candidate_only_expected_remaining",
        "candidate_only_worst_remaining",
        "probe_search_count"
      ],
      "type": "object"
    }
  },
  "$id": "https://www.fiveletterwords.io/data/releases/v2026-07-15/schema.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "description": "Schemas describe each item in a dataset JSON file's records array.",
  "title": "FiveLetterWords research release v2026-07-15 record schemas"
}