{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/lichess/main/json-schema/lichess-game-schema.json",
  "title": "Lichess Game",
  "description": "A single Lichess game as returned by the games API. Captures core metadata, players, clock, opening, and the move record.",
  "type": "object",
  "required": ["id", "rated", "variant", "speed", "perf", "createdAt", "status"],
  "properties": {
    "id": {
      "type": "string",
      "description": "Short Lichess game identifier, typically eight characters."
    },
    "rated": {
      "type": "boolean",
      "description": "True if this is a rated game affecting player ratings."
    },
    "variant": {
      "type": "string",
      "description": "Chess variant played in this game.",
      "enum": ["standard", "chess960", "crazyhouse", "antichess", "atomic", "horde", "kingOfTheHill", "racingKings", "threeCheck", "fromPosition"]
    },
    "speed": {
      "type": "string",
      "description": "Time-control bucket for this game.",
      "enum": ["ultraBullet", "bullet", "blitz", "rapid", "classical", "correspondence"]
    },
    "perf": {
      "type": "string",
      "description": "Rating pool (perf) the game belongs to."
    },
    "createdAt": {
      "type": "integer",
      "description": "Game creation timestamp in milliseconds since the Unix epoch."
    },
    "lastMoveAt": {
      "type": "integer",
      "description": "Timestamp of the last move played, in milliseconds since the Unix epoch."
    },
    "status": {
      "type": "string",
      "description": "Final game status.",
      "enum": ["created", "started", "aborted", "mate", "resign", "stalemate", "timeout", "draw", "outoftime", "cheat", "noStart", "unknownFinish", "variantEnd"]
    },
    "source": {
      "type": "string",
      "description": "How the game was created (lobby, friend, ai, api, arena, swiss, position, import, etc.)."
    },
    "players": {
      "type": "object",
      "description": "Players by color.",
      "properties": {
        "white": {"$ref": "#/$defs/player"},
        "black": {"$ref": "#/$defs/player"}
      }
    },
    "initialFen": {
      "type": "string",
      "description": "Starting FEN. Present for variants or positional games where the start is not the standard initial position."
    },
    "winner": {
      "type": "string",
      "description": "Color of the winner if the game has a winner.",
      "enum": ["white", "black"]
    },
    "opening": {
      "type": "object",
      "description": "Detected opening for the game.",
      "properties": {
        "eco": {"type": "string", "description": "ECO code."},
        "name": {"type": "string", "description": "Opening name."},
        "ply": {"type": "integer", "description": "Number of plies that match the named opening."}
      }
    },
    "moves": {
      "type": "string",
      "description": "Space-separated list of moves in PGN SAN notation. Only present when requested in the export query."
    },
    "pgn": {
      "type": "string",
      "description": "Full PGN of the game. Only present when requested in the export query."
    },
    "clock": {
      "type": "object",
      "description": "Clock configuration.",
      "properties": {
        "initial": {"type": "integer", "description": "Initial time in seconds."},
        "increment": {"type": "integer", "description": "Increment per move in seconds."},
        "totalTime": {"type": "integer", "description": "Estimated total game time in seconds."}
      }
    },
    "daysPerTurn": {
      "type": "integer",
      "description": "Correspondence days per turn (only set for correspondence games)."
    },
    "tournament": {
      "type": "string",
      "description": "ID of the parent Arena tournament if the game is part of one."
    },
    "swiss": {
      "type": "string",
      "description": "ID of the parent Swiss tournament if the game is part of one."
    },
    "analysis": {
      "type": "array",
      "description": "Per-ply Stockfish evaluation when computer analysis has been requested.",
      "items": {
        "type": "object",
        "properties": {
          "eval": {"type": "integer", "description": "Centipawn evaluation from White's perspective."},
          "best": {"type": "string", "description": "Best move in UCI notation."},
          "variation": {"type": "string", "description": "Principal variation in SAN."},
          "judgment": {
            "type": "object",
            "properties": {
              "name": {"type": "string", "enum": ["Inaccuracy", "Mistake", "Blunder"]},
              "comment": {"type": "string"}
            }
          },
          "mate": {"type": "integer", "description": "Mate-in-N indicator."}
        }
      }
    }
  },
  "$defs": {
    "player": {
      "type": "object",
      "properties": {
        "user": {
          "type": "object",
          "properties": {
            "id": {"type": "string"},
            "name": {"type": "string"},
            "title": {"type": "string"},
            "patron": {"type": "boolean"}
          }
        },
        "aiLevel": {"type": "integer", "description": "Stockfish level when the player is the AI."},
        "rating": {"type": "integer"},
        "ratingDiff": {"type": "integer", "description": "Rating change applied after the game."},
        "provisional": {"type": "boolean"},
        "berserk": {"type": "boolean", "description": "True if the player berserked in an Arena game."},
        "team": {"type": "string", "description": "Team identifier when the game is part of a Team Battle Arena."}
      }
    }
  }
}