{
  "patternType": "DOUBLE_ATTACK",
  "description": "Queen move that checks the king while targeting an undefended rook.",
  "cases": [
    {
      "id": "double_attack_queen_check_and_rook",
      "initialFen": "r3k3/8/8/8/8/8/8/3Q2K1 w - - 0 1",
      "sideToMove": "white",
      "bestMove": { "san": "Qa4+", "uci": "d1a4" },
      "resultingFen": "r3k3/8/8/8/Q7/8/8/6K1 b - - 1 1",
      "expectedPattern": {
        "type": "DOUBLE_ATTACK",
        "side": "white",
        "attackerSquares": ["a4"],
        "targetSquares": ["e8", "a8"],
        "explanationKey": "queen_check_and_rook"
      },
      "context": "A single queen move gives check on e8 and simultaneously eyes the rook on a8.",
      "tags": ["queen", "double_attack"]
    }
  ]
}