{
  "patternType": "OVERLOADING",
  "description": "The defending rook on f8 is overloaded, forced to choose between guarding the back rank and protecting f7.",
  "cases": [
    {
      "id": "overloading_rook_on_f8",
      "initialFen": "5rk1/5p2/8/3Q4/8/8/8/4R1K1 w - - 0 1",
      "sideToMove": "white",
      "bestMove": { "san": "Qxf7+", "uci": "d5f7" },
      "resultingFen": "5rk1/5Q2/8/8/8/8/8/4R1K1 b - - 0 1",
      "expectedPattern": {
        "type": "OVERLOADING",
        "side": "white",
        "attackerSquares": ["f7"],
        "targetSquares": ["f8", "f7"],
        "explanationKey": "back_rank_vs_defense"
      },
      "context": "Capturing on f7 lures the only defender; after ...Rxf7 the back rank collapses to Re8#.",
      "tags": ["overloading", "back_rank_setup"]
    }
  ]
}