[
  {
    "puzzle_id": "queens_9x9",
    "rows": 9,
    "cols": 9,
    "regions": [
      [0, 0, 1, 1, 1, 2, 2, 2, 2],
      [0, 1, 1, 4, 1, 1, 2, 3, 3],
      [1, 1, 4, 4, 4, 1, 1, 3, 3],
      [1, 5, 5, 4, 4, 4, 1, 1, 3],
      [1, 1, 4, 4, 4, 4, 4, 1, 1],
      [6, 1, 1, 4, 4, 4, 4, 4, 1],
      [6, 6, 1, 1, 4, 4, 4, 1, 1],
      [6, 6, 6, 1, 1, 7, 1, 1, 8],
      [6, 6, 6, 6, 1, 1, 1, 8, 8]
    ],
    "solution": [
      [0, 1],
      [1, 6],
      [2, 8],
      [3, 2],
      [4, 4],
      [5, 0],
      [6, 3],
      [7, 5],
      [8, 7]
    ]
  },
  {
    "puzzle_id": "queens_8x8",
    "rows": 8,
    "cols": 8,
    "regions": [
      [0, 0, 0, 0, 0, 0, 1, 1],
      [0, 0, 0, 2, 3, 0, 0, 1],
      [0, 0, 7, 2, 3, 3, 0, 0],
      [0, 4, 7, 2, 5, 3, 6, 0],
      [0, 4, 7, 2, 5, 3, 6, 0],
      [0, 0, 7, 2, 5, 3, 0, 0],
      [0, 0, 0, 2, 5, 0, 0, 0],
      [0, 0, 0, 0, 0, 0, 0, 0]
    ],
    "solution": [
      [0, 7],
      [1, 3],
      [2, 5],
      [3, 1],
      [4, 6],
      [5, 2],
      [6, 4],
      [7, 0]
    ]
  },
  {
    "puzzle_id": "queens_8x8_v2",
    "rows": 8,
    "cols": 8,
    "regions": [
      [0, 0, 1, 1, 1, 2, 2, 2],
      [0, 0, 0, 0, 1, 2, 2, 2],
      [3, 0, 0, 0, 1, 1, 2, 2],
      [3, 0, 0, 0, 0, 1, 1, 1],
      [3, 3, 3, 0, 0, 0, 6, 1],
      [4, 4, 3, 3, 6, 6, 6, 1],
      [4, 4, 5, 3, 6, 6, 7, 7],
      [4, 5, 5, 3, 3, 3, 7, 7]
    ],
    "solution": [
      [0, 3],
      [1, 5],
      [2, 0],
      [3, 4],
      [4, 6],
      [5, 1],
      [6, 7],
      [7, 2]
    ]
  },
  {
    "puzzle_id": "queens_7x7",
    "rows": 7,
    "cols": 7,
    "regions": [
      [0, 0, 0, 0, 0, 0, 1],
      [0, 2, 6, 3, 3, 3, 1],
      [0, 2, 6, 6, 6, 3, 1],
      [0, 2, 2, 5, 6, 3, 1],
      [0, 4, 2, 5, 5, 5, 1],
      [0, 4, 4, 4, 4, 5, 1],
      [0, 1, 1, 1, 1, 1, 1]
    ],
    "solution": [
      [0, 0],
      [1, 5],
      [2, 3],
      [3, 1],
      [4, 4],
      [5, 2],
      [6, 6]
    ]
  },
  {
    "puzzle_id": "queens_7x7_v2",
    "rows": 7,
    "cols": 7,
    "regions": [
      [0, 1, 1, 1, 1, 1, 3],
      [0, 1, 2, 3, 3, 1, 3],
      [0, 1, 2, 2, 3, 3, 3],
      [0, 1, 1, 1, 1, 1, 5],
      [0, 0, 4, 4, 4, 1, 5],
      [6, 1, 4, 4, 4, 1, 5],
      [6, 1, 1, 1, 1, 1, 5]
    ],
    "solution": [
      [0, 5],
      [1, 2],
      [2, 4],
      [3, 6],
      [4, 1],
      [5, 3],
      [6, 0]
    ]
  },
  {
    "puzzle_id": "queens_5x5",
    "rows": 5,
    "cols": 5,
    "regions": [
      [0, 1, 1, 1, 1],
      [3, 2, 3, 1, 3],
      [3, 2, 3, 3, 3],
      [3, 3, 3, 4, 4],
      [3, 3, 3, 3, 3]
    ],
    "solution": [
      [0, 0],
      [1, 3],
      [2, 1],
      [3, 4],
      [4, 2]
    ]
  }
]