{
 "grid_size": 10,
 "polyominos": [
  {
   "tiles": [
    [
     5,
     7
    ],
    [
     5,
     8
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 0,
   "color": [
    110,
    0,
    0
   ]
  },
  {
   "tiles": [
    [
     7,
     9
    ],
    [
     8,
     9
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 1,
   "color": [
    110,
    0,
    0
   ]
  },
  {
   "tiles": [
    [
     9,
     3
    ],
    [
     9,
     4
    ],
    [
     9,
     5
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 2,
   "color": [
    110,
    0,
    0
   ]
  },
  {
   "tiles": [
    [
     0,
     8
    ],
    [
     1,
     7
    ],
    [
     1,
     8
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 3,
   "color": [
    110,
    0,
    0
   ]
  },
  {
   "tiles": [
    [
     2,
     0
    ],
    [
     3,
     0
    ],
    [
     3,
     1
    ],
    [
     4,
     1
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 4,
   "color": [
    110,
    0,
    0
   ]
  },
  {
   "tiles": [
    [
     0,
     1
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     2
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     3,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     3,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     1
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     2
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     2
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     9,
     6
    ]
   ],
   "piece_type": "BARRIER"
  }
 ],
 "level_color": [
  110,
  0,
  0
 ],
 "meta": {
  "generator": "mutate_harden",
  "preset": "10x10/5",
  "tier": "hard",
  "seed_optimal": 16,
  "harden_seconds": 51,
  "harden_restarts": 1,
  "hard_target": 33,
  "soft_flaws": [],
  "hard_flaws": [],
  "beautify": {
   "removed": 1,
   "filled": 1
  },
  "taste": {
   "score": 3,
   "verdict": "tidy",
   "summary": "The board has a strong central structure, but the right side is cluttered with a narrow 1-cell gap and a stray notch on the shell; joining the x=7 wall to the shell would create a cleaner silhouette.",
   "issues": [
    {
     "kind": "ragged_shell",
     "cells": [
      [
       9,
       6
      ]
     ],
     "note": "A single barrier cell at the right edge creates a tiny notch that looks accidental."
    },
    {
     "kind": "near_miss",
     "cells": [
      [
       7,
       1
      ],
      [
       7,
       2
      ],
      [
       7,
       3
      ],
      [
       7,
       4
      ],
      [
       7,
       5
      ],
      [
       7,
       6
      ],
      [
       7,
       7
      ]
     ],
     "note": "The vertical wall at x=7 is separated from the right shell by a 1-cell gap, creating a narrow corridor that feels like a layout error."
    },
    {
     "kind": "near_miss",
     "cells": [
      [
       8,
       2
      ],
      [
       8,
       3
      ]
     ],
     "note": "These cells are adjacent to the x=7 wall and the right shell, creating a jagged gap."
    }
   ],
   "suggest_fill": [
    [
     8,
     1
    ],
    [
     8,
     4
    ],
    [
     8,
     5
    ],
    [
     8,
     6
    ],
    [
     8,
     7
    ],
    [
     9,
     7
    ],
    [
     9,
     5
    ],
    [
     9,
     4
    ],
    [
     9,
     3
    ],
    [
     9,
     2
    ],
    [
     9,
     1
    ],
    [
     9,
     0
    ]
   ],
   "suggest_remove": [
    [
     9,
     6
    ]
   ],
   "model": "gemma4:31b"
  },
  "space": {
   "optimal": 33,
   "states": 56386,
   "dead_frac": 0.887,
   "optimal_lines": 433984320,
   "progress_frac": 0.326,
   "fatal_frac": 0.252,
   "fatal_merge_frac": 0.683,
   "forced_frac": 0.121,
   "survive_random": 0.0,
   "mean_branching": 9.85,
   "solvable_frac": 0.113
  },
  "id": "daily_2026-10-11_hard",
  "date": "2026-10-11",
  "band": "hard",
  "difficulty_score": 0.716,
  "optimal_len": 33,
  "title": "Oct 11",
  "rev": "7247a4ba"
 }
}