{
 "grid_size": 9,
 "polyominos": [
  {
   "tiles": [
    [
     0,
     5
    ],
    [
     0,
     6
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 0,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     7,
     1
    ],
    [
     7,
     2
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 1,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     0,
     0
    ],
    [
     1,
     0
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 2,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     4,
     0
    ],
    [
     5,
     0
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 3,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     6,
     4
    ],
    [
     6,
     5
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 4,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     0,
     1
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     1
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     2
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     2
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     3,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     3,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     3,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     0
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     8
    ]
   ],
   "piece_type": "BARRIER"
  }
 ],
 "level_color": [
  100,
  0,
  100
 ],
 "meta": {
  "generator": "mutate_harden",
  "preset": "9x9/5",
  "tier": "hard",
  "seed_optimal": 12,
  "harden_seconds": 72,
  "harden_restarts": 1,
  "hard_target": 37,
  "soft_flaws": [
   "all 5 pieces the same size (2)"
  ],
  "hard_flaws": [],
  "beautify": {
   "removed": 0,
   "filled": 3
  },
  "taste": {
   "score": 2,
   "verdict": "tidy",
   "summary": "The board has a strong central wall structure, but is cluttered with several single-cell barrier fragments that look accidental.",
   "issues": [
    {
     "kind": "random_dot",
     "cells": [
      [
       6,
       6
      ]
     ],
     "note": "Lone barrier island floating in the lower-right quadrant."
    },
    {
     "kind": "ragged_shell",
     "cells": [
      [
       8,
       4
      ]
     ],
     "note": "Single barrier cell on the right edge creates a small notch."
    },
    {
     "kind": "ragged_shell",
     "cells": [
      [
       4,
       8
      ]
     ],
     "note": "Single barrier cell on the bottom edge creates a small notch."
    },
    {
     "kind": "ragged_shell",
     "cells": [
      [
       6,
       0
      ]
     ],
     "note": "Single barrier cell on the top edge creates a small notch."
    }
   ],
   "suggest_fill": [],
   "suggest_remove": [
    [
     6,
     6
    ],
    [
     8,
     4
    ],
    [
     4,
     8
    ],
    [
     6,
     0
    ]
   ],
   "model": "gemma4:31b"
  },
  "space": {
   "optimal": 39,
   "states": 43462,
   "dead_frac": 0.851,
   "optimal_lines": 1779960,
   "progress_frac": 0.195,
   "fatal_frac": 0.183,
   "fatal_merge_frac": 0.904,
   "forced_frac": 0.744,
   "survive_random": 0.0007,
   "mean_branching": 6.72,
   "solvable_frac": 0.149
  },
  "id": "daily_2026-10-15_hard",
  "date": "2026-10-15",
  "band": "hard",
  "difficulty_score": 0.825,
  "optimal_len": 39,
  "title": "Oct 15",
  "rev": "134842e4"
 }
}