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{"type":"item.completed","item":{"id":"item_2","type":"agent_message","text":"```python\n# On a small board the central opening maximizes access to all four sides.\n# This opening prior is exactly zero as soon as any stone is present.\nw=load(\"L1.W\");b=load(\"L1.b\")\nw[:,493]=0\nfor r in range(9):\n    for c in range(9):\n        w[inp(r,c,0),493]=-1\n        w[inp(r,c,1),493]=-1\nb[493]=1\nsave(\"L1.W\",w);save(\"L1.b\",b)\nfor k in range(2,7):\n    w=load(f\"L{k}.W\")\n    w[:,493]=0;w[493,493]=1\n    save(f\"L{k}.W\",w)\nw=load(\"out.W\")\nfor q in range(81):\n    r,c=divmod(q,9)\n    w[493,q]=-3.6*(abs(r-4)+abs(c-4))\nsave(\"out.W\",w)\nprint(\"Added a central opening prior, active only on an empty board.\")\n```\n"}}
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