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{"type":"item.completed","item":{"id":"item_2","type":"agent_message","text":"```python\nimport numpy as np\n\n# Exact extra safety certificates:\n# three connected stones in a straight line whose two end stones each\n# have a liberty necessarily have at least TWO DISTINCT liberties.\n# Use spare units at a rotationally symmetric set of five board locations.\nslots=[486,487,488,489,491,492]+list(range(496,510))\ncenters=[(2,2),(2,6),(4,4),(6,2),(6,6)]\nw2=load(\"L2.W\");b2=load(\"L2.b\")\nw3=load(\"L3.W\")\nfor s in slots:\n    w2[:,s]=0;b2[s]=-2\n    w3[s,:486]=0\n\nn=0\nfor r,c in centers:\n    center=r*9+c\n    for dr,dc in ((0,1),(1,0)):\n        ends=[(r-dr)*9+c-dc,(r+dr)*9+c+dc]\n        for color,zch,start in ((0,3,2),(1,5,4)):\n            s=slots[n];n+=1\n            w2[color*81+center,s]=1\n            for v in ends:\n                w2[color*81+v,s]+=1\n                w2[zch*81+v,s]-=1\n            affected=[center]\n            for rr,cc in ((r-1,c),(r+1,c),(r,c-1),(r,c+1)):\n                if 0<=rr<9 and 0<=cc<9:affected.append(rr*9+cc)\n            for v in affected:\n                for cls in (0,1):\n                    w3[s,(start+cls)*81+v]-=1\nsave(\"L2.W\",w2);save(\"L2.b\",b2);save(\"L3.W\",w3)\nprint(\"Added 20 exact straight-chain safety certificates using spare units.\")\n```\n"}}
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