{"abstract":"A player passing twice in a row (e.g. during free placement) ends the game.","category":"Go territory scoring","checks":8,"contract":"Input list of \"C:action\" tokens. Two consecutive passes by different players end the game [\"score\", None, index]; any board move clears a pending pass; \"resign\"/\"timeout\" end it with the opponent as winner [\"resign\"/\"time\", winner, index]. Otherwise [\"playing\", None, len(moves)].","contract_signature":"x","evaluation_group":"w2-go-territory-scoring-game-end","failed_approach":"Requiring at least two earlier moves rejects an immediate pass-pass ending.","family":"w2-go-territory-scoring-game-end-same-player-passes","id":"FA-83231","implementations":{"attempt":{"sha256":"55109d83b978d87f391f99e9c46245fc262179539a5c627a46476ab9d123ff7e","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    moves = x\n    prev_pass = None\n    for idx, mv in enumerate(moves):\n        who, _, act = mv.partition(':')\n        other = 'W' if who == 'B' else 'B'\n        if act == 'resign':\n            return ['resign', other, idx]\n        if act == 'timeout':\n            return ['time', other, idx]\n        if act == 'pass':\n            if prev_pass is not None and prev_pass != who and idx >= 2:\n                return ['score', None, idx]\n            prev_pass = who\n        else:\n            prev_pass = None\n    return ['playing', None, len(moves)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[['W:qq', 'W:dd', 'W:pass', 'W:pass'], ['playing', None, 4]], [['B:resign', 'W:pass', 'W:resign', 'B:resign', 'B:qq', 'W:cc'], ['resign', 'W', 0]], [['B:timeout', 'W:pass', 'B:cc', 'B:cc'], ['time', 'W', 0]], [['B:timeout', 'W:pass', 'W:pass', 'W:pass'], ['time', 'W', 0]], [['B:timeout', 'W:cc'], ['time', 'W', 0]], [['B:timeout', 'W:resign'], ['time', 'W', 0]], [['B:pass'], ['playing', None, 1]], [['B:pass', 'W:pass', 'B:pass', 'W:resign', 'B:pass', 'W:dd'], ['score', None, 1]]], [[['B:pass', 'W:dd'], ['playing', None, 2]], [['W:cc', 'B:pass', 'B:dd', 'W:cc', 'B:resign'], ['resign', 'W', 4]], [['B:pass'], ['playing', None, 1]], [['B:resign'], ['resign', 'W', 0]], [['B:resign', 'B:cc', 'W:timeout', 'W:pass', 'B:cc'], ['resign', 'W', 0]], [['B:cc', 'W:pass', 'B:dd', 'B:resign'], ['resign', 'W', 3]], [['B:pass', 'B:pass'], ['playing', None, 2]], [['B:pass', 'W:pass'], ['score', None, 1]]], [[['B:pass', 'W:qq'], ['playing', None, 2]], [['B:resign', 'W:pass'], ['resign', 'W', 0]], [['B:pass', 'W:cc', 'W:pass', 'B:cc'], ['playing', None, 4]], [['B:pass', 'W:qq'], ['playing', None, 2]], [['B:pass', 'B:dd', 'B:qq'], ['playing', None, 3]], [['W:pass'], ['playing', None, 1]], [['B:pass', 'B:pass', 'B:qq', 'W:pass'], ['playing', None, 4]], [['B:pass', 'W:pass', 'B:pass', 'W:timeout'], ['score', None, 1]]], [[['B:resign', 'W:pass', 'B:pass', 'W:dd'], ['resign', 'W', 0]], [['B:pass', 'W:qq', 'B:resign', 'W:pass', 'B:resign'], ['resign', 'W', 2]], [['B:dd', 'W:pass', 'B:pass', 'W:cc', 'B:cc'], ['score', None, 2]], [['B:dd', 'W:resign', 'B:dd', 'W:dd'], ['resign', 'B', 1]], [['W:qq', 'W:timeout', 'B:dd', 'W:pass', 'B:cc', 'W:qq'], ['time', 'B', 1]], [['B:dd'], ['playing', None, 1]], [['B:pass', 'W:pass', 'B:pass', 'B:dd', 'B:cc', 'W:timeout'], ['score', None, 1]], [['B:qq', 'B:pass', 'B:pass', 'W:pass'], ['score', None, 3]]], [[['W:cc', 'W:resign'], ['resign', 'B', 1]], [['B:dd', 'B:cc', 'B:cc', 'W:resign'], ['resign', 'B', 3]], [['W:pass', 'B:timeout', 'B:cc', 'W:dd'], ['time', 'W', 1]], [['B:timeout'], ['time', 'W', 0]], [['B:pass', 'W:pass', 'B:pass', 'W:resign', 'B:pass', 'W:dd'], ['score', None, 1]], [['W:timeout', 'W:cc', 'B:cc', 'W:pass', 'B:dd', 'W:qq'], ['time', 'B', 0]], [['B:pass', 'W:pass', 'B:resign', 'W:pass', 'B:pass', 'B:dd'], ['score', None, 1]], [['B:qq', 'W:qq', 'B:pass', 'B:pass', 'B:timeout', 'B:cc'], ['time', 'W', 4]]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"game end case %d\" % i, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"1d52c25195abad31c9ed90f3caa5c6b85a427f3d1ef90b3b7adbfa5eceb02f2e","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    moves = x\n    prev_pass = None\n    for idx, mv in enumerate(moves):\n        who, _, act = mv.partition(':')\n        other = 'W' if who == 'B' else 'B'\n        if act == 'resign':\n            return ['resign', other, idx]\n        if act == 'timeout':\n            return ['time', other, idx]\n        if act == 'pass':\n            if prev_pass is not None:\n                return ['score', None, idx]\n            prev_pass = who\n        else:\n            prev_pass = None\n    return ['playing', None, len(moves)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[['W:qq', 'W:dd', 'W:pass', 'W:pass'], ['playing', None, 4]], [['B:resign', 'W:pass', 'W:resign', 'B:resign', 'B:qq', 'W:cc'], ['resign', 'W', 0]], [['B:timeout', 'W:pass', 'B:cc', 'B:cc'], ['time', 'W', 0]], [['B:timeout', 'W:pass', 'W:pass', 'W:pass'], ['time', 'W', 0]], [['B:timeout', 'W:cc'], ['time', 'W', 0]], [['B:timeout', 'W:resign'], ['time', 'W', 0]], [['B:pass'], ['playing', None, 1]], [['B:pass', 'W:pass', 'B:pass', 'W:resign', 'B:pass', 'W:dd'], ['score', None, 1]]], [[['B:pass', 'W:dd'], ['playing', None, 2]], [['W:cc', 'B:pass', 'B:dd', 'W:cc', 'B:resign'], ['resign', 'W', 4]], [['B:pass'], ['playing', None, 1]], [['B:resign'], ['resign', 'W', 0]], [['B:resign', 'B:cc', 'W:timeout', 'W:pass', 'B:cc'], ['resign', 'W', 0]], [['B:cc', 'W:pass', 'B:dd', 'B:resign'], ['resign', 'W', 3]], [['B:pass', 'B:pass'], ['playing', None, 2]], [['B:pass', 'W:pass'], ['score', None, 1]]], [[['B:pass', 'W:qq'], ['playing', None, 2]], [['B:resign', 'W:pass'], ['resign', 'W', 0]], [['B:pass', 'W:cc', 'W:pass', 'B:cc'], ['playing', None, 4]], [['B:pass', 'W:qq'], ['playing', None, 2]], [['B:pass', 'B:dd', 'B:qq'], ['playing', None, 3]], [['W:pass'], ['playing', None, 1]], [['B:pass', 'B:pass', 'B:qq', 'W:pass'], ['playing', None, 4]], [['B:pass', 'W:pass', 'B:pass', 'W:timeout'], ['score', None, 1]]], [[['B:resign', 'W:pass', 'B:pass', 'W:dd'], ['resign', 'W', 0]], [['B:pass', 'W:qq', 'B:resign', 'W:pass', 'B:resign'], ['resign', 'W', 2]], [['B:dd', 'W:pass', 'B:pass', 'W:cc', 'B:cc'], ['score', None, 2]], [['B:dd', 'W:resign', 'B:dd', 'W:dd'], ['resign', 'B', 1]], [['W:qq', 'W:timeout', 'B:dd', 'W:pass', 'B:cc', 'W:qq'], ['time', 'B', 1]], [['B:dd'], ['playing', None, 1]], [['B:pass', 'W:pass', 'B:pass', 'B:dd', 'B:cc', 'W:timeout'], ['score', None, 1]], [['B:qq', 'B:pass', 'B:pass', 'W:pass'], ['score', None, 3]]], [[['W:cc', 'W:resign'], ['resign', 'B', 1]], [['B:dd', 'B:cc', 'B:cc', 'W:resign'], ['resign', 'B', 3]], [['W:pass', 'B:timeout', 'B:cc', 'W:dd'], ['time', 'W', 1]], [['B:timeout'], ['time', 'W', 0]], [['B:pass', 'W:pass', 'B:pass', 'W:resign', 'B:pass', 'W:dd'], ['score', None, 1]], [['W:timeout', 'W:cc', 'B:cc', 'W:pass', 'B:dd', 'W:qq'], ['time', 'B', 0]], [['B:pass', 'W:pass', 'B:resign', 'W:pass', 'B:pass', 'B:dd'], ['score', None, 1]], [['B:qq', 'W:qq', 'B:pass', 'B:pass', 'B:timeout', 'B:cc'], ['time', 'W', 4]]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"game end case %d\" % i, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Small rectangular toy boards given as strings of B, W and dot; a bounded teaching model of one scoring or bookkeeping rule, not a complete rules engine or server implementation. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-go-territory-scoring-game-end-same-player-passes","generated_at":"2026-09-29T14:50:19.623523+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Go servers and scoring tools compute this value automatically; a wrong answer changes a game result.","root_cause":"The end test only requires any pending pass.","sha256":"6b31fdc1c10e9b9d24e7543e0627018aa0c879f874d700ab5f7b8e88c6aaaddd","title":"Two passes by the same player end the game · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":40.977,"exit_code":1,"observations":[{"actual":["playing",null,4],"check":"game end case 0","expected":["playing",null,4],"passed":true},{"actual":["resign","W",0],"check":"game end case 1","expected":["resign","W",0],"passed":true},{"actual":["time","W",0],"check":"game end case 2","expected":["time","W",0],"passed":true},{"actual":["time","W",0],"check":"game end case 3","expected":["time","W",0],"passed":true},{"actual":["time","W",0],"check":"game end case 4","expected":["time","W",0],"passed":true},{"actual":["time","W",0],"check":"game end case 5","expected":["time","W",0],"passed":true},{"actual":["playing",null,1],"check":"game end case 6","expected":["playing",null,1],"passed":true},{"actual":["score",null,2],"check":"game end case 7","expected":["score",null,1],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"game end case 0\", \"actual\": [\"playing\", null, 4], \"expected\": [\"playing\", null, 4], \"passed\": true}, {\"check\": \"game end case 1\", \"actual\": [\"resign\", \"W\", 0], \"expected\": [\"resign\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 2\", \"actual\": [\"time\", \"W\", 0], \"expected\": [\"time\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 3\", \"actual\": [\"time\", \"W\", 0], \"expected\": [\"time\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 4\", \"actual\": [\"time\", \"W\", 0], \"expected\": [\"time\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 5\", \"actual\": [\"time\", \"W\", 0], \"expected\": [\"time\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 6\", \"actual\": [\"playing\", null, 1], \"expected\": [\"playing\", null, 1], \"passed\": true}, {\"check\": \"game end case 7\", \"actual\": [\"score\", null, 2], \"expected\": [\"score\", null, 1], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.158,"exit_code":1,"observations":[{"actual":["score",null,3],"check":"game end case 0","expected":["playing",null,4],"passed":false},{"actual":["resign","W",0],"check":"game end case 1","expected":["resign","W",0],"passed":true},{"actual":["time","W",0],"check":"game end case 2","expected":["time","W",0],"passed":true},{"actual":["time","W",0],"check":"game end case 3","expected":["time","W",0],"passed":true},{"actual":["time","W",0],"check":"game end case 4","expected":["time","W",0],"passed":true},{"actual":["time","W",0],"check":"game end case 5","expected":["time","W",0],"passed":true},{"actual":["playing",null,1],"check":"game end case 6","expected":["playing",null,1],"passed":true},{"actual":["score",null,1],"check":"game end case 7","expected":["score",null,1],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"game end case 0\", \"actual\": [\"score\", null, 3], \"expected\": [\"playing\", null, 4], \"passed\": false}, {\"check\": \"game end case 1\", \"actual\": [\"resign\", \"W\", 0], \"expected\": [\"resign\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 2\", \"actual\": [\"time\", \"W\", 0], \"expected\": [\"time\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 3\", \"actual\": [\"time\", \"W\", 0], \"expected\": [\"time\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 4\", \"actual\": [\"time\", \"W\", 0], \"expected\": [\"time\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 5\", \"actual\": [\"time\", \"W\", 0], \"expected\": [\"time\", \"W\", 0], \"passed\": true}, {\"check\": \"game end case 6\", \"actual\": [\"playing\", null, 1], \"expected\": [\"playing\", null, 1], \"passed\": true}, {\"check\": \"game end case 7\", \"actual\": [\"score\", null, 1], \"expected\": [\"score\", null, 1], \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}