{"abstract":"Adjacent seed placement makes top seeds meet early.","category":"Tournament pairing rules","checks":6,"contract":"Synthetic model: For size a positive power of two, start with [1] and repeatedly replace each seed s by [s,2*current_length+1-s]; add offset to each slot label.","contract_signature":"size, offset","evaluation_group":"model-5b8e648736954f43","failed_approach":"Pairing high and low seeds protects the first round but places seeds one and two in the same half.","family":"z-tournament_pairing-bracket-seeding","id":"FA-12821","implementations":{"attempt":{"sha256":"b4bb46b7a246037e020ef4942cd19e2de7bc8c972d1dce760ba06fc585c99e50","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(size, offset):\n    return [offset+x for i in range(1,size//2+1) for x in (i,size+1-i)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('one', solve(1,N), [N+1])\ncheck('two', solve(2,N), [N+1,N+2])\ncheck('four', solve(4,N), [N+1,N+4,N+2,N+3])\ncheck('eight', solve(8,N), [N+1,N+8,N+4,N+5,N+2,N+7,N+3,N+6])\ncheck('zero offset', solve(4,0), [1,4,2,3])\ncheck('negative offset', solve(4,-N), [1-N,4-N,2-N,3-N])\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":"3badee87c98be20bd519244c5270c91c7ede7e20d33cc3cb3d7feb4d2cc0fa04","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(size, offset):\n    return list(range(offset+1,offset+size+1))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('one', solve(1,N), [N+1])\ncheck('two', solve(2,N), [N+1,N+2])\ncheck('four', solve(4,N), [N+1,N+4,N+2,N+3])\ncheck('eight', solve(8,N), [N+1,N+8,N+4,N+5,N+2,N+7,N+3,N+6])\ncheck('zero offset', solve(4,0), [1,4,2,3])\ncheck('negative offset', solve(4,-N), [1-N,4-N,2-N,3-N])\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":"Controlled synthetic policy; does not implement an entire tournament system. 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":"z-tournament_pairing-bracket-seeding","generated_at":"2026-09-29T14:39:00.522466+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Makes the stated pairing or standings policy executable without assuming any real federation rulebook.","root_cause":"Seed order is copied directly into adjacent match slots.","sha256":"cf6ac8accfb0163a6d5187449100b2a9065805b75b95b6a15e4f949f4ea6748d","title":"Adjacent seed placement makes top seeds meet early · 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":42.291,"exit_code":1,"observations":[{"actual":[],"check":"one","expected":[2],"passed":false},{"actual":[2,3],"check":"two","expected":[2,3],"passed":true},{"actual":[2,5,3,4],"check":"four","expected":[2,5,3,4],"passed":true},{"actual":[2,9,3,8,4,7,5,6],"check":"eight","expected":[2,9,5,6,3,8,4,7],"passed":false},{"actual":[1,4,2,3],"check":"zero offset","expected":[1,4,2,3],"passed":true},{"actual":[0,3,1,2],"check":"negative offset","expected":[0,3,1,2],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"one\", \"actual\": [], \"expected\": [2], \"passed\": false}, {\"check\": \"two\", \"actual\": [2, 3], \"expected\": [2, 3], \"passed\": true}, {\"check\": \"four\", \"actual\": [2, 5, 3, 4], \"expected\": [2, 5, 3, 4], \"passed\": true}, {\"check\": \"eight\", \"actual\": [2, 9, 3, 8, 4, 7, 5, 6], \"expected\": [2, 9, 5, 6, 3, 8, 4, 7], \"passed\": false}, {\"check\": \"zero offset\", \"actual\": [1, 4, 2, 3], \"expected\": [1, 4, 2, 3], \"passed\": true}, {\"check\": \"negative offset\", \"actual\": [0, 3, 1, 2], \"expected\": [0, 3, 1, 2], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":44.5,"exit_code":1,"observations":[{"actual":[2],"check":"one","expected":[2],"passed":true},{"actual":[2,3],"check":"two","expected":[2,3],"passed":true},{"actual":[2,3,4,5],"check":"four","expected":[2,5,3,4],"passed":false},{"actual":[2,3,4,5,6,7,8,9],"check":"eight","expected":[2,9,5,6,3,8,4,7],"passed":false},{"actual":[1,2,3,4],"check":"zero offset","expected":[1,4,2,3],"passed":false},{"actual":[0,1,2,3],"check":"negative offset","expected":[0,3,1,2],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"one\", \"actual\": [2], \"expected\": [2], \"passed\": true}, {\"check\": \"two\", \"actual\": [2, 3], \"expected\": [2, 3], \"passed\": true}, {\"check\": \"four\", \"actual\": [2, 3, 4, 5], \"expected\": [2, 5, 3, 4], \"passed\": false}, {\"check\": \"eight\", \"actual\": [2, 3, 4, 5, 6, 7, 8, 9], \"expected\": [2, 9, 5, 6, 3, 8, 4, 7], \"passed\": false}, {\"check\": \"zero offset\", \"actual\": [1, 2, 3, 4], \"expected\": [1, 4, 2, 3], \"passed\": false}, {\"check\": \"negative offset\", \"actual\": [0, 1, 2, 3], \"expected\": [0, 3, 1, 2], \"passed\": false}], \"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."}}