{"abstract":"A led ace loses to a deuce of the same suit.","category":"Card game rule engines","checks":8,"contract":"Input [cards_in_play_order, leader_seat, trump_or_None, seats]. The highest trump wins; with no trump played the highest card of the led suit wins (A high). Off-suit non-trump cards never win. Return the winning seat, counting clockwise from the leader.","contract_signature":"x","evaluation_group":"w2-card-game-rule-engines-trick-winner","failed_approach":"Reversing the rank string makes low cards win.","family":"w2-card-game-rule-engines-trick-winner-ace-rank","id":"FA-83356","implementations":{"attempt":{"sha256":"0552911381516ff0bf7370497291afc2f64fb4bdd8acaf2672c88aea82c011fc","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    cards, leader, trump, seats = x\n    order = '23456789TJQKA'[::-1]\n    best = 0\n    for i in range(1, len(cards)):\n        card, top = cards[i], cards[best]\n        if card[1] == top[1]:\n            if order.index(card[0]) > order.index(top[0]):\n                best = i\n        elif card[1] == trump:\n            best = i\n    return (leader + best) % seats\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[[['2H', '8D', 'TC', 'AH'], 2, 'S', 4], 1], [[['KC', 'AC', '8H', '8D'], 2, None, 4], 3], [[['3H', '9S', 'QD', '5H'], 3, 'D', 4], 1], [[['KD', '2H', '9D', '2D', '6C'], 4, None, 5], 4], [[['QH', '4D', 'TS', '5D', '2S'], 4, None, 5], 4], [[['8H', 'TS', '7D', 'JS'], 2, None, 4], 2], [[['8S', 'AD', 'KC'], 0, None, 3], 0], [[['9C', '7D', '8D', '2S', 'TD'], 4, 'D', 5], 3]], [[[['8C', '2C', '9D', '7C'], 1, None, 4], 1], [[['9C', '7D', '8D', '2S', 'TD'], 4, 'D', 5], 3], [[['JD', '2H', 'KD', '5D', 'QS'], 0, None, 5], 2], [[['2D', 'QC', '3S', '3H'], 3, 'S', 4], 1], [[['5C', '6H', '3C', 'AC'], 2, 'D', 4], 1], [[['4D', '6S', 'TH'], 2, 'D', 3], 2], [[['7H', '8D', 'AH', '5S', '6S'], 4, 'C', 5], 1], [[['TD', '5D', 'QS', 'AC', 'KS'], 1, None, 5], 1]], [[[['7H', '8D', 'AH', '5S', '6S'], 4, 'C', 5], 1], [[['5D', 'AD', '8H'], 1, None, 3], 2], [[['TD', '5D', 'QS', 'AC', 'KS'], 1, None, 5], 1], [[['8H', 'QC', 'JS'], 2, 'C', 3], 0], [[['KC', '6C', '4S'], 0, 'D', 3], 0], [[['3S', '6C', 'QS'], 0, 'S', 3], 2], [[['3D', 'QD', '8S', '6D', 'TS'], 2, None, 5], 3], [[['8C', '8S', 'AC'], 1, None, 3], 0]], [[[['8S', '5S', 'KS'], 2, 'H', 3], 1], [[['3D', 'QD', '8S', '6D', 'TS'], 2, None, 5], 3], [[['6D', '2H', '4D', '5S', '7S'], 4, 'H', 5], 0], [[['8C', '5H', '6H', '9C'], 2, None, 4], 1], [[['AH', 'TD', '4H', '3S', 'KD'], 1, None, 5], 1], [[['6H', 'AS', '7H', 'JD'], 2, 'D', 4], 1], [[['8C', '8S', 'AC'], 1, None, 3], 0], [[['QC', '9S', 'AC'], 1, None, 3], 0]], [[[['7S', '4S', '8D'], 1, 'S', 3], 1], [[['3S', 'JS', 'TC', '5D', '3H'], 2, 'D', 5], 0], [[['9H', '6H', '3D'], 1, 'S', 3], 1], [[['3H', '8D', '3C'], 0, 'H', 3], 0], [[['AD', 'JH', '8D', '5D'], 1, 'H', 4], 2], [[['8C', '8S', 'AC'], 1, None, 3], 0], [[['AH', '4H', '7S', 'JH'], 2, 'H', 4], 2], [[['5S', '8H', '4D', 'AS'], 0, 'S', 4], 3]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"trick 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":"e979083e03263de309ac2b9e15922bacde278116de983ef19b235a799aea28c9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    cards, leader, trump, seats = x\n    order = 'A23456789TJQK'\n    best = 0\n    for i in range(1, len(cards)):\n        card, top = cards[i], cards[best]\n        if card[1] == top[1]:\n            if order.index(card[0]) > order.index(top[0]):\n                best = i\n        elif card[1] == trump:\n            best = i\n    return (leader + best) % seats\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[[['2H', '8D', 'TC', 'AH'], 2, 'S', 4], 1], [[['KC', 'AC', '8H', '8D'], 2, None, 4], 3], [[['3H', '9S', 'QD', '5H'], 3, 'D', 4], 1], [[['KD', '2H', '9D', '2D', '6C'], 4, None, 5], 4], [[['QH', '4D', 'TS', '5D', '2S'], 4, None, 5], 4], [[['8H', 'TS', '7D', 'JS'], 2, None, 4], 2], [[['8S', 'AD', 'KC'], 0, None, 3], 0], [[['9C', '7D', '8D', '2S', 'TD'], 4, 'D', 5], 3]], [[[['8C', '2C', '9D', '7C'], 1, None, 4], 1], [[['9C', '7D', '8D', '2S', 'TD'], 4, 'D', 5], 3], [[['JD', '2H', 'KD', '5D', 'QS'], 0, None, 5], 2], [[['2D', 'QC', '3S', '3H'], 3, 'S', 4], 1], [[['5C', '6H', '3C', 'AC'], 2, 'D', 4], 1], [[['4D', '6S', 'TH'], 2, 'D', 3], 2], [[['7H', '8D', 'AH', '5S', '6S'], 4, 'C', 5], 1], [[['TD', '5D', 'QS', 'AC', 'KS'], 1, None, 5], 1]], [[[['7H', '8D', 'AH', '5S', '6S'], 4, 'C', 5], 1], [[['5D', 'AD', '8H'], 1, None, 3], 2], [[['TD', '5D', 'QS', 'AC', 'KS'], 1, None, 5], 1], [[['8H', 'QC', 'JS'], 2, 'C', 3], 0], [[['KC', '6C', '4S'], 0, 'D', 3], 0], [[['3S', '6C', 'QS'], 0, 'S', 3], 2], [[['3D', 'QD', '8S', '6D', 'TS'], 2, None, 5], 3], [[['8C', '8S', 'AC'], 1, None, 3], 0]], [[[['8S', '5S', 'KS'], 2, 'H', 3], 1], [[['3D', 'QD', '8S', '6D', 'TS'], 2, None, 5], 3], [[['6D', '2H', '4D', '5S', '7S'], 4, 'H', 5], 0], [[['8C', '5H', '6H', '9C'], 2, None, 4], 1], [[['AH', 'TD', '4H', '3S', 'KD'], 1, None, 5], 1], [[['6H', 'AS', '7H', 'JD'], 2, 'D', 4], 1], [[['8C', '8S', 'AC'], 1, None, 3], 0], [[['QC', '9S', 'AC'], 1, None, 3], 0]], [[[['7S', '4S', '8D'], 1, 'S', 3], 1], [[['3S', 'JS', 'TC', '5D', '3H'], 2, 'D', 5], 0], [[['9H', '6H', '3D'], 1, 'S', 3], 1], [[['3H', '8D', '3C'], 0, 'H', 3], 0], [[['AD', 'JH', '8D', '5D'], 1, 'H', 4], 2], [[['8C', '8S', 'AC'], 1, None, 3], 0], [[['AH', '4H', '7S', 'JH'], 2, 'H', 4], 2], [[['5S', '8H', '4D', 'AS'], 0, 'S', 4], 3]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"trick 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":"A bounded toy rule contract stated explicitly in the contract field; cards are two-character codes (rank, suit). Not a complete implementation of any published rulebook or casino table rules. 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-card-game-rule-engines-trick-winner-ace-rank","generated_at":"2026-09-29T14:50:20.746035+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Card-game engines, scoring apps and online tables apply this rule automatically on every hand.","root_cause":"The rank string starts with A.","sha256":"9cb1b30a1123bc584e8286258114f4ab9adeaf4d664f532c3916bf72fc136019","title":"Aces rank low in trick comparison · 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":40.672,"exit_code":1,"observations":[{"actual":2,"check":"trick case 0","expected":1,"passed":false},{"actual":2,"check":"trick case 1","expected":3,"passed":false},{"actual":1,"check":"trick case 2","expected":1,"passed":true},{"actual":2,"check":"trick case 3","expected":4,"passed":false},{"actual":4,"check":"trick case 4","expected":4,"passed":true},{"actual":2,"check":"trick case 5","expected":2,"passed":true},{"actual":0,"check":"trick case 6","expected":0,"passed":true},{"actual":0,"check":"trick case 7","expected":3,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"trick case 0\", \"actual\": 2, \"expected\": 1, \"passed\": false}, {\"check\": \"trick case 1\", \"actual\": 2, \"expected\": 3, \"passed\": false}, {\"check\": \"trick case 2\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"trick case 3\", \"actual\": 2, \"expected\": 4, \"passed\": false}, {\"check\": \"trick case 4\", \"actual\": 4, \"expected\": 4, \"passed\": true}, {\"check\": \"trick case 5\", \"actual\": 2, \"expected\": 2, \"passed\": true}, {\"check\": \"trick case 6\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"trick case 7\", \"actual\": 0, \"expected\": 3, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":42.238,"exit_code":1,"observations":[{"actual":2,"check":"trick case 0","expected":1,"passed":false},{"actual":2,"check":"trick case 1","expected":3,"passed":false},{"actual":1,"check":"trick case 2","expected":1,"passed":true},{"actual":4,"check":"trick case 3","expected":4,"passed":true},{"actual":4,"check":"trick case 4","expected":4,"passed":true},{"actual":2,"check":"trick case 5","expected":2,"passed":true},{"actual":0,"check":"trick case 6","expected":0,"passed":true},{"actual":3,"check":"trick case 7","expected":3,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"trick case 0\", \"actual\": 2, \"expected\": 1, \"passed\": false}, {\"check\": \"trick case 1\", \"actual\": 2, \"expected\": 3, \"passed\": false}, {\"check\": \"trick case 2\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"trick case 3\", \"actual\": 4, \"expected\": 4, \"passed\": true}, {\"check\": \"trick case 4\", \"actual\": 4, \"expected\": 4, \"passed\": true}, {\"check\": \"trick case 5\", \"actual\": 2, \"expected\": 2, \"passed\": true}, {\"check\": \"trick case 6\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"trick case 7\", \"actual\": 3, \"expected\": 3, \"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."}}