{"abstract":"After a draw two the victim plays immediately.","category":"Card game rule engines","checks":8,"contract":"Input [players, current, direction(+1/-1), card]. Reverse flips direction (with two players it acts as skip); skip jumps one player; draw2/wild4 make the next player draw 2/4 and lose their turn. Return [next_player, direction, draw_count, victim_or_None].","contract_signature":"x","evaluation_group":"w2-card-game-rule-engines-uno-turn","failed_approach":"Skipping only on wild draw four lets draw-two victims play.","family":"w2-card-game-rule-engines-uno-turn-draw-penalty-skip","id":"FA-83526","implementations":{"attempt":{"sha256":"71d2f207a2bc47d0ee22932e3a8521121491dce108a381f5a04e5d2dc9f2ecb1","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    n, cur, direction, card = x\n    step = 1\n    victim = None\n    draw = 0\n    if card == 'reverse':\n        direction = -direction\n        if n == 2:\n            step = 2\n    elif card == 'skip':\n        step = 2\n    elif card in ('draw2', 'wild4'):\n        victim = (cur + direction) % n\n        draw = 2 if card == 'draw2' else 4\n        step = 2 if card == 'wild4' else 1\n    nxt = (cur + direction * step) % n\n    return [nxt, direction, draw, victim]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[[2, 0, 1, 'draw2'], [0, 1, 2, 1]], [[2, 1, 1, 'wild4'], [1, 1, 4, 0]], [[2, 1, -1, 'skip'], [1, -1, 0, None]], [[2, 1, -1, 'wild'], [0, -1, 0, None]], [[3, 0, 1, 'draw2'], [2, 1, 2, 1]], [[3, 0, 1, 'wild'], [1, 1, 0, None]], [[3, 0, 1, 'wild4'], [2, 1, 4, 1]], [[4, 2, -1, 'draw2'], [0, -1, 2, 1]]], [[[3, 0, 1, 'draw2'], [2, 1, 2, 1]], [[3, 0, -1, 'reverse'], [1, 1, 0, None]], [[3, 0, -1, 'wild'], [2, -1, 0, None]], [[3, 0, -1, 'wild4'], [1, -1, 4, 2]], [[3, 1, 1, 'num'], [2, 1, 0, None]], [[3, 1, 1, 'skip'], [0, 1, 0, None]], [[3, 1, 1, 'wild'], [2, 1, 0, None]], [[5, 3, 1, 'draw2'], [0, 1, 2, 4]]], [[[3, 1, 1, 'wild4'], [0, 1, 4, 2]], [[3, 1, -1, 'num'], [0, -1, 0, None]], [[3, 1, -1, 'skip'], [2, -1, 0, None]], [[3, 1, -1, 'reverse'], [2, 1, 0, None]], [[3, 1, -1, 'wild4'], [2, -1, 4, 0]], [[3, 2, 1, 'skip'], [1, 1, 0, None]], [[3, 2, 1, 'draw2'], [1, 1, 2, 0]], [[6, 3, -1, 'draw2'], [1, -1, 2, 2]]], [[[3, 2, 1, 'draw2'], [1, 1, 2, 0]], [[3, 2, 1, 'wild4'], [1, 1, 4, 0]], [[3, 2, -1, 'reverse'], [0, 1, 0, None]], [[3, 2, -1, 'wild4'], [0, -1, 4, 1]], [[4, 0, 1, 'num'], [1, 1, 0, None]], [[4, 0, 1, 'skip'], [2, 1, 0, None]], [[4, 0, 1, 'reverse'], [3, -1, 0, None]], [[4, 0, 1, 'wild'], [1, 1, 0, None]]], [[[4, 0, 1, 'wild'], [1, 1, 0, None]], [[4, 0, 1, 'wild4'], [2, 1, 4, 1]], [[4, 0, -1, 'num'], [3, -1, 0, None]], [[4, 0, -1, 'skip'], [2, -1, 0, None]], [[4, 0, -1, 'wild4'], [2, -1, 4, 3]], [[4, 1, 1, 'num'], [2, 1, 0, None]], [[4, 1, 1, 'skip'], [3, 1, 0, None]], [[5, 0, 1, 'draw2'], [2, 1, 2, 1]]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"turn 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":"e52ecff65547e482afb657faedabf811527a13b7aef0ea3129f1d0a5c90098dd","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    n, cur, direction, card = x\n    step = 1\n    victim = None\n    draw = 0\n    if card == 'reverse':\n        direction = -direction\n        if n == 2:\n            step = 2\n    elif card == 'skip':\n        step = 2\n    elif card in ('draw2', 'wild4'):\n        victim = (cur + direction) % n\n        draw = 2 if card == 'draw2' else 4\n        step = 1\n    nxt = (cur + direction * step) % n\n    return [nxt, direction, draw, victim]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[[[2, 0, 1, 'draw2'], [0, 1, 2, 1]], [[2, 1, 1, 'wild4'], [1, 1, 4, 0]], [[2, 1, -1, 'skip'], [1, -1, 0, None]], [[2, 1, -1, 'wild'], [0, -1, 0, None]], [[3, 0, 1, 'draw2'], [2, 1, 2, 1]], [[3, 0, 1, 'wild'], [1, 1, 0, None]], [[3, 0, 1, 'wild4'], [2, 1, 4, 1]], [[4, 2, -1, 'draw2'], [0, -1, 2, 1]]], [[[3, 0, 1, 'draw2'], [2, 1, 2, 1]], [[3, 0, -1, 'reverse'], [1, 1, 0, None]], [[3, 0, -1, 'wild'], [2, -1, 0, None]], [[3, 0, -1, 'wild4'], [1, -1, 4, 2]], [[3, 1, 1, 'num'], [2, 1, 0, None]], [[3, 1, 1, 'skip'], [0, 1, 0, None]], [[3, 1, 1, 'wild'], [2, 1, 0, None]], [[5, 3, 1, 'draw2'], [0, 1, 2, 4]]], [[[3, 1, 1, 'wild4'], [0, 1, 4, 2]], [[3, 1, -1, 'num'], [0, -1, 0, None]], [[3, 1, -1, 'skip'], [2, -1, 0, None]], [[3, 1, -1, 'reverse'], [2, 1, 0, None]], [[3, 1, -1, 'wild4'], [2, -1, 4, 0]], [[3, 2, 1, 'skip'], [1, 1, 0, None]], [[3, 2, 1, 'draw2'], [1, 1, 2, 0]], [[6, 3, -1, 'draw2'], [1, -1, 2, 2]]], [[[3, 2, 1, 'draw2'], [1, 1, 2, 0]], [[3, 2, 1, 'wild4'], [1, 1, 4, 0]], [[3, 2, -1, 'reverse'], [0, 1, 0, None]], [[3, 2, -1, 'wild4'], [0, -1, 4, 1]], [[4, 0, 1, 'num'], [1, 1, 0, None]], [[4, 0, 1, 'skip'], [2, 1, 0, None]], [[4, 0, 1, 'reverse'], [3, -1, 0, None]], [[4, 0, 1, 'wild'], [1, 1, 0, None]]], [[[4, 0, 1, 'wild'], [1, 1, 0, None]], [[4, 0, 1, 'wild4'], [2, 1, 4, 1]], [[4, 0, -1, 'num'], [3, -1, 0, None]], [[4, 0, -1, 'skip'], [2, -1, 0, None]], [[4, 0, -1, 'wild4'], [2, -1, 4, 3]], [[4, 1, 1, 'num'], [2, 1, 0, None]], [[4, 1, 1, 'skip'], [3, 1, 0, None]], [[5, 0, 1, 'draw2'], [2, 1, 2, 1]]]]\nfor i, (args, expected) in enumerate(fixtures[N-1]):\n    check(\"turn 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-uno-turn-draw-penalty-skip","generated_at":"2026-09-29T14:50:22.460705+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 draw branch advances one seat.","sha256":"57dcff0329642522755b900f9022f7d23b73d7c83e812fe8f7e2be006a491caf","title":"The draw victim still takes a turn · 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":39.391,"exit_code":1,"observations":[{"actual":[1,1,2,1],"check":"turn case 0","expected":[0,1,2,1],"passed":false},{"actual":[1,1,4,0],"check":"turn case 1","expected":[1,1,4,0],"passed":true},{"actual":[1,-1,0,null],"check":"turn case 2","expected":[1,-1,0,null],"passed":true},{"actual":[0,-1,0,null],"check":"turn case 3","expected":[0,-1,0,null],"passed":true},{"actual":[1,1,2,1],"check":"turn case 4","expected":[2,1,2,1],"passed":false},{"actual":[1,1,0,null],"check":"turn case 5","expected":[1,1,0,null],"passed":true},{"actual":[2,1,4,1],"check":"turn case 6","expected":[2,1,4,1],"passed":true},{"actual":[1,-1,2,1],"check":"turn case 7","expected":[0,-1,2,1],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"turn case 0\", \"actual\": [1, 1, 2, 1], \"expected\": [0, 1, 2, 1], \"passed\": false}, {\"check\": \"turn case 1\", \"actual\": [1, 1, 4, 0], \"expected\": [1, 1, 4, 0], \"passed\": true}, {\"check\": \"turn case 2\", \"actual\": [1, -1, 0, null], \"expected\": [1, -1, 0, null], \"passed\": true}, {\"check\": \"turn case 3\", \"actual\": [0, -1, 0, null], \"expected\": [0, -1, 0, null], \"passed\": true}, {\"check\": \"turn case 4\", \"actual\": [1, 1, 2, 1], \"expected\": [2, 1, 2, 1], \"passed\": false}, {\"check\": \"turn case 5\", \"actual\": [1, 1, 0, null], \"expected\": [1, 1, 0, null], \"passed\": true}, {\"check\": \"turn case 6\", \"actual\": [2, 1, 4, 1], \"expected\": [2, 1, 4, 1], \"passed\": true}, {\"check\": \"turn case 7\", \"actual\": [1, -1, 2, 1], \"expected\": [0, -1, 2, 1], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":37.407,"exit_code":1,"observations":[{"actual":[1,1,2,1],"check":"turn case 0","expected":[0,1,2,1],"passed":false},{"actual":[0,1,4,0],"check":"turn case 1","expected":[1,1,4,0],"passed":false},{"actual":[1,-1,0,null],"check":"turn case 2","expected":[1,-1,0,null],"passed":true},{"actual":[0,-1,0,null],"check":"turn case 3","expected":[0,-1,0,null],"passed":true},{"actual":[1,1,2,1],"check":"turn case 4","expected":[2,1,2,1],"passed":false},{"actual":[1,1,0,null],"check":"turn case 5","expected":[1,1,0,null],"passed":true},{"actual":[1,1,4,1],"check":"turn case 6","expected":[2,1,4,1],"passed":false},{"actual":[1,-1,2,1],"check":"turn case 7","expected":[0,-1,2,1],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"turn case 0\", \"actual\": [1, 1, 2, 1], \"expected\": [0, 1, 2, 1], \"passed\": false}, {\"check\": \"turn case 1\", \"actual\": [0, 1, 4, 0], \"expected\": [1, 1, 4, 0], \"passed\": false}, {\"check\": \"turn case 2\", \"actual\": [1, -1, 0, null], \"expected\": [1, -1, 0, null], \"passed\": true}, {\"check\": \"turn case 3\", \"actual\": [0, -1, 0, null], \"expected\": [0, -1, 0, null], \"passed\": true}, {\"check\": \"turn case 4\", \"actual\": [1, 1, 2, 1], \"expected\": [2, 1, 2, 1], \"passed\": false}, {\"check\": \"turn case 5\", \"actual\": [1, 1, 0, null], \"expected\": [1, 1, 0, null], \"passed\": true}, {\"check\": \"turn case 6\", \"actual\": [1, 1, 4, 1], \"expected\": [2, 1, 4, 1], \"passed\": false}, {\"check\": \"turn case 7\", \"actual\": [1, -1, 2, 1], \"expected\": [0, -1, 2, 1], \"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."}}