{"abstract":"A knight that moved from g1 can move from g1 again.","category":"Chess move legality","checks":8,"contract":"Input: {\"board\", \"turn\": \"w\" or \"b\", \"moves\": [[from, to], ...]}. Replay the moves; return the index of the first move that starts from an empty square, moves a piece of the side not to move, or lands on a piece of its own colour; return -1 if all pass. Each move replaces any piece on the destination and passes the turn.","contract_signature":"x","evaluation_group":"w2-chess_move_legality-move-list-turn-order","failed_approach":"setdefault keeps a captured piece on the destination instead of replacing it.","family":"w2-chess_move_legality-move-list-turn-order-destination-replacement","id":"FA-82821","implementations":{"attempt":{"sha256":"7bcfcfe3d033d851ac8882850a913fc6166f931370ef76cdc489f7a8ce173005","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    b=dict(x['board']); white=x['turn']=='w'\n    for i,(fr,to) in enumerate(x['moves']):\n        p=b.get(fr)\n        if p is None or p.isupper()!=white: return i\n        q=b.get(to)\n        if q is not None and q.isupper()==white: return i\n        del b[fr]\n        b.setdefault(to,p)\n        white=not white\n    return -1\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('clean sequence',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['e7', 'e5']],\n    'turn': 'w'},\n   -1),\n  ('white moves twice',\n   {'board': {'d2': 'P', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['d2', 'd4']],\n    'turn': 'w'},\n   1),\n  ('black to start',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e7', 'e5'], ['e2', 'e4']],\n    'turn': 'b'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)],\n [('clean sequence',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['e7', 'e5']],\n    'turn': 'w'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('empty origin', {'board': {'e1': 'K', 'e8': 'k'}, 'moves': [['e2', 'e4']], 'turn': 'w'}, 0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('black captures own',\n   {'board': {'d8': 'q', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e3'], ['d8', 'e7']],\n    'turn': 'w'},\n   1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)],\n [('clean sequence',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['e7', 'e5']],\n    'turn': 'w'},\n   -1),\n  ('white moves twice',\n   {'board': {'d2': 'P', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['d2', 'd4']],\n    'turn': 'w'},\n   1),\n  ('black to start',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e7', 'e5'], ['e2', 'e4']],\n    'turn': 'b'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)],\n [('clean sequence',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['e7', 'e5']],\n    'turn': 'w'},\n   -1),\n  ('white moves twice',\n   {'board': {'d2': 'P', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['d2', 'd4']],\n    'turn': 'w'},\n   1),\n  ('black to start',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e7', 'e5'], ['e2', 'e4']],\n    'turn': 'b'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)],\n [('black to start',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e7', 'e5'], ['e2', 'e4']],\n    'turn': 'b'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('empty origin', {'board': {'e1': 'K', 'e8': 'k'}, 'moves': [['e2', 'e4']], 'turn': 'w'}, 0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('black captures own',\n   {'board': {'d8': 'q', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e3'], ['d8', 'e7']],\n    'turn': 'w'},\n   1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)]]\nfor label, args, expected in fixtures[N-1]:\n    try:\n        actual = solve(args)\n    except Exception as exc:\n        actual = 'error:' + type(exc).__name__\n    check(label, actual, 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":"f162673b039bd9706cb5e05639a73447c08ed2a79aec466941c7e3ebefb50748","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    b=dict(x['board']); white=x['turn']=='w'\n    for i,(fr,to) in enumerate(x['moves']):\n        p=b.get(fr)\n        if p is None or p.isupper()!=white: return i\n        q=b.get(to)\n        if q is not None and q.isupper()==white: return i\n        b[to]=p\n        white=not white\n    return -1\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('clean sequence',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['e7', 'e5']],\n    'turn': 'w'},\n   -1),\n  ('white moves twice',\n   {'board': {'d2': 'P', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['d2', 'd4']],\n    'turn': 'w'},\n   1),\n  ('black to start',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e7', 'e5'], ['e2', 'e4']],\n    'turn': 'b'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)],\n [('clean sequence',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['e7', 'e5']],\n    'turn': 'w'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('empty origin', {'board': {'e1': 'K', 'e8': 'k'}, 'moves': [['e2', 'e4']], 'turn': 'w'}, 0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('black captures own',\n   {'board': {'d8': 'q', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e3'], ['d8', 'e7']],\n    'turn': 'w'},\n   1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)],\n [('clean sequence',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['e7', 'e5']],\n    'turn': 'w'},\n   -1),\n  ('white moves twice',\n   {'board': {'d2': 'P', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['d2', 'd4']],\n    'turn': 'w'},\n   1),\n  ('black to start',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e7', 'e5'], ['e2', 'e4']],\n    'turn': 'b'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)],\n [('clean sequence',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['e7', 'e5']],\n    'turn': 'w'},\n   -1),\n  ('white moves twice',\n   {'board': {'d2': 'P', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e4'], ['d2', 'd4']],\n    'turn': 'w'},\n   1),\n  ('black to start',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e7', 'e5'], ['e2', 'e4']],\n    'turn': 'b'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)],\n [('black to start',\n   {'board': {'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e7', 'e5'], ['e2', 'e4']],\n    'turn': 'b'},\n   -1),\n  ('captured piece moves',\n   {'board': {'d1': 'Q', 'd8': 'q', 'e1': 'K', 'e8': 'k'},\n    'moves': [['d1', 'd8'], ['d8', 'd1']],\n    'turn': 'w'},\n   1),\n  ('capture own piece',\n   {'board': {'d1': 'Q', 'd2': 'P', 'e1': 'K', 'e8': 'k'}, 'moves': [['d1', 'd2']], 'turn': 'w'},\n   0),\n  ('empty origin', {'board': {'e1': 'K', 'e8': 'k'}, 'moves': [['e2', 'e4']], 'turn': 'w'}, 0),\n  ('vacated square reused',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['g1', 'h3']],\n    'turn': 'w'},\n   2),\n  ('capture then recapture',\n   {'board': {'d5': 'p', 'd8': 'q', 'e1': 'K', 'e4': 'P', 'e8': 'k'},\n    'moves': [['e4', 'd5'], ['d8', 'd5']],\n    'turn': 'w'},\n   -1),\n  ('black captures own',\n   {'board': {'d8': 'q', 'e1': 'K', 'e2': 'P', 'e7': 'p', 'e8': 'k'},\n    'moves': [['e2', 'e3'], ['d8', 'e7']],\n    'turn': 'w'},\n   1),\n  ('four clean moves',\n   {'board': {'e1': 'K', 'e8': 'k', 'g1': 'N', 'g8': 'n'},\n    'moves': [['g1', 'f3'], ['g8', 'f6'], ['f3', 'g1'], ['f6', 'g8']],\n    'turn': 'w'},\n   -1)]]\nfor label, args, expected in fixtures[N-1]:\n    try:\n        actual = solve(args)\n    except Exception as exc:\n        actual = 'error:' + type(exc).__name__\n    check(label, actual, 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 deterministic toy model with an explicitly stated contract; boards are {square: piece} with white upper-case and black lower-case pieces; no claim of full FIDE Laws conformance. 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-chess_move_legality-move-list-turn-order-destination-replacement","generated_at":"2026-09-29T14:50:15.772974+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Game servers must reject out-of-turn and self-capturing moves in submitted move lists.","root_cause":"The origin square is not cleared when the piece moves.","sha256":"c010170ccb3a72635fc02b6070aad59994ad3f57db14fddeb99cf0b12499c7aa","title":"Moved piece left behind on its origin · 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":40.862,"exit_code":1,"observations":[{"actual":-1,"check":"clean sequence","expected":-1,"passed":true},{"actual":1,"check":"white moves twice","expected":1,"passed":true},{"actual":-1,"check":"black to start","expected":-1,"passed":true},{"actual":-1,"check":"captured piece moves","expected":1,"passed":false},{"actual":0,"check":"capture own piece","expected":0,"passed":true},{"actual":2,"check":"vacated square reused","expected":2,"passed":true},{"actual":1,"check":"capture then recapture","expected":-1,"passed":false},{"actual":-1,"check":"four clean moves","expected":-1,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"clean sequence\", \"actual\": -1, \"expected\": -1, \"passed\": true}, {\"check\": \"white moves twice\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"black to start\", \"actual\": -1, \"expected\": -1, \"passed\": true}, {\"check\": \"captured piece moves\", \"actual\": -1, \"expected\": 1, \"passed\": false}, {\"check\": \"capture own piece\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"vacated square reused\", \"actual\": 2, \"expected\": 2, \"passed\": true}, {\"check\": \"capture then recapture\", \"actual\": 1, \"expected\": -1, \"passed\": false}, {\"check\": \"four clean moves\", \"actual\": -1, \"expected\": -1, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":39.89,"exit_code":1,"observations":[{"actual":-1,"check":"clean sequence","expected":-1,"passed":true},{"actual":1,"check":"white moves twice","expected":1,"passed":true},{"actual":-1,"check":"black to start","expected":-1,"passed":true},{"actual":1,"check":"captured piece moves","expected":1,"passed":true},{"actual":0,"check":"capture own piece","expected":0,"passed":true},{"actual":-1,"check":"vacated square reused","expected":2,"passed":false},{"actual":-1,"check":"capture then recapture","expected":-1,"passed":true},{"actual":2,"check":"four clean moves","expected":-1,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"clean sequence\", \"actual\": -1, \"expected\": -1, \"passed\": true}, {\"check\": \"white moves twice\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"black to start\", \"actual\": -1, \"expected\": -1, \"passed\": true}, {\"check\": \"captured piece moves\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"capture own piece\", \"actual\": 0, \"expected\": 0, \"passed\": true}, {\"check\": \"vacated square reused\", \"actual\": -1, \"expected\": 2, \"passed\": false}, {\"check\": \"capture then recapture\", \"actual\": -1, \"expected\": -1, \"passed\": true}, {\"check\": \"four clean moves\", \"actual\": 2, \"expected\": -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."}}