FA-81926 / Poker hand evaluation / Open access
Suited wheel disqualified from low · case 01
A-2-3-4-5 all hearts and a 2-3-4-5-6 straight both fail to qualify for low.
ROOT CAUSE
The low evaluator applies deuce-to-seven thinking and rejects flushes.
VERIFIED REPAIR
In ace-to-five low, straights and flushes do not count against the hand.
Unsuccessful approach: Dropping the flush test but rejecting straights still disqualifies the wheel and six-high lows.
Case contract
Input: {"a": five cards, "b": five cards}. Ace-to-five low: aces count 1, straights and flushes are ignored, any paired rank disqualifies, the highest card must be 8 or lower to qualify. Compare qualifying lows from the highest card downward; lower wins. Return "a", "b", "tie", or "none" when neither qualifies.
Why this case matters
Hi-lo split games award half the pot from this low comparison.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(x):
R='23456789TJQKA'
def low(h):
vals=sorted({1 if c[0]=='A' else R.index(c[0])+2 for c in h}, reverse=True)
if len(vals)<5 or len({c[1] for c in h})==1: return None
if vals[0]>8: return None
return vals
la,lb=low(x['a']),low(x['b'])
if la is None and lb is None: return 'none'
if la is None: return 'b'
if lb is None: return 'a'
if la==lb: return 'tie'
return 'a' if la<lb else 'b'
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('eight low qualifies',
{'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['9h', '5d', '4d', '3c', '2c']}, 'a'),
('nine low misses', {'a': ['9h', '5d', '4c', '3s', '2h'], 'b': ['Th', '5c', '4d', '3c', 'Ac']},
'none'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a')],
[('nine low misses', {'a': ['9h', '5d', '4c', '3s', '2h'], 'b': ['Th', '5c', '4d', '3c', 'Ac']},
'none'),
('compare from top card',
{'a': ['7h', '6d', '5c', '2s', 'Ah'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'b'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('only b qualifies', {'a': ['Kh', 'Qd', 'Jc', 'Ts', '9h'], 'b': ['8d', '7h', '5d', '4s', '2d']},
'b'),
('exact tie', {'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['8d', '6c', '4s', '3h', '2c']}, 'tie'),
('trips disqualify', {'a': ['3h', '3d', '3c', '6s', '8h'], 'b': ['Kh', 'Qd', 'Jd', '9s', '8c']},
'none')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('exact tie', {'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['8d', '6c', '4s', '3h', '2c']}, 'tie'),
('trips disqualify', {'a': ['3h', '3d', '3c', '6s', '8h'], 'b': ['Kh', 'Qd', 'Jd', '9s', '8c']},
'none'),
('lowest card trap', {'a': ['Kh', '5d', '4c', '3s', '2h'], 'b': ['Qh', 'Jd', 'Tc', '9s', '7c']},
'none'),
('second card decides',
{'a': ['8h', '5d', '4c', '3s', '2h'], 'b': ['8d', '6c', '3d', '2c', 'Ac']}, 'a')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('second card decides',
{'a': ['8h', '5d', '4c', '3s', '2h'], 'b': ['8d', '6c', '3d', '2c', 'Ac']}, 'a')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('eight low qualifies',
{'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['9h', '5d', '4d', '3c', '2c']}, 'a'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a')]]
for label, args, expected in fixtures[N-1]:
try:
actual = solve(args)
except Exception as exc:
actual = 'error:' + type(exc).__name__
check(label, actual, expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| wheel is best low | a | a | Passed |
| ace low vs eight low | b | b | Passed |
| pair disqualifies | none | none | Passed |
| eight low qualifies | a | a | Passed |
| nine low misses | none | none | Passed |
| sum trap | b | b | Passed |
| straight still counts as low | b | a | Failed |
| flush low | b | a | Failed |
SHA-256 / 6790d28e6f278bc0deeeda8bba320d54a5d9136f692d4a3ea5251fdfef653831
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(x):
R='23456789TJQKA'
def low(h):
vals=sorted({1 if c[0]=='A' else R.index(c[0])+2 for c in h}, reverse=True)
if len(vals)<5 or vals[0]-vals[4]==4: return None
if vals[0]>8: return None
return vals
la,lb=low(x['a']),low(x['b'])
if la is None and lb is None: return 'none'
if la is None: return 'b'
if lb is None: return 'a'
if la==lb: return 'tie'
return 'a' if la<lb else 'b'
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('eight low qualifies',
{'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['9h', '5d', '4d', '3c', '2c']}, 'a'),
('nine low misses', {'a': ['9h', '5d', '4c', '3s', '2h'], 'b': ['Th', '5c', '4d', '3c', 'Ac']},
'none'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a')],
[('nine low misses', {'a': ['9h', '5d', '4c', '3s', '2h'], 'b': ['Th', '5c', '4d', '3c', 'Ac']},
'none'),
('compare from top card',
{'a': ['7h', '6d', '5c', '2s', 'Ah'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'b'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('only b qualifies', {'a': ['Kh', 'Qd', 'Jc', 'Ts', '9h'], 'b': ['8d', '7h', '5d', '4s', '2d']},
'b'),
('exact tie', {'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['8d', '6c', '4s', '3h', '2c']}, 'tie'),
('trips disqualify', {'a': ['3h', '3d', '3c', '6s', '8h'], 'b': ['Kh', 'Qd', 'Jd', '9s', '8c']},
'none')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('exact tie', {'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['8d', '6c', '4s', '3h', '2c']}, 'tie'),
('trips disqualify', {'a': ['3h', '3d', '3c', '6s', '8h'], 'b': ['Kh', 'Qd', 'Jd', '9s', '8c']},
'none'),
('lowest card trap', {'a': ['Kh', '5d', '4c', '3s', '2h'], 'b': ['Qh', 'Jd', 'Tc', '9s', '7c']},
'none'),
('second card decides',
{'a': ['8h', '5d', '4c', '3s', '2h'], 'b': ['8d', '6c', '3d', '2c', 'Ac']}, 'a')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('second card decides',
{'a': ['8h', '5d', '4c', '3s', '2h'], 'b': ['8d', '6c', '3d', '2c', 'Ac']}, 'a')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('eight low qualifies',
{'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['9h', '5d', '4d', '3c', '2c']}, 'a'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a')]]
for label, args, expected in fixtures[N-1]:
try:
actual = solve(args)
except Exception as exc:
actual = 'error:' + type(exc).__name__
check(label, actual, expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| wheel is best low | b | a | Failed |
| ace low vs eight low | b | b | Passed |
| pair disqualifies | none | none | Passed |
| eight low qualifies | a | a | Passed |
| nine low misses | none | none | Passed |
| sum trap | a | b | Failed |
| straight still counts as low | b | a | Failed |
| flush low | a | a | Passed |
SHA-256 / f99562d5dbbb6d56640a61583a73878399d9cfc0de6a40e3dc86fe9cc4f1dbf0
3 / The verified repair
Exit 0"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(x):
R='23456789TJQKA'
def low(h):
vals=sorted({1 if c[0]=='A' else R.index(c[0])+2 for c in h}, reverse=True)
if len(vals)<5: return None
if vals[0]>8: return None
return vals
la,lb=low(x['a']),low(x['b'])
if la is None and lb is None: return 'none'
if la is None: return 'b'
if lb is None: return 'a'
if la==lb: return 'tie'
return 'a' if la<lb else 'b'
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('eight low qualifies',
{'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['9h', '5d', '4d', '3c', '2c']}, 'a'),
('nine low misses', {'a': ['9h', '5d', '4c', '3s', '2h'], 'b': ['Th', '5c', '4d', '3c', 'Ac']},
'none'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a')],
[('nine low misses', {'a': ['9h', '5d', '4c', '3s', '2h'], 'b': ['Th', '5c', '4d', '3c', 'Ac']},
'none'),
('compare from top card',
{'a': ['7h', '6d', '5c', '2s', 'Ah'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'b'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('only b qualifies', {'a': ['Kh', 'Qd', 'Jc', 'Ts', '9h'], 'b': ['8d', '7h', '5d', '4s', '2d']},
'b'),
('exact tie', {'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['8d', '6c', '4s', '3h', '2c']}, 'tie'),
('trips disqualify', {'a': ['3h', '3d', '3c', '6s', '8h'], 'b': ['Kh', 'Qd', 'Jd', '9s', '8c']},
'none')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('exact tie', {'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['8d', '6c', '4s', '3h', '2c']}, 'tie'),
('trips disqualify', {'a': ['3h', '3d', '3c', '6s', '8h'], 'b': ['Kh', 'Qd', 'Jd', '9s', '8c']},
'none'),
('lowest card trap', {'a': ['Kh', '5d', '4c', '3s', '2h'], 'b': ['Qh', 'Jd', 'Tc', '9s', '7c']},
'none'),
('second card decides',
{'a': ['8h', '5d', '4c', '3s', '2h'], 'b': ['8d', '6c', '3d', '2c', 'Ac']}, 'a')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a'),
('second card decides',
{'a': ['8h', '5d', '4c', '3s', '2h'], 'b': ['8d', '6c', '3d', '2c', 'Ac']}, 'a')],
[('wheel is best low', {'a': ['Ah', '2d', '3c', '4s', '5h'], 'b': ['2h', '3d', '4c', '5s', '7h']},
'a'),
('ace low vs eight low',
{'a': ['Ah', '2d', '4c', '6s', '8h'], 'b': ['2h', '3d', '4d', '5s', '8c']}, 'b'),
('pair disqualifies', {'a': ['2h', '2d', '4c', '6s', '8h'], 'b': ['Kh', 'Qd', '4d', '5s', '8c']},
'none'),
('eight low qualifies',
{'a': ['8h', '6d', '4c', '3s', '2h'], 'b': ['9h', '5d', '4d', '3c', '2c']}, 'a'),
('sum trap', {'a': ['8h', '3d', '2c', '4s', 'Ah'], 'b': ['7c', '6d', '5d', '4c', '3c']}, 'b'),
('straight still counts as low',
{'a': ['Ah', '2h', '3h', '4h', '5h'], 'b': ['6c', '4d', '3d', '2c', 'Ad']}, 'a'),
('six-high straight low',
{'a': ['2h', '3d', '4c', '5s', '6h'], 'b': ['7c', '4d', '3d', '2c', 'Ad']}, 'a'),
('flush low', {'a': ['2c', '4c', '5c', '6c', '7c'], 'b': ['8d', '6h', '5d', '4s', '2d']}, 'a')]]
for label, args, expected in fixtures[N-1]:
try:
actual = solve(args)
except Exception as exc:
actual = 'error:' + type(exc).__name__
check(label, actual, expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| wheel is best low | a | a | Passed |
| ace low vs eight low | b | b | Passed |
| pair disqualifies | none | none | Passed |
| eight low qualifies | a | a | Passed |
| nine low misses | none | none | Passed |
| sum trap | b | b | Passed |
| straight still counts as low | a | a | Passed |
| flush low | a | a | Passed |
SHA-256 / ab73d6d95d1efa69283bc369142af35569f2b0124260e4feb9f7c2b216dd8624
Verification & scope
A deterministic toy model with an explicitly stated contract; card strings are rank+suit (for example "As", "Td", "10h"); no claim of conformance to any casino or tournament rulebook. 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.
Observations recorded using Python 3.12.14 at 2026-09-29T14:50:07.578461+00:00.
Case digest / ec3f5a0f8cee4dad4ef352ae9f259b4871753210ad390643f3ea9a233ee6bd68