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FA-85181 / Fantasy sports scoring / Open access

Unbeaten zero treated as a duck · case 01

A batter not out on 0 at the end of the innings is docked 2 points.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The duck test does not require a dismissal.

VERIFIED REPAIR

Apply the duck only to dismissed batters.

Unsuccessful approach: Treating any faced ball as a dismissal still penalizes not-out batters.

Case contract

Score a T20 batting innings: 1 per run, +1 per four, +2 per six; only the highest milestone bonus applies (30+ -> 4, 50+ -> 8, 100+ -> 16). A duck (-2) applies when the batter is out for 0 after facing at least one ball, except for BOWL-role players. Strike-rate bonus for non-BOWL players with at least 10 balls, using exact runs*100 vs balls: >170 +6, >150 +4, >=130 +2, >=70 0, >=60 -2, >=50 -4, below -6.

Why this case matters

Cricket fantasy contests hinge on exclusive milestones, duck eligibility and strike-rate bands evaluated exactly.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(inn):
    pts = inn['runs'] + inn['fours'] + inn['sixes'] * 2
    if inn['runs'] >= 100:
        pts += 16
    elif inn['runs'] >= 50:
        pts += 8
    elif inn['runs'] >= 30:
        pts += 4
    if inn['runs'] == 0 and inn['balls'] >= 1 and inn['role'] != 'BOWL':
        pts -= 2
    if inn['balls'] >= 10 and inn['role'] != 'BOWL':
        r, b = inn['runs'] * 100, inn['balls']
        if r > 170 * b:
            pts += 6
        elif r > 150 * b:
            pts += 4
        elif r >= 130 * b:
            pts += 2
        elif r >= 70 * b:
            pass
        elif r >= 60 * b:
            pts -= 2
        elif r >= 50 * b:
            pts -= 4
        else:
            pts -= 6
    return pts
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: not-out duck',
   [{'balls': 47, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 26, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 34, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 18, 'fours': 0, 'out': True, 'role': 'WK', 'runs': 31, 'sixes': 5}], 51),
  ('normal control 2', [{'balls': 9, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 51, 'sixes': 4}], 73),
  ('normal control 3', [{'balls': 0, 'fours': 0, 'out': True, 'role': 'BOWL', 'runs': 0, 'sixes': 0}], 0),
  ('normal control 4', [{'balls': 0, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 0, 'sixes': 0}], 0)],
 [('regression: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 23, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 10, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 1, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 34, 'sixes': 0}], 44),
  ('normal control 2', [{'balls': 9, 'fours': 8, 'out': False, 'role': 'WK', 'runs': 34, 'sixes': 0}], 46),
  ('normal control 3', [{'balls': 67, 'fours': 7, 'out': False, 'role': 'BOWL', 'runs': 30, 'sixes': 0}], 41),
  ('normal control 4', [{'balls': 47, 'fours': 12, 'out': True, 'role': 'AR', 'runs': 51, 'sixes': 0}], 71)],
 [('regression: not-out duck', [{'balls': 10, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}],
   -6),
  ('partial repair probe: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 23, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 26, 'fours': 2, 'out': False, 'role': 'BAT', 'runs': 40, 'sixes': 0}], 50),
  ('normal control 2', [{'balls': 39, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 59, 'sixes': 3}], 83),
  ('normal control 3', [{'balls': 10, 'fours': 1, 'out': False, 'role': 'BAT', 'runs': 34, 'sixes': 5}], 55),
  ('normal control 4', [{'balls': 47, 'fours': 7, 'out': True, 'role': 'BOWL', 'runs': 80, 'sixes': 1}], 97)],
 [('regression: not-out duck',
   [{'balls': 23, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 11, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 9, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], 0),
  ('normal control 1', [{'balls': 11, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 50, 'sixes': 5}], 74),
  ('normal control 2', [{'balls': 1, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -2),
  ('normal control 3', [{'balls': 47, 'fours': 8, 'out': False, 'role': 'BAT', 'runs': 51, 'sixes': 2}], 71),
  ('normal control 4', [{'balls': 11, 'fours': 4, 'out': False, 'role': 'AR', 'runs': 17, 'sixes': 0}], 25)],
 [('regression: not-out duck', [{'balls': 16, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}],
   -6),
  ('partial repair probe: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 14, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 10, 'fours': 14, 'out': True, 'role': 'WK', 'runs': 92, 'sixes': 0}], 120),
  ('normal control 2', [{'balls': 1, 'fours': 4, 'out': False, 'role': 'BAT', 'runs': 29, 'sixes': 1}], 35),
  ('normal control 3', [{'balls': 55, 'fours': 7, 'out': True, 'role': 'AR', 'runs': 34, 'sixes': 0}], 43),
  ('normal control 4', [{'balls': 27, 'fours': 7, 'out': False, 'role': 'WK', 'runs': 36, 'sixes': 1}], 51)]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), 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 fixtureActualExpectedOutcome
regression: not-out duck-8-6Failed
partial repair probe: not-out duck-8-6Failed
second regression-8-6Failed
normal control 15151Passed
normal control 27373Passed
normal control 300Passed
normal control 400Passed

SHA-256 / 9d6ce9e7de4849d1899496d5eea40b54df9529962520cec673d26204e77fd81e

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(inn):
    pts = inn['runs'] + inn['fours'] + inn['sixes'] * 2
    if inn['runs'] >= 100:
        pts += 16
    elif inn['runs'] >= 50:
        pts += 8
    elif inn['runs'] >= 30:
        pts += 4
    if (inn['out'] or inn['balls'] > 0) and inn['runs'] == 0 and inn['balls'] >= 1 and inn['role'] != 'BOWL':
        pts -= 2
    if inn['balls'] >= 10 and inn['role'] != 'BOWL':
        r, b = inn['runs'] * 100, inn['balls']
        if r > 170 * b:
            pts += 6
        elif r > 150 * b:
            pts += 4
        elif r >= 130 * b:
            pts += 2
        elif r >= 70 * b:
            pass
        elif r >= 60 * b:
            pts -= 2
        elif r >= 50 * b:
            pts -= 4
        else:
            pts -= 6
    return pts
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: not-out duck',
   [{'balls': 47, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 26, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 34, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 18, 'fours': 0, 'out': True, 'role': 'WK', 'runs': 31, 'sixes': 5}], 51),
  ('normal control 2', [{'balls': 9, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 51, 'sixes': 4}], 73),
  ('normal control 3', [{'balls': 0, 'fours': 0, 'out': True, 'role': 'BOWL', 'runs': 0, 'sixes': 0}], 0),
  ('normal control 4', [{'balls': 0, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 0, 'sixes': 0}], 0)],
 [('regression: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 23, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 10, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 1, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 34, 'sixes': 0}], 44),
  ('normal control 2', [{'balls': 9, 'fours': 8, 'out': False, 'role': 'WK', 'runs': 34, 'sixes': 0}], 46),
  ('normal control 3', [{'balls': 67, 'fours': 7, 'out': False, 'role': 'BOWL', 'runs': 30, 'sixes': 0}], 41),
  ('normal control 4', [{'balls': 47, 'fours': 12, 'out': True, 'role': 'AR', 'runs': 51, 'sixes': 0}], 71)],
 [('regression: not-out duck', [{'balls': 10, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}],
   -6),
  ('partial repair probe: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 23, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 26, 'fours': 2, 'out': False, 'role': 'BAT', 'runs': 40, 'sixes': 0}], 50),
  ('normal control 2', [{'balls': 39, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 59, 'sixes': 3}], 83),
  ('normal control 3', [{'balls': 10, 'fours': 1, 'out': False, 'role': 'BAT', 'runs': 34, 'sixes': 5}], 55),
  ('normal control 4', [{'balls': 47, 'fours': 7, 'out': True, 'role': 'BOWL', 'runs': 80, 'sixes': 1}], 97)],
 [('regression: not-out duck',
   [{'balls': 23, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 11, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 9, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], 0),
  ('normal control 1', [{'balls': 11, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 50, 'sixes': 5}], 74),
  ('normal control 2', [{'balls': 1, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -2),
  ('normal control 3', [{'balls': 47, 'fours': 8, 'out': False, 'role': 'BAT', 'runs': 51, 'sixes': 2}], 71),
  ('normal control 4', [{'balls': 11, 'fours': 4, 'out': False, 'role': 'AR', 'runs': 17, 'sixes': 0}], 25)],
 [('regression: not-out duck', [{'balls': 16, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}],
   -6),
  ('partial repair probe: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 14, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 10, 'fours': 14, 'out': True, 'role': 'WK', 'runs': 92, 'sixes': 0}], 120),
  ('normal control 2', [{'balls': 1, 'fours': 4, 'out': False, 'role': 'BAT', 'runs': 29, 'sixes': 1}], 35),
  ('normal control 3', [{'balls': 55, 'fours': 7, 'out': True, 'role': 'AR', 'runs': 34, 'sixes': 0}], 43),
  ('normal control 4', [{'balls': 27, 'fours': 7, 'out': False, 'role': 'WK', 'runs': 36, 'sixes': 1}], 51)]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), 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 fixtureActualExpectedOutcome
regression: not-out duck-8-6Failed
partial repair probe: not-out duck-8-6Failed
second regression-8-6Failed
normal control 15151Passed
normal control 27373Passed
normal control 300Passed
normal control 400Passed

SHA-256 / 53003435fa65d850f7384f0b1ce01eaaf9fbd4474008e4ea6955767e6d158751

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(inn):
    pts = inn['runs'] + inn['fours'] + inn['sixes'] * 2
    if inn['runs'] >= 100:
        pts += 16
    elif inn['runs'] >= 50:
        pts += 8
    elif inn['runs'] >= 30:
        pts += 4
    if inn['out'] and inn['runs'] == 0 and inn['balls'] >= 1 and inn['role'] != 'BOWL':
        pts -= 2
    if inn['balls'] >= 10 and inn['role'] != 'BOWL':
        r, b = inn['runs'] * 100, inn['balls']
        if r > 170 * b:
            pts += 6
        elif r > 150 * b:
            pts += 4
        elif r >= 130 * b:
            pts += 2
        elif r >= 70 * b:
            pass
        elif r >= 60 * b:
            pts -= 2
        elif r >= 50 * b:
            pts -= 4
        else:
            pts -= 6
    return pts
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: not-out duck',
   [{'balls': 47, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 26, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 34, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 18, 'fours': 0, 'out': True, 'role': 'WK', 'runs': 31, 'sixes': 5}], 51),
  ('normal control 2', [{'balls': 9, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 51, 'sixes': 4}], 73),
  ('normal control 3', [{'balls': 0, 'fours': 0, 'out': True, 'role': 'BOWL', 'runs': 0, 'sixes': 0}], 0),
  ('normal control 4', [{'balls': 0, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 0, 'sixes': 0}], 0)],
 [('regression: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 23, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 10, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 1, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 34, 'sixes': 0}], 44),
  ('normal control 2', [{'balls': 9, 'fours': 8, 'out': False, 'role': 'WK', 'runs': 34, 'sixes': 0}], 46),
  ('normal control 3', [{'balls': 67, 'fours': 7, 'out': False, 'role': 'BOWL', 'runs': 30, 'sixes': 0}], 41),
  ('normal control 4', [{'balls': 47, 'fours': 12, 'out': True, 'role': 'AR', 'runs': 51, 'sixes': 0}], 71)],
 [('regression: not-out duck', [{'balls': 10, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}],
   -6),
  ('partial repair probe: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 23, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 26, 'fours': 2, 'out': False, 'role': 'BAT', 'runs': 40, 'sixes': 0}], 50),
  ('normal control 2', [{'balls': 39, 'fours': 6, 'out': True, 'role': 'AR', 'runs': 59, 'sixes': 3}], 83),
  ('normal control 3', [{'balls': 10, 'fours': 1, 'out': False, 'role': 'BAT', 'runs': 34, 'sixes': 5}], 55),
  ('normal control 4', [{'balls': 47, 'fours': 7, 'out': True, 'role': 'BOWL', 'runs': 80, 'sixes': 1}], 97)],
 [('regression: not-out duck',
   [{'balls': 23, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('partial repair probe: not-out duck',
   [{'balls': 11, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 9, 'fours': 0, 'out': False, 'role': 'AR', 'runs': 0, 'sixes': 0}], 0),
  ('normal control 1', [{'balls': 11, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 50, 'sixes': 5}], 74),
  ('normal control 2', [{'balls': 1, 'fours': 0, 'out': True, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -2),
  ('normal control 3', [{'balls': 47, 'fours': 8, 'out': False, 'role': 'BAT', 'runs': 51, 'sixes': 2}], 71),
  ('normal control 4', [{'balls': 11, 'fours': 4, 'out': False, 'role': 'AR', 'runs': 17, 'sixes': 0}], 25)],
 [('regression: not-out duck', [{'balls': 16, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}],
   -6),
  ('partial repair probe: not-out duck',
   [{'balls': 10, 'fours': 0, 'out': False, 'role': 'BAT', 'runs': 0, 'sixes': 0}], -6),
  ('second regression', [{'balls': 14, 'fours': 0, 'out': False, 'role': 'WK', 'runs': 0, 'sixes': 0}], -6),
  ('normal control 1', [{'balls': 10, 'fours': 14, 'out': True, 'role': 'WK', 'runs': 92, 'sixes': 0}], 120),
  ('normal control 2', [{'balls': 1, 'fours': 4, 'out': False, 'role': 'BAT', 'runs': 29, 'sixes': 1}], 35),
  ('normal control 3', [{'balls': 55, 'fours': 7, 'out': True, 'role': 'AR', 'runs': 34, 'sixes': 0}], 43),
  ('normal control 4', [{'balls': 27, 'fours': 7, 'out': False, 'role': 'WK', 'runs': 36, 'sixes': 1}], 51)]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), 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 fixtureActualExpectedOutcome
regression: not-out duck-6-6Passed
partial repair probe: not-out duck-6-6Passed
second regression-6-6Passed
normal control 15151Passed
normal control 27373Passed
normal control 300Passed
normal control 400Passed

SHA-256 / 7631798c016927c15c1cdfd14e0ed8262ae7c986e11c9b1690920eb89583e549

Verification & scope

A deterministic toy scoring contract stipulated for this example; it is not the rulebook of any real fantasy platform. 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 2026-09-29T14:50:37.970518+00:00.

Case digest / d83cdd5b82df61763dbb17d6aa7c3ff0d4b146409161f40cb2c596e9dc8fdb77