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FA-85566 / Ride-hailing fare and surge pricing / Open access

Platform commission taken from tips · case 01

Drivers receive only 75% of every tip.

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

ROOT CAUSE

Tips are added before commission is deducted.

THE FAILURE

Tips are added before commission is deducted.

Unsuccessful approach: Moving tolls into the commission base both taxes and double-pays tolls.

Case contract

Driver pay per trip in cents: the surged core fare (core x surge tenths, half up) minus the commission percentage (floored), raised to min_pay if lower; tolls and tips pass through untouched and are outside commission and the minimum; the booking fee is platform revenue. A quest bonus is paid when this trip is exactly the Nth trip for a quest threshold N (trips_before + 1 == N). Return pay and bonus.

Why this case matters

Ride-hailing prices are computed per trip at scale; ordering, unit and boundary slips become systematic over- or under-charging.

1 / The failure

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

N = 1
observations = []
def solve(trip, plan):
    surged = (trip['core'] * trip['surge'] * 2 + 10) // 20
    share = (surged + trip['tip']) * (100 - plan['commission']) // 100
    share = max(share, plan['min_pay'])
    pay = share + trip['tolls']
    n = plan['trips_before'] + 1
    bonus = 0
    for need, amount in plan['quests']:
        if n == need:
            bonus += amount
    return {'pay': pay, 'bonus': bonus}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: commission on tips',
   [{'booking_fee': 0, 'core': 900, 'surge': 15, 'tip': 200, 'tolls': 0},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 1280}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 0, 'core': 2500, 'surge': 20, 'tip': 0, 'tolls': 300},
    {'commission': 25, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 4050}),
  ('second regression',
   [{'booking_fee': 0, 'core': 2500, 'surge': 15, 'tip': 500, 'tolls': 0},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 3312}),
  ('normal control 1',
   [{'booking_fee': 250, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2080}),
  ('normal control 2',
   [{'booking_fee': 250, 'core': 2500, 'surge': 10, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2000}),
  ('normal control 3',
   [{'booking_fee': 250, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 1440}),
  ('normal control 4',
   [{'booking_fee': 0, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 2080})],
 [('regression: commission on tips',
   [{'booking_fee': 250, 'core': 900, 'surge': 15, 'tip': 500, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 1580}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 250, 'core': 450, 'surge': 15, 'tip': 0, 'tolls': 300},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 840}),
  ('second regression',
   [{'booking_fee': 0, 'core': 450, 'surge': 10, 'tip': 0, 'tolls': 300},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 700}),
  ('normal control 1',
   [{'booking_fee': 0, 'core': 900, 'surge': 12, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 810}),
  ('normal control 2',
   [{'booking_fee': 0, 'core': 450, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 675}),
  ('normal control 3',
   [{'booking_fee': 250, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 2080}),
  ('normal control 4',
   [{'booking_fee': 250, 'core': 1733, 'surge': 12, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 1560})],
 [('regression: commission on tips',
   [{'booking_fee': 0, 'core': 1733, 'surge': 10, 'tip': 200, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 1586}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 0, 'core': 2500, 'surge': 10, 'tip': 0, 'tolls': 300},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 2175}),
  ('second regression',
   [{'booking_fee': 0, 'core': 2500, 'surge': 15, 'tip': 0, 'tolls': 300},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 10}],
   {'bonus': 0, 'pay': 3112}),
  ('normal control 1',
   [{'booking_fee': 0, 'core': 1733, 'surge': 12, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 1560}),
  ('normal control 2',
   [{'booking_fee': 250, 'core': 2500, 'surge': 10, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2000}),
  ('normal control 3',
   [{'booking_fee': 0, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 20}],
   {'bonus': 0, 'pay': 1950}),
  ('normal control 4',
   [{'booking_fee': 0, 'core': 900, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 1012})],
 [('regression: commission on tips',
   [{'booking_fee': 0, 'core': 2500, 'surge': 10, 'tip': 500, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 2375}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 250, 'core': 450, 'surge': 12, 'tip': 0, 'tolls': 300},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 20}],
   {'bonus': 0, 'pay': 800}),
  ('second regression',
   [{'booking_fee': 0, 'core': 1733, 'surge': 15, 'tip': 500, 'tolls': 300},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2750}),
  ('normal control 1',
   [{'booking_fee': 250, 'core': 450, 'surge': 12, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 432}),
  ('normal control 2',
   [{'booking_fee': 0, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 10}],
   {'bonus': 0, 'pay': 1440}),
  ('normal control 3',
   [{'booking_fee': 0, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 1440}),
  ('normal control 4',
   [{'booking_fee': 0, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 20}],
   {'bonus': 0, 'pay': 1440})],
 [('regression: commission on tips',
   [{'booking_fee': 250, 'core': 2500, 'surge': 10, 'tip': 200, 'tolls': 300},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2500}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 250, 'core': 1733, 'surge': 20, 'tip': 500, 'tolls': 300},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 10}],
   {'bonus': 0, 'pay': 3399}),
  ('second regression',
   [{'booking_fee': 250, 'core': 450, 'surge': 10, 'tip': 200, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 10}],
   {'bonus': 0, 'pay': 700}),
  ('normal control 1',
   [{'booking_fee': 250, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 2080}),
  ('normal control 2',
   [{'booking_fee': 0, 'core': 1733, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 2599}),
  ('normal control 3',
   [{'booking_fee': 250, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 1440}),
  ('normal control 4',
   [{'booking_fee': 0, 'core': 1733, 'surge': 10, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 1386})]]
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: commission on tips{'bonus': 0, 'pay': 1240}{'bonus': 0, 'pay': 1280}Failed
partial repair probe: commission on tips{'bonus': 0, 'pay': 4050}{'bonus': 0, 'pay': 4050}Passed
second regression{'bonus': 2500, 'pay': 3187}{'bonus': 2500, 'pay': 3312}Failed
normal control 1{'bonus': 1000, 'pay': 2080}{'bonus': 1000, 'pay': 2080}Passed
normal control 2{'bonus': 1000, 'pay': 2000}{'bonus': 1000, 'pay': 2000}Passed
normal control 3{'bonus': 0, 'pay': 1440}{'bonus': 0, 'pay': 1440}Passed
normal control 4{'bonus': 2500, 'pay': 2080}{'bonus': 2500, 'pay': 2080}Passed

SHA-256 / 9a7043a0c3f4463077136a987ac3ed8bcd660321dcb7571ea59d90c6468245fc

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(trip, plan):
    surged = (trip['core'] * trip['surge'] * 2 + 10) // 20
    share = (surged + trip['tolls']) * (100 - plan['commission']) // 100
    share = max(share, plan['min_pay'])
    pay = share + trip['tolls'] + trip['tip']
    n = plan['trips_before'] + 1
    bonus = 0
    for need, amount in plan['quests']:
        if n == need:
            bonus += amount
    return {'pay': pay, 'bonus': bonus}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: commission on tips',
   [{'booking_fee': 0, 'core': 900, 'surge': 15, 'tip': 200, 'tolls': 0},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 1280}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 0, 'core': 2500, 'surge': 20, 'tip': 0, 'tolls': 300},
    {'commission': 25, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 4050}),
  ('second regression',
   [{'booking_fee': 0, 'core': 2500, 'surge': 15, 'tip': 500, 'tolls': 0},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 3312}),
  ('normal control 1',
   [{'booking_fee': 250, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2080}),
  ('normal control 2',
   [{'booking_fee': 250, 'core': 2500, 'surge': 10, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2000}),
  ('normal control 3',
   [{'booking_fee': 250, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 1440}),
  ('normal control 4',
   [{'booking_fee': 0, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 2080})],
 [('regression: commission on tips',
   [{'booking_fee': 250, 'core': 900, 'surge': 15, 'tip': 500, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 1580}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 250, 'core': 450, 'surge': 15, 'tip': 0, 'tolls': 300},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 840}),
  ('second regression',
   [{'booking_fee': 0, 'core': 450, 'surge': 10, 'tip': 0, 'tolls': 300},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 700}),
  ('normal control 1',
   [{'booking_fee': 0, 'core': 900, 'surge': 12, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 810}),
  ('normal control 2',
   [{'booking_fee': 0, 'core': 450, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 675}),
  ('normal control 3',
   [{'booking_fee': 250, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 2080}),
  ('normal control 4',
   [{'booking_fee': 250, 'core': 1733, 'surge': 12, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 1560})],
 [('regression: commission on tips',
   [{'booking_fee': 0, 'core': 1733, 'surge': 10, 'tip': 200, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 1586}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 0, 'core': 2500, 'surge': 10, 'tip': 0, 'tolls': 300},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 2175}),
  ('second regression',
   [{'booking_fee': 0, 'core': 2500, 'surge': 15, 'tip': 0, 'tolls': 300},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 10}],
   {'bonus': 0, 'pay': 3112}),
  ('normal control 1',
   [{'booking_fee': 0, 'core': 1733, 'surge': 12, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 1560}),
  ('normal control 2',
   [{'booking_fee': 250, 'core': 2500, 'surge': 10, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2000}),
  ('normal control 3',
   [{'booking_fee': 0, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 20}],
   {'bonus': 0, 'pay': 1950}),
  ('normal control 4',
   [{'booking_fee': 0, 'core': 900, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 1012})],
 [('regression: commission on tips',
   [{'booking_fee': 0, 'core': 2500, 'surge': 10, 'tip': 500, 'tolls': 0},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 2375}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 250, 'core': 450, 'surge': 12, 'tip': 0, 'tolls': 300},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 20}],
   {'bonus': 0, 'pay': 800}),
  ('second regression',
   [{'booking_fee': 0, 'core': 1733, 'surge': 15, 'tip': 500, 'tolls': 300},
    {'commission': 25, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2750}),
  ('normal control 1',
   [{'booking_fee': 250, 'core': 450, 'surge': 12, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 432}),
  ('normal control 2',
   [{'booking_fee': 0, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 10}],
   {'bonus': 0, 'pay': 1440}),
  ('normal control 3',
   [{'booking_fee': 0, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 1440}),
  ('normal control 4',
   [{'booking_fee': 0, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 20}],
   {'bonus': 0, 'pay': 1440})],
 [('regression: commission on tips',
   [{'booking_fee': 250, 'core': 2500, 'surge': 10, 'tip': 200, 'tolls': 300},
    {'commission': 20, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 2500}),
  ('partial repair probe: commission on tips',
   [{'booking_fee': 250, 'core': 1733, 'surge': 20, 'tip': 500, 'tolls': 300},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 10}],
   {'bonus': 0, 'pay': 3399}),
  ('second regression',
   [{'booking_fee': 250, 'core': 450, 'surge': 10, 'tip': 200, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 10}],
   {'bonus': 0, 'pay': 700}),
  ('normal control 1',
   [{'booking_fee': 250, 'core': 1733, 'surge': 15, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 3}],
   {'bonus': 0, 'pay': 2080}),
  ('normal control 2',
   [{'booking_fee': 0, 'core': 1733, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 25, 'min_pay': 700, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 19}],
   {'bonus': 2500, 'pay': 2599}),
  ('normal control 3',
   [{'booking_fee': 250, 'core': 900, 'surge': 20, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 400, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 9}],
   {'bonus': 1500, 'pay': 1440}),
  ('normal control 4',
   [{'booking_fee': 0, 'core': 1733, 'surge': 10, 'tip': 0, 'tolls': 0},
    {'commission': 20, 'min_pay': 500, 'quests': [[10, 1500], [20, 2500], [25, 1000]], 'trips_before': 24}],
   {'bonus': 1000, 'pay': 1386})]]
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: commission on tips{'bonus': 0, 'pay': 1280}{'bonus': 0, 'pay': 1280}Passed
partial repair probe: commission on tips{'bonus': 0, 'pay': 4275}{'bonus': 0, 'pay': 4050}Failed
second regression{'bonus': 2500, 'pay': 3312}{'bonus': 2500, 'pay': 3312}Passed
normal control 1{'bonus': 1000, 'pay': 2080}{'bonus': 1000, 'pay': 2080}Passed
normal control 2{'bonus': 1000, 'pay': 2000}{'bonus': 1000, 'pay': 2000}Passed
normal control 3{'bonus': 0, 'pay': 1440}{'bonus': 0, 'pay': 1440}Passed
normal control 4{'bonus': 2500, 'pay': 2080}{'bonus': 2500, 'pay': 2080}Passed

SHA-256 / 63bed224262ce53975b0defc76c981f286795cd343f7a47484ddb9734a1ebe3b

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 7 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

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Verification & scope

A deterministic toy pricing contract stipulated for this example; it does not reproduce the pricing of any real ride-hailing operator or regulator. 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 2026-09-29T14:50:41.589992+00:00.

Case digest / 458ba27940ed73bbc0df86cb833f8fd93c5c2f0b73431f7f604420a63e9c56ac