FA-67641 / Elevator dispatch scheduling / Open access

Door obstruction reopen and nudging: reopen limit · case 01

The doors reopen a third time instead of nudging, or safety-edge contacts bring nudging forward.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Nudging starts only on the fourth obstruction.

VERIFIED REPAIR

Start nudging on the third curtain obstruction.

Unsuccessful approach: Counting safety-edge contacts towards the limit nudges after edge reopenings.

Case contract

During a door cycle each light-curtain obstruction reopens the doors and counts; the third obstruction, or an obstruction while the curtain has been blocked continuously for 20 s or more since the first unbroken obstruction, starts nudging (slow close, curtain ignored). While nudging, curtain obstructions are ignored. The mechanical safety edge always reopens and does not affect counting. unblock ends a continuous blockage. closed ends the cycle and resets everything.

Why this case matters

Lift group controllers make these decisions many times per minute; a wrong answer strands passengers, wastes trips or overrides a safety rule.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(x):
    count = 0
    nudge = False
    block_start = None
    out = []
    for t, ev in x['events']:
        if ev == 'obstruct':
            if block_start is None:
                block_start = t
            if nudge:
                out.append('ignored')
            else:
                count += 1
                if count > 3 or t - block_start >= 20:
                    nudge = True
                    out.append('nudge')
                else:
                    out.append('reopen')
        elif ev == 'unblock':
            block_start = None
        elif ev == 'edge':
            out.append('reopen')
        elif ev == 'closed':
            count = 0
            nudge = False
            block_start = None
            out.append('done')
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('regression: closing clears nudging', {'events': [[0, 'obstruct'], [1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'done', 'reopen']), ('sampled regression 1', {'events': [[8, 'obstruct'], [13, 'closed'], [18, 'obstruct'], [26, 'edge'], [28, 'obstruct'], [29, 'obstruct'], [41, 'obstruct'], [42, 'obstruct'], [54, 'obstruct'], [66, 'closed']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']), ('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('control 4', {'events': [[5, 'edge'], [10, 'unblock'], [11, 'obstruct'], [19, 'closed']]}, ['reopen', 'reopen', 'done']), ('control 7', {'events': [[2, 'unblock'], [10, 'edge'], [18, 'obstruct'], [23, 'unblock'], [28, 'edge'], [33, 'obstruct']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 10', {'events': [[8, 'edge'], [13, 'obstruct'], [18, 'edge'], [30, 'unblock'], [35, 'obstruct'], [40, 'obstruct'], [42, 'unblock']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'nudge'])], [('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 17', {'events': [[5, 'unblock'], [13, 'unblock'], [14, 'closed'], [26, 'obstruct'], [34, 'edge'], [36, 'obstruct'], [48, 'unblock'], [60, 'obstruct'], [72, 'unblock']]}, ['done', 'reopen', 'reopen', 'reopen', 'nudge']), ('sampled regression 13', {'events': [[5, 'unblock'], [13, 'obstruct'], [21, 'closed'], [29, 'edge'], [34, 'obstruct'], [46, 'obstruct'], [47, 'unblock'], [55, 'obstruct'], [63, 'closed'], [64, 'unblock']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'done']), ('boundary: new cycle after closing', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct'], [5, 'unblock']]}, ['reopen', 'reopen', 'done', 'reopen']), ('control 12', {'events': [[5, 'obstruct'], [13, 'edge'], [15, 'unblock'], [16, 'obstruct'], [21, 'unblock'], [22, 'edge'], [30, 'closed'], [32, 'obstruct'], [44, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'done', 'reopen', 'reopen']), ('sampled regression 15', {'events': [[8, 'obstruct'], [9, 'obstruct'], [10, 'obstruct'], [11, 'unblock'], [16, 'obstruct'], [24, 'obstruct'], [29, 'edge']]}, ['reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'reopen']), ('sampled regression 18', {'events': [[12, 'obstruct'], [20, 'obstruct'], [22, 'obstruct']]}, ['reopen', 'reopen', 'nudge'])], [('regression: curtain broken then blocked again', {'events': [[0, 'obstruct'], [5, 'unblock'], [15, 'obstruct'], [26, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 28', {'events': [[12, 'unblock'], [20, 'edge'], [32, 'edge'], [33, 'obstruct'], [35, 'obstruct'], [40, 'obstruct'], [41, 'obstruct'], [53, 'obstruct'], [58, 'closed']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'done']), ('control 29', {'events': [[8, 'edge'], [10, 'obstruct'], [12, 'obstruct'], [20, 'closed']]}, ['reopen', 'reopen', 'reopen', 'done']), ('boundary: curtain held for twenty seconds', {'events': [[0, 'obstruct'], [20, 'obstruct']]}, ['reopen', 'nudge']), ('control 23', {'events': [[1, 'unblock'], [6, 'unblock'], [18, 'obstruct'], [30, 'closed']]}, ['reopen', 'done']), ('sampled regression 26', {'events': [[12, 'closed'], [13, 'closed'], [15, 'obstruct'], [17, 'obstruct'], [19, 'obstruct']]}, ['done', 'done', 'reopen', 'reopen', 'nudge']), ('sampled regression 32', {'events': [[8, 'closed'], [13, 'unblock'], [15, 'obstruct'], [16, 'obstruct'], [17, 'obstruct'], [19, 'unblock'], [31, 'obstruct'], [36, 'obstruct']]}, ['done', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored'])], [('regression: closing clears nudging', {'events': [[0, 'obstruct'], [1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'done', 'reopen']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 48', {'events': [[2, 'obstruct'], [7, 'obstruct'], [15, 'obstruct'], [27, 'obstruct'], [35, 'unblock']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('sampled regression 64', {'events': [[8, 'obstruct'], [13, 'edge'], [18, 'unblock'], [26, 'unblock'], [34, 'obstruct'], [36, 'obstruct']]}, ['reopen', 'reopen', 'reopen', 'nudge']), ('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('sampled regression 34', {'events': [[8, 'edge'], [16, 'obstruct'], [24, 'obstruct'], [36, 'closed'], [48, 'obstruct'], [60, 'obstruct'], [62, 'obstruct'], [64, 'unblock'], [72, 'obstruct'], [80, 'unblock']]}, ['reopen', 'reopen', 'reopen', 'done', 'reopen', 'reopen', 'nudge', 'ignored']), ('control 37', {'events': [[2, 'closed'], [4, 'closed'], [9, 'obstruct'], [21, 'edge']]}, ['done', 'done', 'reopen', 'reopen']), ('control 40', {'events': [[2, 'closed'], [7, 'obstruct'], [15, 'edge'], [16, 'obstruct'], [18, 'closed']]}, ['done', 'reopen', 'reopen', 'reopen', 'done'])], [('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 72', {'events': [[12, 'obstruct'], [14, 'obstruct'], [15, 'unblock'], [20, 'obstruct'], [32, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('sampled regression 1', {'events': [[8, 'obstruct'], [13, 'closed'], [18, 'obstruct'], [26, 'edge'], [28, 'obstruct'], [29, 'obstruct'], [41, 'obstruct'], [42, 'obstruct'], [54, 'obstruct'], [66, 'closed']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']), ('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('control 45', {'events': [[5, 'edge'], [17, 'closed'], [22, 'obstruct'], [24, 'closed']]}, ['reopen', 'done', 'reopen', 'done']), ('sampled regression 48', {'events': [[2, 'obstruct'], [7, 'obstruct'], [15, 'obstruct'], [27, 'obstruct'], [35, 'unblock']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('control 51', {'events': [[8, 'closed'], [9, 'closed'], [14, 'obstruct'], [26, 'closed'], [38, 'obstruct']]}, ['done', 'done', 'reopen', 'done', 'reopen'])]]
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 fixture	Actual	Expected	Outcome
regression: third obstruction	`['reopen', 'reopen', 'reopen']`	`['reopen', 'reopen', 'nudge']`	Failed
boundary: edge contacts do not count	`['reopen', 'reopen', 'reopen', 'reopen']`	`['reopen', 'reopen', 'reopen', 'reopen']`	Passed
regression: closing clears nudging	`['reopen', 'reopen', 'reopen', 'done', 'reopen']`	`['reopen', 'reopen', 'nudge', 'done', 'reopen']`	Failed
sampled regression 1	`['reopen', 'done', 'reopen', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'done']`	`['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']`	Failed
regression: safety edge while nudging	`['reopen', 'reopen', 'reopen', 'reopen', 'nudge']`	`['reopen', 'reopen', 'nudge', 'reopen', 'ignored']`	Failed
control 4	`['reopen', 'reopen', 'done']`	`['reopen', 'reopen', 'done']`	Passed
control 7	`['reopen', 'reopen', 'reopen', 'reopen']`	`['reopen', 'reopen', 'reopen', 'reopen']`	Passed
sampled regression 10	`['reopen', 'reopen', 'reopen', 'reopen', 'reopen']`	`['reopen', 'reopen', 'reopen', 'reopen', 'nudge']`	Failed

SHA-256 / d0fa54837017071f0c150e408d233bcbccdebb96d13ba23b5d35fca0e23bef59

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(x):
    count = 0
    nudge = False
    block_start = None
    out = []
    for t, ev in x['events']:
        if ev == 'obstruct':
            if block_start is None:
                block_start = t
            if nudge:
                out.append('ignored')
            else:
                count += 1
                if count >= 3 or t - block_start >= 20:
                    nudge = True
                    out.append('nudge')
                else:
                    out.append('reopen')
        elif ev == 'unblock':
            block_start = None
        elif ev == 'edge':
            count += 1
            out.append('reopen')
        elif ev == 'closed':
            count = 0
            nudge = False
            block_start = None
            out.append('done')
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('regression: closing clears nudging', {'events': [[0, 'obstruct'], [1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'done', 'reopen']), ('sampled regression 1', {'events': [[8, 'obstruct'], [13, 'closed'], [18, 'obstruct'], [26, 'edge'], [28, 'obstruct'], [29, 'obstruct'], [41, 'obstruct'], [42, 'obstruct'], [54, 'obstruct'], [66, 'closed']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']), ('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('control 4', {'events': [[5, 'edge'], [10, 'unblock'], [11, 'obstruct'], [19, 'closed']]}, ['reopen', 'reopen', 'done']), ('control 7', {'events': [[2, 'unblock'], [10, 'edge'], [18, 'obstruct'], [23, 'unblock'], [28, 'edge'], [33, 'obstruct']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 10', {'events': [[8, 'edge'], [13, 'obstruct'], [18, 'edge'], [30, 'unblock'], [35, 'obstruct'], [40, 'obstruct'], [42, 'unblock']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'nudge'])], [('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 17', {'events': [[5, 'unblock'], [13, 'unblock'], [14, 'closed'], [26, 'obstruct'], [34, 'edge'], [36, 'obstruct'], [48, 'unblock'], [60, 'obstruct'], [72, 'unblock']]}, ['done', 'reopen', 'reopen', 'reopen', 'nudge']), ('sampled regression 13', {'events': [[5, 'unblock'], [13, 'obstruct'], [21, 'closed'], [29, 'edge'], [34, 'obstruct'], [46, 'obstruct'], [47, 'unblock'], [55, 'obstruct'], [63, 'closed'], [64, 'unblock']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'done']), ('boundary: new cycle after closing', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct'], [5, 'unblock']]}, ['reopen', 'reopen', 'done', 'reopen']), ('control 12', {'events': [[5, 'obstruct'], [13, 'edge'], [15, 'unblock'], [16, 'obstruct'], [21, 'unblock'], [22, 'edge'], [30, 'closed'], [32, 'obstruct'], [44, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'done', 'reopen', 'reopen']), ('sampled regression 15', {'events': [[8, 'obstruct'], [9, 'obstruct'], [10, 'obstruct'], [11, 'unblock'], [16, 'obstruct'], [24, 'obstruct'], [29, 'edge']]}, ['reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'reopen']), ('sampled regression 18', {'events': [[12, 'obstruct'], [20, 'obstruct'], [22, 'obstruct']]}, ['reopen', 'reopen', 'nudge'])], [('regression: curtain broken then blocked again', {'events': [[0, 'obstruct'], [5, 'unblock'], [15, 'obstruct'], [26, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 28', {'events': [[12, 'unblock'], [20, 'edge'], [32, 'edge'], [33, 'obstruct'], [35, 'obstruct'], [40, 'obstruct'], [41, 'obstruct'], [53, 'obstruct'], [58, 'closed']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'done']), ('control 29', {'events': [[8, 'edge'], [10, 'obstruct'], [12, 'obstruct'], [20, 'closed']]}, ['reopen', 'reopen', 'reopen', 'done']), ('boundary: curtain held for twenty seconds', {'events': [[0, 'obstruct'], [20, 'obstruct']]}, ['reopen', 'nudge']), ('control 23', {'events': [[1, 'unblock'], [6, 'unblock'], [18, 'obstruct'], [30, 'closed']]}, ['reopen', 'done']), ('sampled regression 26', {'events': [[12, 'closed'], [13, 'closed'], [15, 'obstruct'], [17, 'obstruct'], [19, 'obstruct']]}, ['done', 'done', 'reopen', 'reopen', 'nudge']), ('sampled regression 32', {'events': [[8, 'closed'], [13, 'unblock'], [15, 'obstruct'], [16, 'obstruct'], [17, 'obstruct'], [19, 'unblock'], [31, 'obstruct'], [36, 'obstruct']]}, ['done', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored'])], [('regression: closing clears nudging', {'events': [[0, 'obstruct'], [1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'done', 'reopen']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 48', {'events': [[2, 'obstruct'], [7, 'obstruct'], [15, 'obstruct'], [27, 'obstruct'], [35, 'unblock']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('sampled regression 64', {'events': [[8, 'obstruct'], [13, 'edge'], [18, 'unblock'], [26, 'unblock'], [34, 'obstruct'], [36, 'obstruct']]}, ['reopen', 'reopen', 'reopen', 'nudge']), ('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('sampled regression 34', {'events': [[8, 'edge'], [16, 'obstruct'], [24, 'obstruct'], [36, 'closed'], [48, 'obstruct'], [60, 'obstruct'], [62, 'obstruct'], [64, 'unblock'], [72, 'obstruct'], [80, 'unblock']]}, ['reopen', 'reopen', 'reopen', 'done', 'reopen', 'reopen', 'nudge', 'ignored']), ('control 37', {'events': [[2, 'closed'], [4, 'closed'], [9, 'obstruct'], [21, 'edge']]}, ['done', 'done', 'reopen', 'reopen']), ('control 40', {'events': [[2, 'closed'], [7, 'obstruct'], [15, 'edge'], [16, 'obstruct'], [18, 'closed']]}, ['done', 'reopen', 'reopen', 'reopen', 'done'])], [('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 72', {'events': [[12, 'obstruct'], [14, 'obstruct'], [15, 'unblock'], [20, 'obstruct'], [32, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('sampled regression 1', {'events': [[8, 'obstruct'], [13, 'closed'], [18, 'obstruct'], [26, 'edge'], [28, 'obstruct'], [29, 'obstruct'], [41, 'obstruct'], [42, 'obstruct'], [54, 'obstruct'], [66, 'closed']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']), ('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('control 45', {'events': [[5, 'edge'], [17, 'closed'], [22, 'obstruct'], [24, 'closed']]}, ['reopen', 'done', 'reopen', 'done']), ('sampled regression 48', {'events': [[2, 'obstruct'], [7, 'obstruct'], [15, 'obstruct'], [27, 'obstruct'], [35, 'unblock']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('control 51', {'events': [[8, 'closed'], [9, 'closed'], [14, 'obstruct'], [26, 'closed'], [38, 'obstruct']]}, ['done', 'done', 'reopen', 'done', 'reopen'])]]
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 fixture	Actual	Expected	Outcome
regression: third obstruction	`['reopen', 'reopen', 'nudge']`	`['reopen', 'reopen', 'nudge']`	Passed
boundary: edge contacts do not count	`['reopen', 'reopen', 'nudge', 'reopen']`	`['reopen', 'reopen', 'reopen', 'reopen']`	Failed
regression: closing clears nudging	`['reopen', 'reopen', 'nudge', 'done', 'reopen']`	`['reopen', 'reopen', 'nudge', 'done', 'reopen']`	Passed
sampled regression 1	`['reopen', 'done', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'ignored', 'done']`	`['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']`	Failed
regression: safety edge while nudging	`['reopen', 'reopen', 'nudge', 'reopen', 'ignored']`	`['reopen', 'reopen', 'nudge', 'reopen', 'ignored']`	Passed
control 4	`['reopen', 'reopen', 'done']`	`['reopen', 'reopen', 'done']`	Passed
control 7	`['reopen', 'reopen', 'reopen', 'nudge']`	`['reopen', 'reopen', 'reopen', 'reopen']`	Failed
sampled regression 10	`['reopen', 'reopen', 'reopen', 'nudge', 'ignored']`	`['reopen', 'reopen', 'reopen', 'reopen', 'nudge']`	Failed

SHA-256 / f09cdddb3d219ff33811879b9731bbad9a86cb98adc12835bf8f6b96d966b43a

3 / The verified repair

Exit 0

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

N = 1
observations = []
def solve(x):
    count = 0
    nudge = False
    block_start = None
    out = []
    for t, ev in x['events']:
        if ev == 'obstruct':
            if block_start is None:
                block_start = t
            if nudge:
                out.append('ignored')
            else:
                count += 1
                if count >= 3 or t - block_start >= 20:
                    nudge = True
                    out.append('nudge')
                else:
                    out.append('reopen')
        elif ev == 'unblock':
            block_start = None
        elif ev == 'edge':
            out.append('reopen')
        elif ev == 'closed':
            count = 0
            nudge = False
            block_start = None
            out.append('done')
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('regression: closing clears nudging', {'events': [[0, 'obstruct'], [1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'done', 'reopen']), ('sampled regression 1', {'events': [[8, 'obstruct'], [13, 'closed'], [18, 'obstruct'], [26, 'edge'], [28, 'obstruct'], [29, 'obstruct'], [41, 'obstruct'], [42, 'obstruct'], [54, 'obstruct'], [66, 'closed']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']), ('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('control 4', {'events': [[5, 'edge'], [10, 'unblock'], [11, 'obstruct'], [19, 'closed']]}, ['reopen', 'reopen', 'done']), ('control 7', {'events': [[2, 'unblock'], [10, 'edge'], [18, 'obstruct'], [23, 'unblock'], [28, 'edge'], [33, 'obstruct']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 10', {'events': [[8, 'edge'], [13, 'obstruct'], [18, 'edge'], [30, 'unblock'], [35, 'obstruct'], [40, 'obstruct'], [42, 'unblock']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'nudge'])], [('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 17', {'events': [[5, 'unblock'], [13, 'unblock'], [14, 'closed'], [26, 'obstruct'], [34, 'edge'], [36, 'obstruct'], [48, 'unblock'], [60, 'obstruct'], [72, 'unblock']]}, ['done', 'reopen', 'reopen', 'reopen', 'nudge']), ('sampled regression 13', {'events': [[5, 'unblock'], [13, 'obstruct'], [21, 'closed'], [29, 'edge'], [34, 'obstruct'], [46, 'obstruct'], [47, 'unblock'], [55, 'obstruct'], [63, 'closed'], [64, 'unblock']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'done']), ('boundary: new cycle after closing', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct'], [5, 'unblock']]}, ['reopen', 'reopen', 'done', 'reopen']), ('control 12', {'events': [[5, 'obstruct'], [13, 'edge'], [15, 'unblock'], [16, 'obstruct'], [21, 'unblock'], [22, 'edge'], [30, 'closed'], [32, 'obstruct'], [44, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'done', 'reopen', 'reopen']), ('sampled regression 15', {'events': [[8, 'obstruct'], [9, 'obstruct'], [10, 'obstruct'], [11, 'unblock'], [16, 'obstruct'], [24, 'obstruct'], [29, 'edge']]}, ['reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'reopen']), ('sampled regression 18', {'events': [[12, 'obstruct'], [20, 'obstruct'], [22, 'obstruct']]}, ['reopen', 'reopen', 'nudge'])], [('regression: curtain broken then blocked again', {'events': [[0, 'obstruct'], [5, 'unblock'], [15, 'obstruct'], [26, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 28', {'events': [[12, 'unblock'], [20, 'edge'], [32, 'edge'], [33, 'obstruct'], [35, 'obstruct'], [40, 'obstruct'], [41, 'obstruct'], [53, 'obstruct'], [58, 'closed']]}, ['reopen', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'done']), ('control 29', {'events': [[8, 'edge'], [10, 'obstruct'], [12, 'obstruct'], [20, 'closed']]}, ['reopen', 'reopen', 'reopen', 'done']), ('boundary: curtain held for twenty seconds', {'events': [[0, 'obstruct'], [20, 'obstruct']]}, ['reopen', 'nudge']), ('control 23', {'events': [[1, 'unblock'], [6, 'unblock'], [18, 'obstruct'], [30, 'closed']]}, ['reopen', 'done']), ('sampled regression 26', {'events': [[12, 'closed'], [13, 'closed'], [15, 'obstruct'], [17, 'obstruct'], [19, 'obstruct']]}, ['done', 'done', 'reopen', 'reopen', 'nudge']), ('sampled regression 32', {'events': [[8, 'closed'], [13, 'unblock'], [15, 'obstruct'], [16, 'obstruct'], [17, 'obstruct'], [19, 'unblock'], [31, 'obstruct'], [36, 'obstruct']]}, ['done', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored'])], [('regression: closing clears nudging', {'events': [[0, 'obstruct'], [1, 'obstruct'], [2, 'obstruct'], [3, 'closed'], [4, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'done', 'reopen']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 48', {'events': [[2, 'obstruct'], [7, 'obstruct'], [15, 'obstruct'], [27, 'obstruct'], [35, 'unblock']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('sampled regression 64', {'events': [[8, 'obstruct'], [13, 'edge'], [18, 'unblock'], [26, 'unblock'], [34, 'obstruct'], [36, 'obstruct']]}, ['reopen', 'reopen', 'reopen', 'nudge']), ('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('sampled regression 34', {'events': [[8, 'edge'], [16, 'obstruct'], [24, 'obstruct'], [36, 'closed'], [48, 'obstruct'], [60, 'obstruct'], [62, 'obstruct'], [64, 'unblock'], [72, 'obstruct'], [80, 'unblock']]}, ['reopen', 'reopen', 'reopen', 'done', 'reopen', 'reopen', 'nudge', 'ignored']), ('control 37', {'events': [[2, 'closed'], [4, 'closed'], [9, 'obstruct'], [21, 'edge']]}, ['done', 'done', 'reopen', 'reopen']), ('control 40', {'events': [[2, 'closed'], [7, 'obstruct'], [15, 'edge'], [16, 'obstruct'], [18, 'closed']]}, ['done', 'reopen', 'reopen', 'reopen', 'done'])], [('regression: third obstruction', {'events': [[1, 'obstruct'], [2, 'unblock'], [3, 'obstruct'], [4, 'unblock'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge']), ('boundary: edge contacts do not count', {'events': [[1, 'obstruct'], [2, 'edge'], [3, 'unblock'], [4, 'obstruct'], [5, 'edge']]}, ['reopen', 'reopen', 'reopen', 'reopen']), ('sampled regression 72', {'events': [[12, 'obstruct'], [14, 'obstruct'], [15, 'unblock'], [20, 'obstruct'], [32, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('sampled regression 1', {'events': [[8, 'obstruct'], [13, 'closed'], [18, 'obstruct'], [26, 'edge'], [28, 'obstruct'], [29, 'obstruct'], [41, 'obstruct'], [42, 'obstruct'], [54, 'obstruct'], [66, 'closed']]}, ['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']), ('regression: safety edge while nudging', {'events': [[1, 'obstruct'], [2, 'obstruct'], [3, 'obstruct'], [4, 'edge'], [5, 'obstruct']]}, ['reopen', 'reopen', 'nudge', 'reopen', 'ignored']), ('control 45', {'events': [[5, 'edge'], [17, 'closed'], [22, 'obstruct'], [24, 'closed']]}, ['reopen', 'done', 'reopen', 'done']), ('sampled regression 48', {'events': [[2, 'obstruct'], [7, 'obstruct'], [15, 'obstruct'], [27, 'obstruct'], [35, 'unblock']]}, ['reopen', 'reopen', 'nudge', 'ignored']), ('control 51', {'events': [[8, 'closed'], [9, 'closed'], [14, 'obstruct'], [26, 'closed'], [38, 'obstruct']]}, ['done', 'done', 'reopen', 'done', 'reopen'])]]
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 fixture	Actual	Expected	Outcome
regression: third obstruction	`['reopen', 'reopen', 'nudge']`	`['reopen', 'reopen', 'nudge']`	Passed
boundary: edge contacts do not count	`['reopen', 'reopen', 'reopen', 'reopen']`	`['reopen', 'reopen', 'reopen', 'reopen']`	Passed
regression: closing clears nudging	`['reopen', 'reopen', 'nudge', 'done', 'reopen']`	`['reopen', 'reopen', 'nudge', 'done', 'reopen']`	Passed
sampled regression 1	`['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']`	`['reopen', 'done', 'reopen', 'reopen', 'reopen', 'nudge', 'ignored', 'ignored', 'ignored', 'done']`	Passed
regression: safety edge while nudging	`['reopen', 'reopen', 'nudge', 'reopen', 'ignored']`	`['reopen', 'reopen', 'nudge', 'reopen', 'ignored']`	Passed
control 4	`['reopen', 'reopen', 'done']`	`['reopen', 'reopen', 'done']`	Passed
control 7	`['reopen', 'reopen', 'reopen', 'reopen']`	`['reopen', 'reopen', 'reopen', 'reopen']`	Passed
sampled regression 10	`['reopen', 'reopen', 'reopen', 'reopen', 'nudge']`	`['reopen', 'reopen', 'reopen', 'reopen', 'nudge']`	Passed

SHA-256 / 50ef08450272a33d524f062f94f8e6b05a4ce7b3f17e787d89a161763993adc4

Verification & scope

Stipulated toy lift-control contract for a bounded teaching model; it makes no claim of conformance to any lift code or vendor dispatcher and omits real safety cases. 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 2026-09-29T14:47:54.670933+00:00.

Case digest / f4554cba986d6d2e74cb03a369ba8d32b87bdf242f310bd3da90f7012dcea56a