---
title: "Jev Router plays Tokyo 1957 (seed 2) | Micropolis run | Evals by Jetty"
url: https://evaljetty.com/micropolis/runs/jev-tokyo-s2.html
description: "Jev Router as mayor in Micropolis, Tokyo 1957: monster attack: lost, city score 368. Timelapse, charts, every decision and the run's evaluation."
updated: 2026-09-28
publisher: Jetty (https://jetty.io)
---

02 — Run · Round 1 · Tokyo 1957: monster attack · jev-tokyo-s2

# Jev Router plays Tokyo 1957

A monster attacks Tokyo in 1957. Rebuild and get the city score above 500 within 5 years. Ended Jan 1962: lost, city score 368.

[Decision log](https://evaljetty.com/micropolis/runs/jev-tokyo-s2/decisions.jsonl)[City stats (CSV)](https://evaljetty.com/micropolis/runs/jev-tokyo-s2/series.csv)[Save file (.cty)](https://evaljetty.com/micropolis/runs/jev-tokyo-s2/city.cty)[Final map (PNG)](https://evaljetty.com/micropolis/runs/jev-tokyo-s2/final_map.png)[Runtime config](https://evaljetty.com/micropolis/runs/jev-tokyo-s2/runtime_config.json)[Validation report](https://evaljetty.com/micropolis/runs/jev-tokyo-s2/validation_report.json)

GOAL MISSED seed 2

Jev Router

typesafe/jev-router

LOST: City score 368 (goal > 500); engine verdict: lost

Population (start → end)113,100 → 21,900
Peak population113,100City score (start → end)500 → 368
Funds at the end$0Crime / pollution / traffic18 / 54 / 4
Zones R / C / I132 / 92 / 79
Power plants (coal / nuclear)8 / 0Police / fire stations17 / 11
Turns (model / failed)20 (20 / 3)
Actions applied / rejected53 / 0
Mean turn latency30.1sModel cost$0.647Wall clock10.1 min
Jetty run IDd78fe456

## The city over time

### Population

People, after every turn

### Funds

Treasury, after every turn

### City score

0–1000, re-evaluated each January

Table view

| Turn | Date | Population | Funds | City score | Crime | Pollution |
| --- | --- | --- | --- | --- | --- | --- |
| 0 | Jan 1957 | 113,100 | $20,000 | 500 | 31 | 63 |
| 1 | Apr 1957 | 107,460 | $17,489 | 668 | 31 | 63 |
| 2 | Jul 1957 | 103,060 | $17,489 | 668 | 73 | 65 |
| 3 | Oct 1957 | 98,120 | $15,929 | 668 | 69 | 71 |
| 4 | Jan 1958 | 93,580 | $11,869 | 619 | 69 | 71 |
| 5 | Apr 1958 | 87,940 | $11,846 | 619 | 59 | 74 |
| 6 | Jul 1958 | 83,320 | $11,846 | 619 | 56 | 67 |
| 7 | Oct 1958 | 77,240 | $11,846 | 619 | 56 | 67 |
| 8 | Jan 1959 | 71,400 | $8,903 | 474 | 52 | 66 |
| 9 | Apr 1959 | 65,320 | $8,881 | 474 | 49 | 64 |
| 10 | Jul 1959 | 58,680 | $5,805 | 474 | 49 | 62 |
| 11 | Oct 1959 | 52,420 | $5,759 | 474 | 41 | 62 |
| 12 | Jan 1960 | 47,800 | $0 | 389 | 35 | 61 |
| 13 | Apr 1960 | 44,120 | $0 | 389 | 35 | 59 |
| 14 | Jul 1960 | 39,920 | $0 | 389 | 30 | 59 |
| 15 | Oct 1960 | 36,740 | $0 | 389 | 27 | 56 |
| 16 | Jan 1961 | 33,400 | $0 | 375 | 27 | 55 |
| 17 | Apr 1961 | 30,200 | $0 | 375 | 24 | 53 |
| 18 | Jul 1961 | 27,400 | $0 | 375 | 21 | 53 |
| 19 | Oct 1961 | 24,920 | $0 | 375 | 21 | 56 |
| 20 | Jan 1962 | 21,380 | $0 | 368 | 18 | 54 |

## Final map

[![Final city map: Jev Router on Tokyo 1957: monster attack](https://evaljetty.com/micropolis/media/jev-tokyo-s2-map.jpg)](https://evaljetty.com/micropolis/runs/jev-tokyo-s2/final_map.png)

## Evaluation

failchecks **9/10** verdict: valid run (code checks and checklist) and task goal met (judge)

| Status | Kind | Check | Detail |
| --- | --- | --- | --- |
| pass | step | environment | Environment check (snapshot, engine, key) |
| pass | step | launch | Launch run-city as a detached process |
| pass | step | supervise | Supervise in the foreground until run-city exits |
| pass | step | render | Timelapse video rendered |
| pass | step | notes | Append Notes to summary.md |
| pass | code\_check | outputs-exist | all present |
| pass | code\_check | sim-reached-deadline | ended Jan 1962 after 20 turns; scenario verdict False |
| pass | code\_check | decisions-logged | 20 rows for 20 turns |
| pass | code\_check | llm-turns-valid | 3/20 model turns failed |
| pass | code\_check | video-decodes | duration 30.0s |
| pass | code\_check | limits-respected | 10.1 wall-minutes (model budget 45.0 min) |
| fail | judge | scenario-goal | LOST: City score 368 (goal > 500); engine verdict: lost (score 0 / threshold 1) |
| pass | checklist | notes-explain-outcome | summary.md Notes section cites model thoughts from turns 1, 12, and 20 explaining the financial collapse and score decline |
| pass | checklist | player-matches-request | result.json confirms player=jev, task=tokyo, seed=2 matching runbook parameters |
| pass | checklist | no-silent-outage | run.log shows continuous turn-by-turn progress with 3 failures within the 20% threshold, no long silent stretch |

## Decision timeline

What the mayor thought and did each turn. Click a turn to jump the timelapse there.

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Source: https://evaljetty.com/micropolis/runs/jev-tokyo-s2.html · Evals by Jetty · Run your own evals: https://jetty.io/?utm_source=evaljetty&utm_medium=llms