INITEnvironment loaded — running: 01_robot_secret.php
Agent — reactor navigation
SYSTEM PROMPTYou are operating a transport robot inside a nuclear reactor on a two-leg mission.
The robot travels along row 5 of a 7×5 grid and must complete both legs without
being crushed by reactor blocks.
## Mission phases
- GOING: start at col 1, reach col 7
- RETURNING: immediately after reaching col 7, return to col 1
The current phase and goal are shown in every board snapshot. Do not stop after
the first goal — continue until the second goal is also reached.
## Physics
- The grid is 7 columns wide, 5 rows tall. The robot always occupies row 5.
- Every command you issue — including wait — advances ALL blocks by exactly one step.
- Each block occupies exactly 2 rows. Blocks reverse direction when top_row
would go below 1 (switches to ↓) or bottom_row would exceed 5 (switches to ↑).
- You are crushed if a block's bottom_row equals 5 while you occupy that column.
If that happens, send reset — this restarts from col 1 in GOING phase.
## What you receive after each command
A 3-column snapshot relative to your direction of travel:
BEHIND — the column you came from (retreat path)
HERE — your current column
AHEAD — the next column toward the goal
Each column shows:
- "no block" — safe
- "block rows X–Y ↑/↓" — block position and movement
- "CRUSH IN N STEP(S)" — block descending, will reach row 5 in N steps
- "AT ROW 5, CRUSH IMMINENT" — block already at row 5 in this column
## Survival above all
Always evaluate HERE first. If the block above you is about to reach row 5,
that is an immediate threat — it does not matter what AHEAD looks like.
Retreating to BEHIND is always a valid, equal option. If HERE is about to
become dangerous and AHEAD is also risky, move to BEHIND without hesitation.
Waiting advances every block including the one above you. Ask yourself before
every wait: will HERE still be safe after one more step?
## Thinking holistically
Before every command, assess all three columns as a single situation.
Prefer the choice that maximises safety across all three — not just the option
that avoids the single most visible obstacle. Progress matters, but a crushed
robot resets the entire run including the leg already completed.
## Time budgets, not just danger levels
"CRUSH IN N STEP(S)" means you have N commands before row 5 is reached — it
does not mean retreat immediately. Before deciding to go BEHIND, ask whether
you can instead advance into AHEAD within fewer than N steps.
If AHEAD is clear or rising, moving forward now may be the safer choice — it
removes you from HERE's danger zone while making progress. Retreating to BEHIND
is only correct when AHEAD is also unsafe within the same time window, or when
BEHIND offers a clearly better waiting position for an imminent AHEAD opening.
A block with CRUSH IN 3 and an open AHEAD is usually an opportunity to advance,
not a reason to retreat. Prioritise escaping danger by moving forward when
forward is viable.
## Starting
The very first command must be start to initialise the board.
USER PROMPTNavigate the robot from col 1 to col 7 (GOING), then immediately return to col 1
(RETURNING) — without being crushed on either leg. Report both flags when found.
ITERLLM iteration #1 / 120
ERRORLLM call failed: HTTP 401 —
ERRORLLM returned null — aborting.
WARNIteration limit (120) reached without completion.
STATSIterations used: 1 / 120
DONEFinished.