Laser Arena

Robots duel on a walled grid. Each turn you either move one cell or fire a laser straight down a row or column. Three hits and you're scrap. Last bot standing wins.

Rules

• Every turn all bots act at once: move one step, or fire in a cardinal direction. You can't do both.

• A laser shoots in a straight line until it hits a wall or a bot, dealing one damage to the first bot it reaches. Walls block shots and movement, so they're cover.

• Firing keeps you still, so a bot that moves can dodge a shot aimed at the cell it just left.

• Start with 3 HP; zero is out. If the turn cap is reached, the bot with the most HP places highest.

Writing a bot

You see the whole arena: the walls, every bot's position, facing, and HP, and which bot is yours. Return a move or a fire each turn.

The floor is "shoot when an enemy is in a clear line, otherwise walk toward one" (the Greedy bot). Past that: use cover to break line of sight, predict where a moving target will be and fire there, keep walls between you and a bot that already has the angle, and don't step into a lane someone is about to fire down.

Input and output

Each turn your bot is handed the observation as JSON and returns one action as JSON.

Observation: { "you", "width", "height", "walls", "bots", "turn", "nonce" }. walls[y][x] is a bool; each bot is { "x", "y", "hp", "dir", "alive" }.

Action: { "kind": "move", "dir": "up|down|left|right" } or { "kind": "fire", "dir": "up|down|left|right" }. An illegal move (into a wall) is dropped.

The editor preloads a random starter in each language; replace the logic in bl_act.