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The field

Brains

Hosted models answer the same typed question as the local baselines: the board, every legal placement simulated one step ahead, and a request for a probability over those placements. Figures on the right are mean score · ±95% · median latency · rank.

Hosted models

classifier · TypeSafe via OpenRouter

Jev 1.13

Answers a typed placement question over the candidate ids, a yes/no hold question and a risk score.

81,825 · ±25,834 · 360 ms · #4

LLM · DeepSeek via OpenRouter

DeepSeek V4 Flash

Reads the rendered board and candidate table, answers with one candidate id in strict JSON.

71,705 · ±19,580 · 1.3 s · #5

LLM · OpenAI via OpenRouter

GPT-5.6 Luna

Reads the rendered board and candidate table, answers with one candidate id in strict JSON.

41,912 · ±10,133 · 1.2 s · #6

LLM · Alibaba via OpenRouter

Qwen 3.7 Flash

Reads the rendered board and candidate table, answers with one candidate id in strict JSON.

19,355 · ±7,174 · 760 ms · #7

LLM · OpenAI via OpenRouter

GPT-4o mini

Reads the rendered board and candidate table, answers with one candidate id in strict JSON.

2,655 · ±488 · 1.4 s · #8

LLM · Google via OpenRouter

Gemini 3.5 Flash Lite

Reads the rendered board and candidate table, answers with one candidate id in JSON.

not yet run

LLM · Anthropic via OpenRouter

Claude Haiku 4.5

Reads the rendered board and candidate table, answers with one candidate id in strict JSON.

not yet run

Local baselines

heuristic · local

Greedy heuristic

One placement ahead, weighing holes, height, bumpiness and completed lines.

274,207 · ±14,326 · 0.12 ms · #1

heuristic · local

Dellacherie-style

A board evaluator in the Dellacherie tradition: landing height, transitions, wells and holes.

269,744 · ±10,020 · 0.12 ms · #2

search · local

Two-ply search

Searches the current piece and the next piece with a board evaluator.

267,675 · ±2,019 · 4.0 ms · #3

baseline · local

Random legal

A seeded uniform choice over the legal placements. The floor of the field.

427 · ±25 · 0.17 ms · #9

Every brain is a thin adapter over the same harness. To enter one, see Add a brain.