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Observable browser stealth game where Jev supplies batched typed judgments for six guards while deterministic code owns the simulation and validates every proposal; includes a Decision Lens, scripted offline mode, evidence traces, tests, and one documented live sandbox extraction.
Anyone can play Jev on a shared chessboard. One Choice question covers every legal move; probabilities shade the board. Its confidence panel uses a narrow, one-ply material check. Source is closed.
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