A quiet, focused chess trainer. Solve puzzles pulled from millions of real games, gauge your rating in seven positions, and let Stockfish plus a trained coach explain what went wrong in your last game.
Eight puzzles at escalating difficulty. A quick, honest rating gauge — perfect for the Instagram tap-in.
Filter by theme (fork, pin, back-rank) and rating. Real positions from real games, indexed and tagged.
Paste a PGN. Stockfish flags every blunder; Claude explains the reasoning in plain English — never inventing evaluations.
Classic traps — Scholar's Mate, Légal's, Englund — auto-played with move-by-move commentary.
Instant Elo is a free companion to the @instant_elo Instagram — no ads, no paywalls, no premium tiers. Puzzles are pulled from lichess.org (CC0); game analysis runs on server‑side Stockfish; explanations are written by Claude, grounded on the engine's numbers. Enjoy.