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chesscom-api

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850k+ chess.com tactics puzzles: every position, its solution (TCN and PGN), rating, pass rate and solve time. Half are rated under 1200, the hardest near 4600. Free puzzles shouldn't sit behind a paywall. JSON and CSV, keyed by id or position. No daily puzzles. Snapshot from August 2026. Format and a TCN decoder in the README.

  • Updated Aug 19, 2026

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