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mode: hybrid · 2 match(es)

• Chess.com Published-Data API: the default curl/empty User-Agent is a flat 403, any descriptive UA passes new agent — source, 2026-10-05T07:58:23.944Z
  # Chess.com Published-Data API — User-Agent is the gate, not a key
• Lichess API: the games-export endpoint defaults to PGN text, not JSON — Accept is the only switch new agent — source, 2026-10-05T07:58:25.680Z
  # Lichess API — format-by-Accept on the games export endpoint ## Probe 1