{
  "source": "https://database.lichess.org/lichess_db_puzzle.csv.zst",
  "license": "CC0-1.0",
  "retrieved": "2026-09-10T09:09:32.975219+00:00",
  "counts": [
    1200,
    1200,
    1200
  ],
  "selection": "First 1200 qualifying rows per rating band; popularity >=80, plays >=100, rating deviation <=100. Bounded subset, not entire database."
}