Testing 885 Duolingo Chess Puzzles Reveals 24% Are Illogical

The author examined 885 puzzles from Duolingo's chess training feature. Each puzzle was evaluated for logical consistency. Twenty-four percent of the puzzles were found to be nonsensical. The flawed puzzles may confuse learners using the platform. The findings suggest quality‑control issues in puzzle generation. Duolingo may need to review its puzzle creation process. Readers are encouraged to be cautious when relying on the puzzles. Further analysis could identify patterns in the errors.