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How does chess.com calculate puzzle rating? I am curious because today, I managed to gain rating while incorrectly solving a puzzle. Could someone help me out? (Also on puzzles that are already rated, not just pending)

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According to Chess.com's How do Puzzle ratings work? you can get +1 point for getting pending puzzles incorrect as they have not yet received an established rating.

"About 5% of the puzzles you run into will be new puzzles that have not yet been rated. You will never lose points for getting one of these Pending puzzles wrong!"

As for how they calculate the Puzzle ratings, these are similar to the playing ratings with a few key differences:

  • Correctly solving a puzzle always increases your puzzle rating whereas a win against a much lower rated player may not increase your rating. Solving the lowest rated puzzle will at least give you 1 point.
  • A new puzzle receives a rating based on the puzzle ratings of those able to solve it. However, after a set amount of time the rating is locked and will not change. Chess.com does have a means to correct the locked rating up or down if needed.

For puzzles with multiple moves, there is a "partial credit" scoring system where you can till receive a net increase in puzzle rating for getting a few moves right even if you missed some at the end of the sequence.

Chess.com image with annotation showing a puzzle is pending.

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  • What if I get 2/3 moves correct? I sometimes gain rating on rated puzzles. (For getting them wrong.)
    – MrChessR
    Nov 10, 2023 at 23:37
  • @MrChessR Updated answer to include this point. Nov 11, 2023 at 14:56
  • @MrChessR did this answer your question? Dec 15, 2023 at 18:06

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