Update README.md

README.md

@@ -87,10 +87,12 @@ Every row of the dataset contains the following fields:
 - **`Popularity`**: `int`, a number between `100` (best) and `-100` (worst), calculated as `100 * (upvotes - downvotes)/(upvotes + downvotes)`. Votes are weighted by various factors such as whether the puzzle was solved successfully or the solver's puzzle rating in comparison to the puzzle's.
 - **`NbPlays`**: `int`, the number of times a puzzle was played.
 - **`Themes`**: `string`, a space separated list of puzzle themes.
-- **`GameUrl`**: `string`, the link to the specific game and move the puzzle was taken from.
+- **`GameUrl`**: `string`, the link to the specific game and move the puzzle was extracted from.
 - **`OpeningTags`**: `string`, a space separated list of openings. This is only set for puzzles starting before move 20.
 
 ## Additional Information
 - For a list of all possible puzzle themes and their description: [puzzleTheme.xml](https://github.com/ornicar/lila/blob/master/translation/source/puzzleTheme.xml)
+- To better understand puzzle themes, check out this study: https://lichess.org/study/viiWlKjv
 - For a list of all possible openings: https://github.com/lichess-org/chess-openings
-<!-- TODO: link to https://lichess.org/@/lichess/blog/new-puzzles-are-here/X-S6gRUA and https://lichess.org/study/viiWlKjv -->
+- For the blog post introducing puzzles from 2020: [blog/new-puzzles-are-here](https://lichess.org/@/lichess/blog/new-puzzles-are-here/X-S6gRUA)
+- For the blog post analyzing Lichess puzzle usage from 2021: [blog/some-puzzling-analysis](https://lichess.org/@/Lichess/blog/some-puzzling-analysis/YAMFfhUA)