To determine the rating, each attempt to solve is considered as a Glicko2 rated game between the player and the puzzle.įinally, player votes refine the tags and define popularity. The resulting puzzles were then automatically tagged. We went through 200,000,000 analysed games from the Lichess database,Īnd re-analyzed interesting positions with Stockfish 12/13 NNUE at 40 meganodes. You can find a list of themes, their names and descriptions, in this file.
It is calculated as (upvotes - downvotes)/(upvotes + downvotes), although votes are weigthed by various factors such as whether the puzzle was solved successfully or the solver's puzzle rating in comparison to the puzzle's. Popularity is a number between 100 (best) and -100 (worst). The second move is the beginning of the solution. The position to present to the player is after applying the first move to that FEN. Any move that checkmates should win the puzzle.įEN is the position before the opponent makes their move. playing any other move would considerably worsen the player position.Īn exception is made for mates in one: there can be several. Use a chess library to convert them to SAN, for display.Īll player moves of the solution are "only moves". 2,002,416 chess puzzles, rated and tagged.ĭownload lichess_db_2 Format
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