It is calculated as 100 * (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". 3,314,253 chess puzzles, rated and tagged.ĭownload lichess_db_ Format
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