Puzzles with more than one solution.
A solver found a real checkmate and the site told them to try again. The puzzle had two answers, and the grader knew one. Mate puzzles now follow the rule lichess settled on: every move of the solution must be the only mating move, except the last, where any mate counts. The 382 served puzzles that failed it are withdrawn, and the article walks through the position that started it.








