> Positions marked "1001" are taken from Fred Reinfeld's 1955 book 1001 Ways to Checkmate. How did you enter these positions into the app? Manually? One idea

> Positions marked "1001" are taken from Fred Reinfeld's 1955 book 1001 Ways to Checkmate. How did you enter these positions into the app? Manually? One idea you can try to avoid manual work: First, download a game database, like for example a Lichess database,[1] or a database of Masters games. After parsing the PGN, check if the game ended in checkmate. If so, then at the very least you have a Mate in 1 puzzle. Using your engine, you can check the last couple positions of the game to see if there was a longer forced mate. If the game didn't end in a checkmate, it's still possible the resignation was due to forced mate, so you can do a similar process to check the final position. By removing manual entry, you can add a lot more metadata that the user can search for to customize their training. For example, you could add the ability to train specifically on rook checkmates or knight checkmates, or queen sacrifices, or checkmates that occur in the back rank, or endgame checkmates (positions where there are few major pieces on the board). ^1: https://database.lichess.org/ https://database.lichess.org/