user19090: I'm getting back into chess, and I'd like a way to create and store multiple chess positions to review. Specifically, I want to review and practice mating nets. There are a ton of chess tactics sites that offer tactics training, but I want to be able to create and review specific types of positions. Does anyone have suggestions?

user24039: If you have a PGN file of those position you could use my site for that. There are already a couple of people using the site not to study openings but have uploaded PGNs of endgame positions to train.
If your PGN software specifies a starting position not inside of a "FEN" header let me know: https://github.com/ArneVogel/listudy/issues/2

19090: <p>I'm getting back into chess, and I'd like a way to create and store multiple chess positions to review. Specifically, I want to review and practice mating nets. There are a ton of chess tactics sites that offer tactics training, but I want to be able to create and review specific types of positions. Does anyone have suggestions?</p>
 24039: <p>If you have a PGN file of those position you could use <a href="https://listudy.org/en" rel="nofollow noreferrer">my site</a> for that. There are already a couple of people using the site not to study openings but have uploaded PGNs of endgame positions to train.</p>
<p>If your PGN software specifies a starting position not inside of a &quot;FEN&quot; header let me know: <a href="https://github.com/ArneVogel/listudy/issues/2" rel="nofollow noreferrer">https://github.com/ArneVogel/listudy/issues/2</a></p>
