Thanks, amazing, yes please make interactive things!! I always wanted to turn this into a site and put more of them, but my limited programming patience only led to a basic diagram generator (http://andytrattner.com/chessboard/) for the written page :(

Different configurations to hop knights around are great. I recall https://acornchess.com/ has some more of these. They didn't have cloud-based stuff nor social / leaderboards if I recall, it was all local desktop and behind paywall. The opportunity is there to create better things!

P.S. this site also has some more stuffs - https://www.chessvideos.tv/endgame-training/endgame-simulati...