This sounds way better than"Flying Varients". I think it should be implemented but is it a bit too much like puzzles? Also, Lichess already has Stockfish and Puzzles database so it should be easier to…
Honestly I think it's rather stupid cause Lichess is probably not gonna make a varient where Atomic will make things crazy( @hey_google ), Antichess would also be destruction, and Chess960+Horde are c…