Variants Puzzles and others: https://chessvariants.training/
https://altcodeunicode.com/alt-codes-math-symbols-italic-letters/
FoW: https://www.chess.com/blog/Illingworth/fog-of-war-chess-grandmaster-strategy
some crazyhouse study for future reference: https://lichess.org/study/OHSQPWgG
Клубови
PRO Chess League
21.058 чланова
The RAR Newspaper Archives
29 чланова
Chess University
114.105 чланова
Xio Succ
2 члана
4 Player Chess
55.152 члана