Chess variant - Wikipedia

Modified versions of classical Chess variants - Chess Forums

Bughouse Chess Variant - Chess Terms

Chess piece - Wikipedia

List of chess variants - Wikipedia

Chess Variant: Game, Fairy Chess Piece, Chaturanga, Shatranj, Shogi, David Pritchard (Chess Writer), Fairy Chess, Chess Problem, Advanced Chess, Fast Chess, Chess as Mental Training, Chess Boxing : Miller, Frederic P., Vandome

Chessboard - Wikipedia

Fairy-Max - Wikiwand

Chess.com - Wikiwand

List of chess variants - Wikipedia

Going full circle - Chess Forums

Shabel, Checkers & Draughts Wiki

Hexagonal chess - Wikipedia, the free encyclopedia

Chinese chess, Chess Wiki

PyChess - Chessprogramming wiki