Quatrochess - Wikipedia

List of chess variants - Wikipedia

List of chess variants - Wikipedia

4 Player Chess - Chess Terms

Shogi - Turkcewiki.org

Main Tabletop games in the World

Main Tabletop games in the World

File:Three-Man Chess gameboard and starting position.PNG - Wikipedia

List of chess variants - Wikipedia

What would be the approximate value of a chess piece that moved like a king, but didn't result in checkmate if lost? - Quora

List Of Chess Variants: Most Up-to-Date Encyclopedia, News & Reviews

Triangular Chess Game: Most Up-to-Date Encyclopedia, News & Reviews