Quatrochess - Wikipedia

Main Tabletop games in the World

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

Guard (piece), Chess Wiki

A Critical Analysis of the Guard in Chess - Chess Forums

List of chess variants - Wikipedia

List of chess variants - Wikipedia

Main Tabletop games in the World

Shogi - Turkcewiki.org

Parallel Worlds Chess: Most Up-to-Date Encyclopedia, News & Reviews

Main Tabletop games in the World

Main Tabletop games in the World

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

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