Cliff Pickover on X: Fortress chess is a 4-player chess variant

Chaturanga: Four-Player Chess With Dice - HobbyLark

Four-player chess - Wikipedia

Four-player chess variants – Green Chess

4-Player Chess In Four Charts

FORCHESS- Four-Person Chess Instructions

Four-Player Chess

Four-player chess - Chess Forums

4 Player Chess Board/checker Board - Norway

Chess.com on X: Have you tried newest variant: Four Player Chess? Dive into this chaotic and colorful variant today! / X

WE Games Four Player Chess Set, Chess Board for Team Chess, Combination Chess Game for Up to 4 Players, Unique Chess Sets for Adults and Kids, Roll Up