4PC Variants List - Chess Forums
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New variants using common pieces amongst them. - Chess Forums

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Apocalypse (chess variant) - Wikipedia

Variants supported by XBoard

New variants using common pieces amongst them. - Chess Forums

Tips for playing the chess variant: Fischer Random / Chess960

Updates to 4 Player Chess - Chess Forums

Chess Bot - Variants (Chess960, Crazyhouse, Horde, etc)

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HIARCS Chess Explorer, PDF, Chess Openings
Quatrochess - Wikipedia

New variants using common pieces amongst them. - Chess Forums

4PC Variant]: Custom Starting Position - Chess Forums
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