Zillions
Jacks and Witches 84
. Variant on 84 squares with special pieces and special squares. By Antoine Fourrière.
Jai-Alai
. A sports theme variant with three new pieces: the Superball, the Ball and the Diagball. By Roberto Lavieri.
Javelin Chess
. Pieces backed up by an extra row of single-capture Spearmen. By Adrian Alvarez de la Campa.
Jetan
. Martian Chess, coming from the book The Chessmen of Mars. Author: Jens Markmann. Inventor: Edgar Rice Burroughs.
Jetan, ERB
. Implements different possible rules for Jetan. Author: Larry L. Smith. Inventor: Edgar Rice Burroughs.
Joko Urtaroak
. Modern large version of Game of Four Seasons; four player chess variant. By Glenn Overby II.
Joshua's Chess
. Missing description Author: Michael Nelson. Inventor: Joshua Nelson.
Joust
. Two knights. Squares cannot be revisited. Author: Gerry Quinn.
Jumping Chess
. Pieces capture by jumping. Board has extra edge squares making it 10x10. By Peter Aronson.
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