('Checkered', 'Shared pieces'),
('Chess960', 'Standard rules'),
('Circular', 'Run forward'),
+ ('Coregal', 'Two royal pieces'),
('Crazyhouse', 'Captures reborn'),
('Cylinder', 'Neverending rows'),
('Dark', 'In the shadow'),
('Suicide', 'Lose all pieces'),
('Suction', 'Attract opposite king'),
('Threechecks', 'Give three checks'),
+ ('Twokings', 'Two kings'),
('Upsidedown', 'Board upside down'),
('Wildebeest', 'Balanced sliders & leapers'),
('Wormhole', 'Squares disappear'),