'chess960' (Chess960, also known as Fischer Random Chess).
'no-king' (chess position without any king)
'white-king-only' (chess position with no black king)
'black-king-only' (chess position with no white king)
'antichess' (Antichess, also known as losing chess, giveaway chess, suicide chess...)
'horde' (Horde chess, following Lichess/Chess.com rules)
Variants 'no-king', 'white-king-only' and 'black-king-only' do not correspond to "real" games. They are mainly provided
to create games explaining a particular piece scheme, concept, or sequence of moves... with a reduced number of pieces.
Variant of the chess game rules.
'regular'(regular chess rules),'chess960'(Chess960, also known as Fischer Random Chess).'no-king'(chess position without any king)'white-king-only'(chess position with no black king)'black-king-only'(chess position with no white king)'antichess'(Antichess, also known as losing chess, giveaway chess, suicide chess...)'horde'(Horde chess, following Lichess/Chess.com rules)Variants
'no-king','white-king-only'and'black-king-only'do not correspond to "real" games. They are mainly provided to create games explaining a particular piece scheme, concept, or sequence of moves... with a reduced number of pieces.