Sissa is a 9x9 chess variant invented in 1998 by Carlos Cetina, using his Bishops Conversion Rule. I do not recall anyone else including his rule in a chess variant. In Caïssa Britannia (Fergus Duniho) the Bishop may also step one space orthogonally without capturing - any Bishop, any number of times.
Sissa is a 9x9 chess variant invented in 1998 by Carlos Cetina, using his Bishops Conversion Rule. I do not recall anyone else including his rule in a chess variant. In Caïssa Britannia (Fergus Duniho) the Bishop may also step one space orthogonally without capturing - any Bishop, any number of times.