https://www.chessvariants.com/crossover.dir/koopachess.html
--> Can a stunned piece capture? Maybe not. ...recover? After 5 moves? Never?
-Diamond Chess [Rynd] (J. A.
-Porterfield Rynd, 1886) --> Berolina2 ?
-https://www.chessvariants.com/rules/diamond-chess
-
Bicolour Chess (Gabriel Authier, 1958). v1 et v2 : (Roméo Bédoni, 1958)
Kings are subject to check and checkmate by
own as well as opponent’s pieces. The Q and
v2: y but a player may capture his
own men (TODO: only v2?)
-Koth : king of the hill, king cannot move into check, giving check is forbidden (no checkmate).
-
Berolina Grid Chess, also known as
Gridolina (originator not noted). A
combination of Berolina and Grid Chess.