+https://www.chessvariants.com/diffmove.dir/balaklava.html
+
+Rampage Chess: Any Unit May move to any empty square that is guarded. A King cannot make a special move to get out of check.
+
+Swap chess: Friendly pieces may swap places
+
+https://www.chessvariants.com/crossover.dir/koopachess.html
+--> Can a stunned piece capture? Maybe not. ...recover? After 5 moves? Never?
+