Witch game is based on Amazon chess where the Amazon is also a witch.
For main Amazon rules, please see Amazon Chess rules.
Witches features :
Here the pawn can move from f2 to f4 because the white Witch is transparent for White.
Here the bishop can move from c1 to e3, f4, g5 or h6 because the d2 white pawn is transparent because it is adjacent to white Witch.
This variant is proposed by Zied Haddad, the witch is an idea from @evert832