AnarchyChess

Regular Chess rules +

Knook is a combination of a knight and a rook. 

"Il Vaticano" can be played when two enemy pawns are positioned between two bishops. After the move, the bishops switch places and the enemy pawns are removed from the board.

 if you have the opportunity to perform en passant but choose not to, your PIPI will become immobilized or "bricked."

With "Siberian Swipe," your rook can leap over any number of pieces and capture an enemy rook if neither your rook nor your rook's pawn has moved.

When utilizing "Knight Roost," your knight can capture a Siberian Swipe-enabled rook by jumping into its path, provided your knight hasn't moved.

For "Vertical Castling," after promoting a pawn to a rook on the same file as the king, and if the king hasn't moved, you can perform vertical castling. You can also perform a chained castling move.

After a pawn is promoted, it can randomly transform into a queen, king, bishop, knight, rook, or knook. There's also a 20% chance that the pawn will be promoted into an enemy pawn.

If a pawn is promoted to king it will be a fake king and can't be in check.

a white pawn on the c-file and a black pawn on the f-file explode upon being captured. This rule excludes special moves like en passant.

a piece that lands on the boost square advances 1 square in the boost direction.

The "Impostor Pawn" moves diagonally and captures vertically.