Each player owns a
castle consisting of 3×3 squares surrounded by a
wall of 12 squares. A king may not leave its 3×3 castle, but the other pieces are free to move unimpeded by castles or walls. • The king can move and capture like a
chess king or a chess
knight. It can only capture pieces inside the 3×3 castle and cannot capture pieces on the wall. • A rook moves like a rook in chess, and is unimpeded by castles or walls. If its move ends on a square in the enemy castle, it automatically
promotes to a queen. • A queen moves like a queen in chess and is unimpeded by castles or walls. • Captures are limited: a capture can happen between a rook or queen and an enemy rook or queen only when one of the pieces is on the opponent's wall and the other piece is in its castle. • In other situations, rooks and queens cannot capture and simply block one another's movement. Only a king can capture an enemy piece inside its castle. • A king is in
check whenever it is in the path of an enemy rook or queen. Castle walls do not block checks. As regular in chess,
White moves first, a capturing piece replaces the piece captured, and
checkmate wins the game. ==References==