Rollerball was a science-fiction movie in the 70s about a futuristic sport where two teams were violently fighting around a ring.
 
The direction of play is mostly clockwise. Rooks and Bishops can rebound on the sides or the corners.
 
Victory is obtained by either checkmated the opposite King or bring your King on the starting square of the opponent King. Stalemate is a draw.

• Rook: slides any number of squares forward or sideways along the row or column. On the external ring, they have one rebound allowed on the corners of the board. Also, it can move 1 square orthogonally backward. The Rook is the strongest piece. They are 4 squares where the Rooks are very very strong: they can mate without assistance, watch out!
• Bishop: slides diagonally forward any number of squares with one rebound allowed on the sides of the board. Also, it can move 1 square diagonally backward.
• Pawn: moves and captures forward straight or diagonally. When reaching the starting square of opposite Pawns it promotes to either Rook or Bishop.
• King: can move to any adjacent square, but never to a square where it can be captured. When reaching the starting square of the opposite King, but only if turning clockwise, the King wins the game. The King have the royal privilege of beeing the only bi-directional piece.