Chess variant played on a round board. The board layout is very similar to a normal chessboard. Most pieces move in the same way as in chess, but the rook and the queen move along the circular shape of the board.
The rook can move along either the concentric circles round and round, or the straight lines orthogonal to the circles. These straight lines begin at the edge of the board and bent squarely at the innermost circle. Null-moves that do not change the position are not allowed: the rook cannot make a full round to move back to its starting field.
The queen combines the power of the rook and the bishop.
Other pieces move in the same way as in standard chess.
Otherwise the rules of chess apply.