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greater range - with two rooks or a queen and rook unobstructed on the same ring being especially powerful - while those of the bishop and knight are diminished; for example, on an 8×8 board two minor pieces are held to be stronger than one rook, but on a circular board the rook is considerably stronger. This can be easily seen by just counting the number of squares an unobstructed piece is able to attack on an orthodox and a circular board: the queen, rook, bishop, and knight can attack 27, 14, 13, and 8 squares respectively on an orthodox

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