file leftmost to the White player (a in algebraic notation and QR in descriptive notation) is file one and the rightmost to them (h in algebraic notation and KR in descriptive notation) is file eight.

Variant boards

Variant chessboard shapes and sizes go back to the Persian origins of the game in the 10th century, when the book Muraj adh-dhahab (Board of the Gods) described six different variants of chess, including circular and cylinder chess.

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