Normal 8×8 sudoku rules apply. Each circled cell represents a chess piece on the corresponding square of a chessboard, with White moving up the board. Each piece type and colour is assigned a unique digit (eg all white pawns share one digit and all black pawns another), and not all piece types must appear. All white pieces are globally lower digits than all black pieces ((i.e. the highest white piece is lower than the lowest black piece), and within each colour the digit values follow standard chess hierarchy if they exist: Pawn is less than Knight is less than Bishop is less than Rook is less than Queen is less than King. The chess position is legal, no piece is currently attacking any piece of the opposite colour, regardless of it is defended, and White and Black have identical material (the same number of each piece type). No pawn promotions have occurred. It is White to move, and White has a checkmate in one. Digits separated by a white dot are consecutive.
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