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definitions and information are taken from Rohan Rao blog & Sudopedia

Rules:
Place numbers in the grid such that every row, column and 3x3 box contain the numbers 1 to 9. The number 9 in the grid is a chess Queen. Two Queens cannot be placed along the same row, column or diagonal of any length.

Inserire i numeri in modo che ogni riga, colonna, settore contenga i numeri da 1 a 9. Il numero 9 nella griglia si compota come la regina negli scacchi. 2 regine non possono stare nella stessa riga, colonna o diagonale di qualsiasi lunghezza.


Solution