![ACOUTO Magnetic Sudoku, Not Easy To Lose Strong Adsorption Force Soft Magnetic Material Wooden Sudoku Board, Home Girls Kindergarten For Boys - Walmart.com ACOUTO Magnetic Sudoku, Not Easy To Lose Strong Adsorption Force Soft Magnetic Material Wooden Sudoku Board, Home Girls Kindergarten For Boys - Walmart.com](https://i5.walmartimages.com/asr/71948139-6a7d-481a-a377-9dd22d38a667.4790ee782a5e39fe3c38d1dae746edf0.jpeg)
ACOUTO Magnetic Sudoku, Not Easy To Lose Strong Adsorption Force Soft Magnetic Material Wooden Sudoku Board, Home Girls Kindergarten For Boys - Walmart.com
![By brute force, I can see that R2C9 must be a 4 and not 3. Can someone please explain why? : r/sudoku By brute force, I can see that R2C9 must be a 4 and not 3. Can someone please explain why? : r/sudoku](https://preview.redd.it/by-brute-force-i-can-see-that-r2c9-must-be-a-4-and-not-3-v0-kvv8amkk4ska1.jpg?auto=webp&s=a98e21451bfb181391053a535b2e20455c6c3544)
By brute force, I can see that R2C9 must be a 4 and not 3. Can someone please explain why? : r/sudoku
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