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Daily Sudoku Answer 



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Nov 30 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C8 can only be <8>

R5C6 can only be <1>

R5C4 can only be <3>

R7C6 can only be <4>

R8C5 can only be <7>

R8C1 can only be <1>

R7C4 can only be <1>

R7C3 can only be <3>

R2C8 is the only square in row 2 that can be <1>

R1C3 is the only square in row 1 that can be <1>

R2C1 is the only square in row 2 that can be <6>

R4C5 is the only square in row 4 that can be <5>

R5C5 can only be <2>

R5C2 can only be <5>

R4C4 is the only square in row 4 that can be <7>

R7C1 is the only square in row 7 that can be <5>

R8C8 is the only square in row 8 that can be <6>

R1C7 is the only square in row 1 that can be <6>

R9C7 is the only square in row 9 that can be <1>

R9C9 is the only square in row 9 that can be <3>

Squares R4C3 and R6C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C3 - removing <2> from <249> leaving <49>

R9C3 - removing <2> from <249> leaving <49>

Squares R9C3 and R9C8 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C2 - removing <49> from <2479> leaving <27>

Squares R4C7 and R6C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C7 - removing <29> from <2789> leaving <78>

Squares R1C8 and R3C3 form a remote naked pair. <49> can be removed from any square that is common to their groups.

R3C9 - removing <49> from <24789> leaving <278>

R1C2 - removing <49> from <249> leaving <2>

R1C1 can only be <8>

R9C2 can only be <7>

R9C1 can only be <2>

R2C2 can only be <4>

R3C1 can only be <7>

R2C5 can only be <8>

R8C2 can only be <9>

R3C3 can only be <9>

R2C9 can only be <7>

R6C5 can only be <4>

R3C6 can only be <6>

R7C9 can only be <8>

R3C7 can only be <8>

R9C3 can only be <4>

R3C4 can only be <4>

R4C6 can only be <9>

R3C9 can only be <2>

R7C7 can only be <7>

R4C7 can only be <2>

R6C6 can only be <8>

R4C3 can only be <6>

R6C7 can only be <9>

R6C4 can only be <6>

R8C9 can only be <4>

R1C9 can only be <9>

R9C8 can only be <9>

R1C8 can only be <4>

R6C3 can only be <2>



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