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Daily Sudoku Answer 



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Dec 13 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R6C5 can only be <7>

R8C5 can only be <6>

R5C5 can only be <8>

R2C5 can only be <2>

R4C5 can only be <3>

R1C8 is the only square in row 1 that can be <3>

R6C4 is the only square in row 6 that can be <9>

R8C4 can only be <1>

R9C4 can only be <3>

R8C6 can only be <9>

R8C2 can only be <2>

R7C6 can only be <8>

R7C1 is the only square in row 7 that can be <3>

R2C6 is the only square in column 6 that can be <7>

Squares R4C1 and R8C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C1 - removing <47> from <2457> leaving <25>

R6C1 - removing <4> from <245> leaving <25>

Squares R5C1 and R6C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C1 - removing <25> from <2589> leaving <89>

R9C1 - removing <5> from <589> leaving <89>

Squares R1C3 and R3C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C3 - removing <25> from <124567> leaving <1467>

R9C3 - removing <5> from <56> leaving <6>

R9C7 can only be <9>

R9C1 can only be <8>

R2C7 can only be <6>

R2C4 can only be <5>

R2C8 can only be <8>

R9C2 can only be <5>

R3C1 can only be <9>

R6C2 can only be <1>

R2C9 can only be <9>

R5C4 can only be <4>

R1C6 can only be <4>

R3C2 can only be <8>

R3C4 can only be <6>

R4C6 can only be <1>

R4C2 can only be <6>

R7C2 can only be <9>

R5C3 can only be <7>

R5C6 can only be <5>

R8C3 can only be <4>

R4C1 can only be <4>

R5C1 can only be <2>

R8C1 can only be <7>

R7C3 can only be <1>

R4C8 can only be <7>

R4C9 can only be <8>

R5C7 can only be <1>

R6C1 can only be <5>

R5C9 can only be <6>

R1C7 can only be <2>

R1C3 can only be <5>

R7C7 can only be <4>

R3C8 can only be <4>

R3C7 can only be <7>

R3C9 can only be <5>

R6C8 can only be <2>

R3C3 can only be <2>

R1C9 can only be <1>

R6C9 can only be <4>

R7C8 can only be <6>

R7C9 can only be <2>



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