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Daily Sudoku Answer 



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Jan 18 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C6 can only be <4>

R2C6 can only be <1>

R4C6 can only be <9>

R8C6 can only be <5>

R6C6 can only be <8>

R2C8 is the only square in row 2 that can be <8>

R7C2 is the only square in row 7 that can be <9>

R3C5 is the only square in row 3 that can be <9>

R1C3 is the only square in row 1 that can be <9>

R3C9 is the only square in row 3 that can be <5>

R1C5 is the only square in row 1 that can be <5>

R6C4 is the only square in row 6 that can be <5>

R8C7 is the only square in row 8 that can be <9>

R9C3 is the only square in row 9 that can be <5>

R1C2 is the only square in column 2 that can be <1>

R2C2 is the only square in column 2 that can be <2>

R5C3 is the only square in column 3 that can be <2>

Squares R2C4 and R2C5 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C7 - removing <4> from <467> leaving <67>

Squares R4C1 and R4C4 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C5 - removing <16> from <1267> leaving <27>

R4C9 - removing <6> from <267> leaving <27>

Squares R4C1 and R6C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C1 - removing <6> from <346> leaving <34>

R7C1 - removing <6> from <3468> leaving <348>

R9C1 - removing <6> from <4678> leaving <478>

R2C3 is the only square in block 1 that can be <6>

R2C7 can only be <7>

R8C3 can only be <7>

R5C7 can only be <6>

R3C8 can only be <3>

R3C2 can only be <4>

R7C8 can only be <6>

R5C4 can only be <3>

R6C9 can only be <2>

R4C9 can only be <7>

R1C8 can only be <2>

R8C8 can only be <1>

R1C7 can only be <4>

R9C8 can only be <7>

R3C1 can only be <7>

R9C2 can only be <6>

R1C1 can only be <3>

R4C5 can only be <2>

R9C9 can only be <4>

R5C5 can only be <7>

R2C4 can only be <4>

R8C2 can only be <3>

R9C1 can only be <8>

R9C7 can only be <2>

R1C9 can only be <6>

R7C9 can only be <3>

R2C5 can only be <3>

R8C4 can only be <6>

R8C5 can only be <4>

R4C4 can only be <1>

R7C5 can only be <8>

R9C5 can only be <1>

R7C1 can only be <4>

R6C5 can only be <6>

R4C1 can only be <6>

R6C1 can only be <1>



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