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Daily Sudoku Answer 


The full reasoning can be found below the Sudoku.

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Sep 06 - Hard
Puzzle Copyright © Kevin Stone


Reasoning 


R5C7 is the only square in row 5 that can be <4>

R1C3 is the only square in row 1 that can be <4>

R3C9 is the only square in row 3 that can be <4>

R7C6 is the only square in column 6 that can be <9>

R9C6 is the only square in column 6 that can be <5>

R9C2 can only be <7>

R2C9 is the only square in column 9 that can be <1>

R7C5 is the only square in column 5 that can be <1>

R9C3 is the only square in row 9 that can be <1>

R7C3 is the only square in column 3 that can be <2>

Squares R2C5 and R2C8 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C1 - removing <3> from <356> leaving <56>

R2C2 - removing <3> from <356> leaving <56>

R1C2 is the only square in column 2 that can be <3>

Squares R1C7 and R1C8 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C4 - removing <8> from <178> leaving <17>

Squares R2C1 and R7C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C1 - removing <6> from <679> leaving <79>

R4C1 - removing <56> from <356789> leaving <3789>

R6C1 - removing <56> from <3568> leaving <38>

R8C1 - removing <56> from <569> leaving <9>

R3C1 can only be <7>

R5C2 is the only square in column 2 that can be <9>

R4C7 is the only square in row 4 that can be <9>

R1C7 can only be <8>

R1C8 can only be <9>

R3C3 is the only square in row 3 that can be <9>

R9C8 is the only square in row 9 that can be <8>

R5C8 can only be <6>

R5C3 can only be <7>

R8C8 can only be <2>

R8C5 can only be <7>

R2C8 can only be <3>

R9C7 can only be <3>

R9C4 can only be <2>

R3C7 can only be <2>

R2C5 can only be <2>

R6C7 can only be <5>

R5C5 can only be <8>

R3C5 can only be <3>

R6C3 can only be <6>

R7C7 can only be <6>

R4C9 can only be <8>

R7C1 can only be <5>

R8C9 can only be <5>

R7C4 can only be <3>

R8C2 can only be <6>

R7C9 can only be <7>

R3C6 can only be <6>

R3C4 can only be <8>

R4C1 can only be <3>

R6C9 can only be <2>

R4C3 can only be <5>

R2C1 can only be <6>

R6C4 can only be <1>

R2C2 can only be <5>

R4C6 can only be <7>

R6C1 can only be <8>

R4C4 can only be <6>

R1C6 can only be <1>

R6C6 can only be <3>

R1C4 can only be <7>


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