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Daily Sudoku Answer 



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Oct 09 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R3C7 is the only square in row 3 that can be <1>

R4C9 is the only square in row 4 that can be <6>

R4C7 is the only square in row 4 that can be <8>

R8C7 can only be <9>

R8C9 can only be <4>

R4C1 is the only square in row 4 that can be <5>

R5C2 is the only square in row 5 that can be <1>

R6C7 is the only square in row 6 that can be <5>

R7C7 is the only square in row 7 that can be <7>

R2C7 can only be <2>

R8C3 is the only square in row 8 that can be <1>

R9C4 is the only square in row 9 that can be <1>

R5C8 is the only square in column 8 that can be <3>

R2C9 is the only square in column 9 that can be <7>

Squares R2C1 and R8C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R6C1 - removing <3> from <237> leaving <27>

Squares R5C1 and R6C1 in block 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R4C3 - removing <2> from <234> leaving <34>

R6C3 - removing <2> from <234> leaving <34>

R4C6 is the only square in row 4 that can be <2>

R1C5 is the only square in column 5 that can be <2>

R5C5 is the only square in column 5 that can be <7>

R5C1 can only be <2>

R5C9 can only be <9>

R6C1 can only be <7>

R6C9 can only be <2>

Squares R3C6 and R3C8 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C3 - removing <9> from <269> leaving <26>

R3C4 - removing <9> from <679> leaving <67>

R2C3 is the only square in column 3 that can be <9>

R9C5 is the only square in column 5 that can be <9>

R9C6 can only be <8>

R9C2 can only be <2>

R9C8 can only be <6>

R3C2 can only be <7>

R7C3 can only be <6>

R8C8 can only be <8>

R3C4 can only be <6>

R3C3 can only be <2>

R7C4 can only be <4>

R2C5 can only be <5>

R8C1 can only be <3>

R7C6 can only be <5>

R4C4 can only be <3>

R7C2 can only be <8>

R3C6 can only be <9>

R8C5 can only be <6>

R2C1 can only be <6>

R8C2 can only be <5>

R7C8 can only be <2>

R2C8 can only be <4>

R2C2 can only be <3>

R1C8 can only be <9>

R3C8 can only be <5>

R1C6 can only be <3>

R4C3 can only be <4>

R1C4 can only be <7>

R6C4 can only be <9>

R6C6 can only be <4>

R6C3 can only be <3>

R1C2 can only be <4>



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