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Daily Sudoku Answer 



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Aug 12 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



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

R7C5 is the only square in row 7 that can be <8>

R8C6 is the only square in row 8 that can be <5>

R9C9 is the only square in row 9 that can be <4>

R9C1 is the only square in column 1 that can be <1>

R9C2 is the only square in row 9 that can be <3>

R7C1 can only be <5>

R7C3 can only be <9>

R3C3 can only be <6>

R2C3 can only be <3>

R6C1 is the only square in column 1 that can be <3>

R6C2 is the only square in row 6 that can be <8>

R3C2 can only be <9>

R3C1 is the only square in row 3 that can be <8>

R8C4 is the only square in block 8 that can be <7>

Squares R2C4 and R9C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C4 - removing <9> from <239> leaving <23>

R5C4 - removing <6> from <236> leaving <23>

Squares R4C4 and R5C4 in block 5 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 block.

R4C5 - removing <2> from <24579> leaving <4579>

R5C5 - removing <2> from <267> leaving <67>

R6C5 - removing <2> from <24579> leaving <4579>

Squares R5C5 and R5C6 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C2 - removing <7> from <17> leaving <1>

R4C2 can only be <7>

R4C8 is the only square in column 8 that can be <1>

R7C9 is the only square in column 9 that can be <7>

R6C7 is the only square in column 7 that can be <7>

Squares R5C8 and R7C8 in column 8 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 column.

R1C8 - removing <23> from <2349> leaving <49>

R6C8 - removing <2> from <249> leaving <49>

R1C9 is the only square in row 1 that can be <3>

R1C5 is the only square in row 1 that can be <2>

R3C5 can only be <4>

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

R2C7 can only be <9>

R6C8 can only be <9>

R6C5 can only be <5>

R6C6 can only be <4>

R1C8 can only be <4>

R4C9 can only be <2>

R1C1 can only be <7>

R2C4 can only be <6>

R8C7 can only be <1>

R4C3 can only be <5>

R4C4 can only be <3>

R3C9 can only be <1>

R5C8 can only be <3>

R5C4 can only be <2>

R7C8 can only be <2>

R6C3 can only be <2>

R4C5 can only be <9>

R7C7 can only be <3>

R8C9 can only be <9>

R3C7 can only be <2>

R1C6 can only be <9>

R2C1 can only be <4>

R2C6 can only be <7>

R9C4 can only be <9>

R5C6 can only be <6>

R9C5 can only be <6>

R5C5 can only be <7>



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