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Daily Sudoku Answer 



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Jul 18 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C4 can only be <6>

R9C4 can only be <9>

R2C1 is the only square in row 2 that can be <8>

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

R3C5 is the only square in row 3 that can be <8>

R3C4 is the only square in row 3 that can be <4>

R7C4 can only be <7>

R7C6 can only be <1>

R6C4 can only be <3>

R9C5 can only be <5>

R7C5 can only be <4>

R7C7 is the only square in row 7 that can be <8>

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

R4C6 is the only square in column 6 that can be <6>

Squares R2C7 and R9C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C7 - removing <12> from <1239> leaving <39>

R6C7 - removing <1> from <1479> leaving <479>

Squares R1C7 and R3C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C7 - removing <39> from <3479> leaving <47>

R6C7 - removing <9> from <479> leaving <47>

Squares R1C7 and R3C7 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R1C9 - removing <39> from <369> leaving <6>

R3C8 - removing <39> from <123569> leaving <1256>

R3C9 - removing <39> from <13569> leaving <156>

R7C8 is the only square in column 8 that can be <6>

R3C8 is the only square in column 8 that can be <2>

R2C7 can only be <1>

R2C2 can only be <2>

R9C7 can only be <2>

R3C9 can only be <5>

R9C1 can only be <6>

R9C3 can only be <1>

R3C1 can only be <3>

R6C1 can only be <9>

R8C3 can only be <3>

R3C7 can only be <9>

R1C3 can only be <7>

R3C6 can only be <7>

R1C7 can only be <3>

R7C1 can only be <2>

R5C2 can only be <3>

R7C3 can only be <5>

R1C6 can only be <9>

R3C3 can only be <6>

R3C2 can only be <1>

R4C2 can only be <5>

R7C2 can only be <9>

R6C3 can only be <4>

R6C2 can only be <6>

R6C7 can only be <7>

R4C3 can only be <2>

R6C5 can only be <1>

R4C7 can only be <4>

R7C9 can only be <3>

R4C9 can only be <9>

R4C5 can only be <7>

R4C8 can only be <3>

R8C9 can only be <1>

R5C8 can only be <1>

R5C5 can only be <9>

R6C8 can only be <5>

R8C8 can only be <9>



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