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Daily Sudoku Answer 



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Jul 29 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R3C6 can only be <5>

R7C8 can only be <6>

R9C4 can only be <5>

R9C1 can only be <6>

R9C7 can only be <2>

R9C5 can only be <8>

R7C9 can only be <7>

R7C7 can only be <5>

R2C7 is the only square in row 2 that can be <7>

R3C8 is the only square in row 3 that can be <9>

R6C5 is the only square in row 6 that can be <5>

R7C5 is the only square in row 7 that can be <2>

Squares R7C4 and R8C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C4 - removing <13> from <1349> leaving <49>

R5C4 - removing <3> from <3469> leaving <469>

R6C4 - removing <13> from <1346> leaving <46>

Squares R1C6 and R2C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C6 - removing <13> from <12378> leaving <278>

R5C6 - removing <3> from <2378> leaving <278>

R6C6 - removing <13> from <1238> leaving <28>

R4C5 is the only square in block 5 that can be <1>

R5C5 is the only square in block 5 that can be <3>

Squares R1C5 and R1C9 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C3 - removing <6> from <136> leaving <13>

Squares R3C1 and R5C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C1 - removing <4> from <1345> leaving <135>

R4C1 - removing <24> from <234> leaving <3>

R6C7 is the only square in row 6 that can be <3>

R5C7 is the only square in column 7 that can be <6>

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

Squares R4C4 and R4C7 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C8 - removing <4> from <48> leaving <8>

R8C8 can only be <4>

R8C7 can only be <9>

R8C9 can only be <8>

R4C7 can only be <4>

R4C4 can only be <9>

R6C9 can only be <2>

R6C6 can only be <8>

R5C9 can only be <9>

R5C4 can only be <4>

R5C1 can only be <2>

R6C3 can only be <1>

R5C6 can only be <7>

R3C1 can only be <4>

R4C3 can only be <7>

R5C3 can only be <8>

R4C6 can only be <2>

R6C2 can only be <4>

R1C3 can only be <3>

R1C6 can only be <1>

R8C3 can only be <5>

R2C6 can only be <3>

R3C2 can only be <8>

R3C5 can only be <6>

R2C2 can only be <1>

R3C3 can only be <2>

R1C5 can only be <4>

R8C1 can only be <1>

R2C3 can only be <6>

R1C9 can only be <6>

R2C9 can only be <4>

R2C1 can only be <5>

R7C2 can only be <3>

R7C4 can only be <1>

R8C4 can only be <3>



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