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Daily Sudoku Answer 



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Aug 11 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C7 is the only square in row 2 that can be <6>

R7C5 is the only square in row 7 that can be <4>

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

R8C3 is the only square in row 8 that can be <2>

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

R1C7 is the only square in column 7 that can be <4>

Squares R1C8 and R1C9 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C2 - removing <17> from <1278> leaving <28>

R1C4 - removing <1> from <1258> leaving <258>

R1C6 - removing <1> from <158> leaving <58>

Squares R4C1 and R5C1 in column 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 column.

R2C1 - removing <4> from <345> leaving <35>

R3C1 - removing <4> from <48> leaving <8>

R3C5 can only be <2>

R1C2 can only be <2>

R3C2 can only be <1>

R3C3 can only be <4>

R2C2 can only be <7>

R6C2 can only be <9>

R9C2 can only be <8>

R5C4 is the only square in row 5 that can be <2>

Squares R2C1 and R2C3 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C4 - removing <5> from <1459> leaving <149>

R2C5 - removing <5> from <59> leaving <9>

R2C6 - removing <5> from <1459> leaving <149>

R5C6 is the only square in row 5 that can be <9>

R5C9 is the only square in row 5 that can be <3>

R5C1 is the only square in row 5 that can be <4>

R4C1 can only be <6>

R5C5 is the only square in row 5 that can be <6>

R6C6 is the only square in row 6 that can be <3>

R6C9 is the only square in row 6 that can be <6>

R8C8 is the only square in row 8 that can be <3>

R8C6 is the only square in row 8 that can be <6>

R9C6 can only be <5>

R9C1 can only be <3>

R1C6 can only be <8>

R1C4 can only be <5>

R9C3 can only be <9>

R2C1 can only be <5>

R9C4 can only be <7>

R7C3 can only be <5>

R9C8 can only be <6>

R8C5 can only be <8>

R6C4 can only be <1>

R2C3 can only be <3>

R2C4 can only be <4>

R4C6 can only be <4>

R7C8 can only be <1>

R7C9 can only be <9>

R1C8 can only be <7>

R8C9 can only be <7>

R8C4 can only be <9>

R8C7 can only be <5>

R1C9 can only be <1>

R4C8 can only be <5>

R2C6 can only be <1>

R4C4 can only be <8>

R4C5 can only be <7>

R6C7 can only be <7>

R6C5 can only be <5>

R5C7 can only be <1>

R4C3 can only be <1>

R5C3 can only be <7>



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