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Daily Sudoku Answer 



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Aug 03 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C7 can only be <5>

R8C9 can only be <1>

R5C3 can only be <2>

R5C5 can only be <1>

R1C4 is the only square in row 1 that can be <1>

R2C2 is the only square in row 2 that can be <3>

R3C3 is the only square in row 3 that can be <4>

R7C3 can only be <6>

R9C3 can only be <5>

R8C2 can only be <2>

R6C8 is the only square in row 6 that can be <1>

R7C6 is the only square in row 7 that can be <1>

R9C2 is the only square in row 9 that can be <1>

R4C2 is the only square in column 2 that can be <8>

Squares R8C7 and R8C8 in row 8 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.

R8C4 - removing <4> from <456> leaving <56>

Squares R8C7 and R8C8 in block 9 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 block.

R7C7 - removing <4> from <2347> leaving <237>

R7C8 - removing <4> from <2478> leaving <278>

R9C8 - removing <4> from <478> leaving <78>

R9C1 is the only square in row 9 that can be <4>

R7C1 can only be <8>

Intersection of row 4 with block 6. The value <7> only appears in one or more of squares R4C7, R4C8 and R4C9 of row 4. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.

R6C9 - removing <7> from <37> leaving <3>

R9C6 is the only square in row 9 that can be <3>

R7C4 can only be <4>

R7C5 can only be <7>

R7C8 can only be <2>

R7C7 can only be <3>

R4C4 is the only square in row 4 that can be <3>

R4C6 is the only square in row 4 that can be <6>

R8C6 can only be <5>

R8C4 can only be <6>

R4C1 is the only square in row 4 that can be <9>

R6C3 can only be <7>

R6C2 can only be <5>

R2C3 can only be <9>

R6C4 can only be <9>

R6C6 can only be <2>

R6C5 can only be <4>

R2C6 can only be <7>

R3C6 can only be <9>

R4C5 can only be <5>

R3C5 can only be <2>

R3C7 can only be <7>

R3C2 can only be <6>

R4C7 can only be <4>

R1C9 can only be <6>

R4C8 can only be <7>

R8C7 can only be <9>

R9C8 can only be <8>

R8C8 can only be <4>

R1C7 can only be <2>

R9C9 can only be <7>

R2C8 can only be <5>

R1C1 can only be <5>

R1C2 can only be <7>

R3C9 can only be <8>

R2C1 can only be <2>

R2C4 can only be <8>

R1C8 can only be <9>

R3C4 can only be <5>



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