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Daily Sudoku Answer 



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May 10 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R7C3 can only be <1>

R2C4 is the only square in column 4 that can be <4>

R8C6 is the only square in column 6 that can be <3>

R9C9 is the only square in column 9 that can be <1>

R8C9 is the only square in column 9 that can be <2>

R7C6 is the only square in block 8 that can be <8>

Squares R5C8 and R7C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R6C8 - removing <9> from <3489> leaving <348>

R9C8 - removing <9> from <3479> leaving <347>

Squares R5C9 and R7C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C9 - removing <56> from <3568> leaving <38>

R5C9 is the only square in block 6 that can be <6>

R7C9 can only be <5>

R7C8 can only be <9>

R7C7 can only be <6>

R5C8 can only be <5>

R6C7 is the only square in column 7 that can be <9>

R6C8 is the only square in block 6 that can be <4>

Intersection of row 5 with block 4. The value <1> only appears in one or more of squares R5C1, R5C2 and R5C3 of row 5. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R6C1 - removing <1> from <123> leaving <23>

Intersection of row 6 with block 5. The values <17> only appears in one or more of squares R6C4, R6C5 and R6C6 of row 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.

R4C4 - removing <7> from <5679> leaving <569>

R4C6 - removing <7> from <67> leaving <6>

R6C6 is the only square in column 6 that can be <7>

R6C4 can only be <1>

R3C4 can only be <5>

R4C4 can only be <9>

R5C5 can only be <2>

R5C1 can only be <1>

R1C5 can only be <6>

R6C5 can only be <8>

R6C9 can only be <3>

R4C5 can only be <5>

R6C1 can only be <2>

R4C9 can only be <8>

R9C5 can only be <9>

R5C2 can only be <9>

R2C1 can only be <6>

R3C1 can only be <3>

R3C3 can only be <2>

R4C1 can only be <4>

R3C7 can only be <8>

R2C3 can only be <9>

R9C3 can only be <4>

R3C2 can only be <1>

R8C7 can only be <4>

R2C8 can only be <1>

R4C2 can only be <7>

R1C1 can only be <5>

R4C3 can only be <3>

R8C2 can only be <6>

R9C7 can only be <3>

R1C3 can only be <7>

R9C8 can only be <7>

R1C7 can only be <2>

R9C4 can only be <6>

R8C8 can only be <8>

R1C6 can only be <1>

R2C2 can only be <8>

R2C6 can only be <2>

R1C8 can only be <3>

R1C2 can only be <4>

R8C4 can only be <7>

R9C2 can only be <2>



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