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Daily Sudoku Answer 



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Jul 24 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C4 is the only square in row 2 that can be <1>

R2C6 is the only square in row 2 that can be <9>

R3C5 is the only square in row 3 that can be <5>

R3C8 is the only square in row 3 that can be <7>

R7C9 is the only square in row 7 that can be <1>

R7C5 is the only square in row 7 that can be <9>

R1C5 is the only square in block 2 that can be <4>

R1C8 can only be <8>

R1C6 is the only square in row 1 that can be <2>

R3C6 can only be <3>

R3C3 can only be <2>

R5C6 can only be <8>

R9C4 is the only square in row 9 that can be <4>

R6C9 is the only square in column 9 that can be <8>

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

Squares R9C2 and R9C5 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C1 - removing <36> from <3568> leaving <58>

R9C3 - removing <3> from <358> leaving <58>

Intersection of row 6 with block 4. The value <5> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R4C1 - removing <5> from <2359> leaving <239>

R4C3 - removing <5> from <357> leaving <37>

R5C1 - removing <5> from <23459> leaving <2349>

Intersection of row 7 with block 7. The value <6> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R8C2 - removing <6> from <2367> leaving <237>

R9C2 - removing <6> from <36> leaving <3>

R9C5 can only be <6>

R8C6 can only be <7>

R8C2 can only be <2>

R6C6 can only be <6>

R7C4 can only be <2>

R7C1 can only be <6>

R8C4 can only be <3>

R5C4 can only be <5>

R4C4 can only be <7>

R7C2 can only be <7>

R3C1 can only be <4>

R3C9 can only be <6>

R2C2 can only be <6>

R2C8 can only be <4>

R4C3 can only be <3>

R5C8 can only be <1>

R2C3 can only be <8>

R6C1 can only be <5>

R5C2 can only be <4>

R6C3 can only be <7>

R9C1 can only be <8>

R9C3 can only be <5>

R2C1 can only be <3>

R6C2 can only be <1>

R6C5 can only be <3>

R6C7 can only be <4>

R5C5 can only be <2>

R8C7 can only be <6>

R8C8 can only be <5>

R4C7 can only be <9>

R8C9 can only be <4>

R4C8 can only be <6>

R4C1 can only be <2>

R4C9 can only be <5>

R1C7 can only be <3>

R5C9 can only be <3>

R5C1 can only be <9>

R4C5 can only be <1>

R1C9 can only be <9>



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