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Daily Sudoku Answer 



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May 17 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C6 is the only square in row 4 that can be <9>

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

R8C4 is the only square in row 8 that can be <8>

R8C6 is the only square in row 8 that can be <5>

R2C4 is the only square in row 2 that can be <5>

R3C7 is the only square in row 3 that can be <5>

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

R7C3 is the only square in row 7 that can be <5>

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

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

R6C4 is the only square in row 6 that can be <2>

R2C9 is the only square in column 9 that can be <7>

R2C1 is the only square in row 2 that can be <8>

R1C9 is the only square in column 9 that can be <8>

Squares R1C3 and R1C5 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C1 - removing <34> from <2346> leaving <26>

R1C7 - removing <4> from <246> leaving <26>

Squares R4C4 and R4C5 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C2 - removing <3> from <1346> leaving <146>

R4C3 - removing <37> from <13478> leaving <148>

R4C8 - removing <37> from <3467> leaving <46>

Intersection of row 8 with block 7. The value <1> only appears in one or more of squares R8C1, R8C2 and R8C3 of row 8. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R7C1 - removing <1> from <1347> leaving <347>

R9C1 - removing <1> from <1247> leaving <247>

R9C3 - removing <1> from <147> leaving <47>

R9C7 is the only square in row 9 that can be <1>

R9C1 is the only square in row 9 that can be <2>

R1C1 can only be <6>

R1C7 can only be <2>

R2C8 can only be <4>

R4C8 can only be <6>

R3C9 can only be <6>

R3C6 is the only square in row 3 that can be <2>

R2C6 can only be <1>

R2C2 can only be <2>

R7C6 can only be <4>

R3C4 can only be <3>

R4C4 can only be <7>

R1C5 can only be <4>

R4C5 can only be <3>

R7C4 can only be <1>

R7C7 can only be <6>

R7C9 can only be <3>

R9C5 can only be <7>

R7C1 can only be <7>

R8C9 can only be <4>

R8C8 can only be <2>

R9C3 can only be <4>

R1C3 can only be <3>

R5C1 can only be <3>

R3C3 can only be <1>

R3C1 can only be <4>

R4C3 can only be <8>

R4C7 can only be <4>

R6C3 can only be <7>

R4C2 can only be <1>

R6C7 can only be <8>

R5C2 can only be <6>

R5C8 can only be <7>

R8C1 can only be <1>

R6C2 can only be <4>

R6C8 can only be <3>

R8C2 can only be <3>



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