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Daily Sudoku Answer 



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Sep 25 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C7 can only be <2>

R4C4 is the only square in row 4 that can be <1>

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

R3C7 can only be <7>

R9C8 is the only square in row 9 that can be <5>

R9C6 is the only square in row 9 that can be <2>

R8C4 is the only square in column 4 that can be <3>

R6C4 is the only square in column 4 that can be <7>

R6C3 can only be <6>

R6C6 can only be <5>

R4C3 can only be <8>

R6C7 can only be <3>

R5C7 can only be <5>

R5C9 can only be <6>

R4C6 can only be <6>

R5C3 can only be <7>

R5C1 can only be <3>

R1C6 can only be <9>

R5C5 can only be <8>

R8C9 can only be <2>

R7C9 can only be <3>

Intersection of column 4 with block 2. The value <6> only appears in one or more of squares R1C4, R2C4 and R3C4 of column 4. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R1C5 - removing <6> from <146> leaving <14>

R3C5 - removing <6> from <156> leaving <15>

Squares R1C3<12>, R2C1<18> and R3C1<128> in block 1 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <128>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C2 - removing <8> from <358> leaving <35>

R3C2 - removing <8> from <568> leaving <56>

Intersection of column 2 with block 7. The values <78> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.

R7C1 - removing <8> from <1248> leaving <124>

R8C1 - removing <8> from <89> leaving <9>

R6C1 can only be <4>

R6C8 can only be <9>

R4C2 can only be <9>

R3C8 can only be <2>

R4C9 can only be <4>

R2C9 can only be <1>

R2C1 can only be <8>

R3C9 can only be <9>

R2C6 can only be <7>

R3C1 can only be <1>

R7C6 can only be <8>

R3C5 can only be <5>

R7C1 can only be <2>

R1C3 can only be <2>

R3C2 can only be <6>

R2C5 can only be <4>

R7C3 can only be <1>

R7C8 can only be <6>

R9C4 can only be <4>

R8C8 can only be <8>

R8C2 can only be <7>

R9C2 can only be <8>

R9C5 can only be <9>

R1C4 can only be <6>

R7C5 can only be <7>

R1C2 can only be <3>

R3C4 can only be <8>

R2C8 can only be <3>

R1C5 can only be <1>

R2C2 can only be <5>

R1C8 can only be <4>

R7C2 can only be <4>

R8C5 can only be <6>



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