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Daily Sudoku Answer 



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Sep 13 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C5 can only be <6>

R8C8 can only be <8>

R2C8 can only be <5>

R7C8 can only be <7>

R1C9 is the only square in row 1 that can be <2>

R3C1 is the only square in row 3 that can be <7>

R4C6 is the only square in row 4 that can be <2>

R6C9 is the only square in row 6 that can be <8>

R6C1 is the only square in row 6 that can be <9>

R7C1 is the only square in row 7 that can be <2>

R7C4 is the only square in row 7 that can be <8>

R9C3 is the only square in row 9 that can be <7>

Intersection of row 8 with block 7. The value <3> 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.

R9C1 - removing <3> from <348> leaving <48>

R9C2 - removing <3> from <3489> leaving <489>

Intersection of column 7 with block 6. The values <67> only appears in one or more of squares R4C7, R5C7 and R6C7 of column 7. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain these values.

R4C9 - removing <6> from <3456> leaving <345>

R5C9 - removing <6> from <3456> leaving <345>

Squares R4C9<345>, R5C9<345> and R6C8<34> in block 6 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <345>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R4C7 - removing <5> from <567> leaving <67>

R5C7 - removing <5> from <567> leaving <67>

R9C7 is the only square in column 7 that can be <5>

R9C4 can only be <3>

R7C9 can only be <6>

R7C3 can only be <4>

R8C9 can only be <9>

R9C9 can only be <1>

R9C5 can only be <4>

R9C1 can only be <8>

R7C6 can only be <5>

R9C2 can only be <9>

R1C7 is the only square in row 1 that can be <8>

R2C7 can only be <1>

R2C1 can only be <6>

R3C7 can only be <9>

R3C6 can only be <1>

R2C2 can only be <8>

R3C4 can only be <5>

R1C6 can only be <9>

R6C6 can only be <4>

R6C8 can only be <3>

R6C5 can only be <5>

R1C8 can only be <4>

R3C9 can only be <3>

R3C2 can only be <4>

R4C9 is the only square in row 4 that can be <5>

R5C9 can only be <4>

R5C1 can only be <3>

R5C5 can only be <7>

R1C1 can only be <1>

R4C2 can only be <6>

R5C7 can only be <6>

R4C5 can only be <3>

R5C3 can only be <5>

R4C7 can only be <7>

R1C3 can only be <3>

R4C1 can only be <4>

R8C3 can only be <6>

R4C4 can only be <1>

R8C2 can only be <3>

R6C3 can only be <1>

R6C4 can only be <6>



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