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Daily Sudoku Answer 



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Apr 13 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C6 can only be <8>

R4C1 can only be <3>

R1C6 can only be <4>

R1C4 can only be <2>

R9C6 can only be <6>

R6C6 can only be <1>

R1C5 can only be <8>

R2C5 can only be <6>

R5C6 can only be <9>

R1C3 is the only square in row 1 that can be <3>

R3C2 is the only square in row 3 that can be <7>

R4C5 is the only square in row 4 that can be <2>

R6C5 is the only square in row 6 that can be <3>

R5C8 is the only square in row 5 that can be <3>

R8C7 is the only square in row 8 that can be <3>

R5C2 is the only square in column 2 that can be <1>

R9C5 is the only square in column 5 that can be <7>

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

Squares R9C4 and R9C7 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C1 - removing <4> from <1249> leaving <129>

R9C3 - removing <5> from <159> leaving <19>

R9C9 - removing <45> from <2459> leaving <29>

Squares R5C1 and R6C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C1 - removing <8> from <1248> leaving <124>

R7C1 - removing <6> from <2469> leaving <249>

Intersection of column 7 with block 3. The values <18> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain these values.

R3C9 - removing <8> from <2468> leaving <246>

Intersection of column 8 with block 9. The value <5> only appears in one or more of squares R7C8, R8C8 and R9C8 of column 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R7C9 - removing <5> from <24569> leaving <2469>

R9C7 - removing <5> from <45> leaving <4>

R9C4 can only be <5>

R2C7 can only be <8>

R2C3 can only be <9>

R3C7 can only be <1>

R3C3 can only be <8>

R1C7 can only be <5>

R4C4 can only be <7>

R8C5 can only be <4>

R1C9 can only be <9>

R1C1 can only be <1>

R9C9 can only be <2>

R2C8 can only be <2>

R9C3 can only be <1>

R2C2 can only be <4>

R3C8 can only be <6>

R3C9 can only be <4>

R8C8 can only be <5>

R3C1 can only be <2>

R4C9 can only be <5>

R6C4 can only be <6>

R5C9 can only be <8>

R5C1 can only be <6>

R6C9 can only be <7>

R6C1 can only be <8>

R5C4 can only be <4>

R8C2 can only be <8>

R5C5 can only be <5>

R8C3 can only be <6>

R7C8 can only be <9>

R9C1 can only be <9>

R7C9 can only be <6>

R7C2 can only be <2>

R7C1 can only be <4>

R7C3 can only be <5>



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