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Daily Sudoku Answer 



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Mar 08 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C3 can only be <7>

R8C9 is the only square in row 8 that can be <2>

R9C5 is the only square in row 9 that can be <2>

R8C1 is the only square in column 1 that can be <4>

R1C3 is the only square in column 3 that can be <5>

R1C1 is the only square in row 1 that can be <9>

R4C1 can only be <3>

R1C9 is the only square in row 1 that can be <3>

R2C4 is the only square in row 2 that can be <9>

R3C6 is the only square in column 6 that can be <6>

R6C7 is the only square in column 7 that can be <2>

R5C4 is the only square in column 4 that can be <2>

R7C4 is the only square in column 4 that can be <5>

Squares R4C2 and R4C3 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C6 - removing <9> from <589> leaving <58>

R4C8 - removing <9> from <4589> leaving <458>

R5C6 is the only square in column 6 that can be <9>

R4C6 is the only square in column 6 that can be <5>

R5C8 is the only square in column 8 that can be <5>

R6C8 is the only square in column 8 that can be <9>

Intersection of row 1 with block 3. The value <6> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R2C7 - removing <6> from <5678> leaving <578>

R2C9 - removing <6> from <568> leaving <58>

Intersection of column 3 with block 7. The value <6> only appears in one or more of squares R7C3, R8C3 and R9C3 of column 3. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R7C2 - removing <6> from <1368> leaving <138>

R9C1 - removing <6> from <168> leaving <18>

R9C2 - removing <6> from <1689> leaving <189>

Intersection of column 9 with block 9. The value <1> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R7C8 - removing <1> from <14678> leaving <4678>

R8C8 - removing <1> from <18> leaving <8>

R8C6 can only be <1>

R4C8 can only be <4>

R4C5 can only be <8>

R5C9 can only be <6>

R6C9 can only be <8>

R6C4 can only be <1>

R2C9 can only be <5>

R7C6 can only be <8>

R9C9 can only be <1>

R1C5 can only be <1>

R6C5 can only be <7>

R3C4 can only be <8>

R6C2 can only be <6>

R5C5 can only be <4>

R9C1 can only be <8>

R7C9 can only be <4>

R1C8 can only be <6>

R1C7 can only be <8>

R7C8 can only be <7>

R3C1 can only be <7>

R3C8 can only be <1>

R7C7 can only be <6>

R9C2 can only be <9>

R9C3 can only be <6>

R4C2 can only be <2>

R9C7 can only be <5>

R7C3 can only be <3>

R2C7 can only be <7>

R2C1 can only be <6>

R2C2 can only be <8>

R3C7 can only be <4>

R5C1 can only be <1>

R4C3 can only be <9>

R3C2 can only be <3>

R5C2 can only be <7>

R7C2 can only be <1>

R3C3 can only be <2>



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