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Daily Sudoku Answer 



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Mar 30 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R9C9 can only be <5>

R1C9 is the only square in row 1 that can be <7>

R2C3 is the only square in row 2 that can be <8>

R3C2 is the only square in row 3 that can be <4>

R3C6 is the only square in row 3 that can be <5>

R3C9 is the only square in row 3 that can be <9>

R7C2 is the only square in row 7 that can be <5>

R7C4 is the only square in row 7 that can be <9>

R9C1 is the only square in row 9 that can be <7>

Intersection of row 2 with block 3. The value <1> only appears in one or more of squares R2C7, R2C8 and R2C9 of row 2. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <1> from <1236> leaving <236>

R3C8 - removing <1> from <136> leaving <36>

Squares R3C4 and R3C8 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C1 - removing <36> from <1236> leaving <12>

R3C5 - removing <36> from <1236> leaving <12>

Squares R5C1<36>, R5C6<38> and R5C9<68> in row 5 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <368>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C3 - removing <36> from <3569> leaving <59>

R5C4 - removing <36> from <346> leaving <4>

R5C7 - removing <6> from <4569> leaving <459>

R4C5 can only be <6>

R9C5 is the only square in column 5 that can be <4>

R9C7 can only be <3>

R9C3 can only be <2>

R4C3 can only be <9>

R4C7 can only be <4>

R5C3 can only be <5>

R4C8 can only be <7>

R4C2 can only be <2>

R5C7 can only be <9>

R6C7 is the only square in row 6 that can be <5>

R6C2 is the only square in row 6 that can be <7>

R8C8 is the only square in row 8 that can be <4>

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

R5C6 can only be <3>

R5C1 can only be <6>

R7C6 can only be <2>

R6C5 can only be <8>

R6C8 can only be <6>

R6C3 can only be <3>

R3C8 can only be <3>

R5C9 can only be <8>

R7C5 can only be <3>

R2C6 can only be <7>

R3C4 can only be <6>

R2C8 can only be <1>

R7C9 can only be <6>

R7C1 can only be <1>

R8C4 can only be <7>

R8C7 can only be <1>

R8C3 can only be <6>

R7C8 can only be <8>

R2C4 can only be <3>

R3C1 can only be <2>

R8C2 can only be <3>

R1C3 can only be <1>

R1C5 can only be <2>

R1C1 can only be <3>

R1C7 can only be <6>

R3C5 can only be <1>

R2C7 can only be <2>

R2C2 can only be <6>



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