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Daily Sudoku Answer 



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Feb 24 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C5 is the only square in row 4 that can be <6>

R3C8 is the only square in row 3 that can be <6>

R7C2 is the only square in row 7 that can be <6>

R7C1 is the only square in row 7 that can be <4>

R3C1 can only be <8>

R3C5 can only be <5>

R5C4 is the only square in column 4 that can be <3>

Squares R2C9 and R3C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R8C9 - removing <3> from <135> leaving <15>

Squares R2C9 and R3C9 in block 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C7 - removing <3> from <239> leaving <29>

Squares R2C1 and R2C7 in row 2 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.

R2C3 - removing <2> from <2347> leaving <347>

Intersection of row 7 with block 9. The value <5> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R8C7 - removing <5> from <13569> leaving <1369>

R8C9 - removing <5> from <15> leaving <1>

R9C7 - removing <5> from <3569> leaving <369>

R9C8 - removing <5> from <3579> leaving <379>

R7C5 is the only square in row 7 that can be <1>

R1C4 is the only square in column 4 that can be <1>

R1C6 can only be <4>

R1C3 is the only square in row 1 that can be <7>

R2C5 is the only square in column 5 that can be <7>

R2C4 can only be <6>

R2C6 can only be <8>

R8C4 can only be <5>

R8C1 can only be <2>

R9C4 can only be <7>

R2C1 can only be <9>

R2C7 can only be <2>

R5C1 can only be <5>

R1C2 can only be <2>

R5C9 can only be <7>

R7C9 can only be <5>

R7C8 can only be <7>

R9C3 is the only square in row 9 that can be <5>

R9C2 is the only square in row 9 that can be <8>

R4C2 can only be <1>

R8C3 can only be <3>

R4C7 can only be <5>

R5C2 can only be <9>

R1C7 can only be <9>

R5C5 can only be <2>

R5C6 can only be <1>

R6C2 can only be <4>

R5C8 can only be <8>

R6C5 can only be <9>

R4C8 can only be <2>

R6C3 can only be <2>

R3C2 can only be <3>

R6C8 can only be <3>

R4C3 can only be <8>

R8C5 can only be <8>

R6C7 can only be <1>

R9C8 can only be <9>

R2C3 can only be <4>

R9C6 can only be <6>

R1C8 can only be <5>

R8C7 can only be <6>

R2C9 can only be <3>

R3C9 can only be <4>

R8C6 can only be <9>

R9C7 can only be <3>



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