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Daily Sudoku Answer 



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Nov 22 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C4 is the only square in row 1 that can be <5>

R3C7 is the only square in row 3 that can be <4>

R9C6 is the only square in row 9 that can be <9>

R2C6 can only be <2>

R2C4 can only be <9>

R2C5 can only be <3>

R3C6 can only be <6>

R8C6 can only be <7>

R5C6 can only be <5>

R4C6 can only be <8>

R7C8 is the only square in column 8 that can be <5>

R8C2 is the only square in column 2 that can be <5>

R7C2 is the only square in column 2 that can be <4>

R2C8 is the only square in column 8 that can be <8>

Squares R6C1 and R6C4 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C3 - removing <6> from <569> leaving <59>

R6C7 - removing <6> from <5689> leaving <589>

R6C9 - removing <6> from <68> leaving <8>

R8C3 is the only square in row 8 that can be <8>

R7C7 is the only square in row 7 that can be <8>

Intersection of row 4 with block 6. The value <2> only appears in one or more of squares R4C7, R4C8 and R4C9 of row 4. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.

R5C7 - removing <2> from <2679> leaving <679>

R5C9 - removing <2> from <267> leaving <67>

Intersection of row 7 with block 7. The value <7> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. 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 <7> from <12367> leaving <1236>

R9C2 - removing <7> from <37> leaving <3>

R9C3 - removing <7> from <12367> leaving <1236>

R3C2 can only be <9>

R3C8 can only be <2>

R1C2 can only be <7>

R9C8 can only be <7>

R1C8 can only be <9>

R2C1 can only be <1>

R1C7 can only be <6>

R2C7 can only be <7>

R3C3 can only be <3>

R3C9 can only be <1>

R1C3 can only be <2>

R8C9 can only be <2>

R8C5 can only be <4>

R9C7 can only be <1>

R9C3 can only be <6>

R1C9 can only be <3>

R5C7 can only be <9>

R6C7 can only be <5>

R6C3 can only be <9>

R4C7 can only be <2>

R8C4 can only be <1>

R5C5 can only be <2>

R9C1 can only be <2>

R5C3 can only be <7>

R5C9 can only be <6>

R4C3 can only be <5>

R7C3 can only be <1>

R4C1 can only be <6>

R5C4 can only be <4>

R4C9 can only be <7>

R7C4 can only be <2>

R7C1 can only be <7>

R6C1 can only be <4>

R5C1 can only be <3>

R6C4 can only be <6>



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