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Daily Sudoku Answer 



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Nov 11 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C4 can only be <7>

R6C4 can only be <4>

R1C5 is the only square in row 1 that can be <6>

R1C6 is the only square in row 1 that can be <4>

R2C7 is the only square in row 2 that can be <6>

R3C3 is the only square in row 3 that can be <4>

R4C3 is the only square in row 4 that can be <6>

R5C7 is the only square in row 5 that can be <4>

R5C5 is the only square in row 5 that can be <5>

R2C3 is the only square in row 2 that can be <5>

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

R3C7 is the only square in row 3 that can be <5>

R3C8 is the only square in row 3 that can be <9>

R7C6 is the only square in row 7 that can be <5>

R8C5 is the only square in row 8 that can be <4>

R9C1 is the only square in row 9 that can be <5>

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

R7C8 is the only square in column 8 that can be <2>

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

R9C5 is the only square in column 5 that can be <2>

Squares R4C6 and R6C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C6 - removing <8> from <178> leaving <17>

Intersection of row 8 with block 7. The value <3> only appears in one or more of squares R8C1, R8C2 and R8C3 of row 8. 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 <3> from <137> leaving <17>

R7C3 - removing <3> from <1379> leaving <179>

Intersection of column 1 with block 4. The values <39> only appears in one or more of squares R4C1, R5C1 and R6C1 of column 1. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain these values.

R5C3 - removing <9> from <179> leaving <17>

R6C3 - removing <3> from <137> leaving <17>

R8C3 is the only square in column 3 that can be <3>

R8C7 is the only square in row 8 that can be <9>

R4C7 can only be <2>

R4C6 can only be <8>

R6C7 can only be <1>

R6C3 can only be <7>

R6C6 can only be <2>

R5C3 can only be <1>

R7C3 can only be <9>

R9C4 is the only square in row 9 that can be <9>

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

R1C9 can only be <8>

R6C9 can only be <3>

R2C8 can only be <1>

R8C8 can only be <7>

R6C1 can only be <8>

R4C9 can only be <9>

R8C2 can only be <1>

R5C8 can only be <8>

R9C9 can only be <1>

R9C6 can only be <7>

R4C1 can only be <3>

R5C9 can only be <7>

R5C1 can only be <9>

R7C2 can only be <7>

R3C6 can only be <1>

R7C5 can only be <3>

R3C4 can only be <3>

R7C4 can only be <1>

R2C5 can only be <8>

R2C2 can only be <3>

R3C5 can only be <7>

R3C2 can only be <8>



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