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Daily Sudoku Answer 



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Nov 14 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C4 can only be <5>

R8C8 can only be <9>

R7C5 can only be <3>

R7C6 can only be <8>

R8C9 can only be <8>

R9C6 can only be <4>

R9C5 can only be <9>

R2C6 is the only square in row 2 that can be <5>

R5C6 can only be <2>

R5C4 can only be <7>

R3C4 can only be <3>

R6C5 can only be <5>

R1C4 can only be <2>

R4C1 is the only square in row 4 that can be <3>

R9C2 is the only square in row 9 that can be <3>

R7C7 is the only square in column 7 that can be <1>

R1C7 is the only square in column 7 that can be <8>

R1C9 is the only square in block 3 that can be <9>

R5C9 can only be <3>

R1C8 is the only square in row 1 that can be <3>

Squares R3C5 and R3C8 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C2 - removing <7> from <789> leaving <89>

R3C3 - removing <47> from <4789> leaving <89>

Intersection of row 1 with block 1. The value <6> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C2 - removing <6> from <167> leaving <17>

Intersection of block 4 with column 3. The value <7> only appears in one or more of squares R4C3, R5C3 and R6C3 of block 4. These squares are the ones that intersect with column 3. Thus, the other (non-intersecting) squares of column 3 cannot contain this value.

R1C3 - removing <7> from <467> leaving <46>

R9C3 - removing <7> from <578> leaving <58>

Squares R1C2<67>, R2C2<17> and R8C2<16> in column 2 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <167>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R5C2 - removing <1> from <1589> leaving <589>

R7C2 - removing <7> from <57> leaving <5>

R7C8 can only be <7>

R9C3 can only be <8>

R3C8 can only be <4>

R9C7 can only be <2>

R9C1 can only be <7>

R3C3 can only be <9>

R9C8 can only be <5>

R3C2 can only be <8>

R6C3 can only be <7>

R3C5 can only be <7>

R5C8 can only be <6>

R5C5 can only be <1>

R2C8 can only be <2>

R4C7 can only be <7>

R6C7 can only be <9>

R6C9 can only be <2>

R4C3 can only be <1>

R5C7 can only be <4>

R2C9 can only be <7>

R2C2 can only be <1>

R2C7 can only be <6>

R5C2 can only be <9>

R1C5 can only be <4>

R4C5 can only be <6>

R5C3 can only be <5>

R5C1 can only be <8>

R1C3 can only be <6>

R2C1 can only be <4>

R8C2 can only be <6>

R8C3 can only be <4>

R1C2 can only be <7>

R8C1 can only be <1>



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