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Daily Sudoku Answer 



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Nov 13 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C1 can only be <5>

R4C9 can only be <3>

R4C4 can only be <9>

R4C5 can only be <1>

R4C6 can only be <4>

R6C9 is the only square in row 6 that can be <6>

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

R5C2 is the only square in column 2 that can be <3>

Squares R1C2 and R1C3 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C7 - removing <2> from <238> leaving <38>

R1C8 - removing <7> from <378> leaving <38>

R2C8 is the only square in column 8 that can be <7>

R3C8 is the only square in column 8 that can be <9>

R3C5 can only be <5>

R3C2 can only be <6>

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

R2C9 is the only square in block 3 that can be <2>

R2C1 can only be <4>

R8C9 can only be <8>

Squares R1C3 and R5C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R8C3 - removing <27> from <1257> leaving <15>

Intersection of row 9 with block 9. The value <3> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. 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 <3> from <234> leaving <24>

R8C8 - removing <3> from <3456> leaving <456>

Squares R6C1 and R8C1 in column 1 and R6C4 and R8C4 in column 4 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in rows 6 and 8 can be removed.

R8C2 - removing <2> from <12457> leaving <1457>

R6C5 - removing <2> from <237> leaving <37>

R8C5 - removing <2> from <2369> leaving <369>

R8C7 - removing <2> from <24> leaving <4>

R5C7 can only be <8>

R7C8 can only be <6>

R5C8 can only be <4>

R1C7 can only be <3>

R7C5 can only be <2>

R8C8 can only be <5>

R8C3 can only be <1>

R9C8 can only be <3>

R9C7 can only be <2>

R1C8 can only be <8>

R7C2 can only be <4>

R5C5 can only be <7>

R8C4 can only be <3>

R8C2 can only be <7>

R2C3 can only be <5>

R8C6 can only be <9>

R2C4 can only be <8>

R8C5 can only be <6>

R9C2 can only be <5>

R2C2 can only be <1>

R2C6 can only be <3>

R6C4 can only be <2>

R2C5 can only be <9>

R6C6 can only be <8>

R5C3 can only be <2>

R6C5 can only be <3>

R6C1 can only be <7>

R8C1 can only be <2>

R1C2 can only be <2>

R1C3 can only be <7>



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