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Daily Sudoku Answer 



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Nov 14 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C9 can only be <1>

R8C1 can only be <1>

R2C1 can only be <5>

R8C3 can only be <4>

R9C3 can only be <7>

R7C2 can only be <8>

R2C7 can only be <7>

R5C1 can only be <3>

R5C9 can only be <2>

R8C9 can only be <3>

R4C8 is the only square in row 4 that can be <3>

R5C3 is the only square in row 5 that can be <5>

R5C8 is the only square in row 5 that can be <6>

R6C7 is the only square in row 6 that can be <8>

Squares R9C4 and R9C7 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C5 - removing <24> from <2346> leaving <36>

R9C6 - removing <24> from <2346> leaving <36>

Squares R2C4 and R9C4 in column 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C4 - removing <2> from <12579> leaving <1579>

R7C4 - removing <4> from <1457> leaving <157>

R8C4 - removing <2> from <259> leaving <59>

Intersection of block 5 with column 5. The values <247> only appears in one or more of squares R4C5, R5C5 and R6C5 of block 5. These squares are the ones that intersect with column 5. Thus, the other (non-intersecting) squares of column 5 cannot contain these values.

R2C5 - removing <24> from <2346> leaving <36>

R3C5 - removing <27> from <12579> leaving <159>

R7C5 - removing <47> from <1457> leaving <15>

R8C5 - removing <2> from <2589> leaving <589>

Squares R2C5 and R9C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C5 - removing <6> from <15689> leaving <1589>

Squares R9C5, R9C6, R2C5 and R2C6 form a Type-1 Unique Rectangle on <36>.

R2C6 - removing <36> from <2346> leaving <24>

R2C5 is the only square in row 2 that can be <3>

R9C5 can only be <6>

R9C6 can only be <3>

R2C3 is the only square in row 2 that can be <6>

R1C3 can only be <1>

R3C2 can only be <2>

R3C6 can only be <7>

R7C6 can only be <4>

R7C8 can only be <5>

R2C6 can only be <2>

R9C4 can only be <2>

R7C5 can only be <1>

R3C8 can only be <9>

R8C7 can only be <2>

R8C6 can only be <8>

R9C7 can only be <4>

R2C4 can only be <4>

R5C7 can only be <1>

R6C8 can only be <4>

R1C7 can only be <5>

R4C7 can only be <9>

R6C2 can only be <7>

R7C4 can only be <7>

R3C5 can only be <5>

R1C6 can only be <6>

R1C4 can only be <9>

R3C4 can only be <1>

R8C5 can only be <9>

R4C3 can only be <2>

R6C5 can only be <2>

R5C2 can only be <4>

R6C3 can only be <9>

R4C5 can only be <4>

R8C4 can only be <5>

R1C5 can only be <8>

R4C2 can only be <1>

R5C5 can only be <7>



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