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Daily Sudoku Answer 



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Nov 11 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R1C1 is the only square in row 1 that can be <5>

R2C6 is the only square in row 2 that can be <6>

R4C9 is the only square in row 4 that can be <5>

R4C5 is the only square in row 4 that can be <6>

R5C1 is the only square in row 5 that can be <4>

R6C1 is the only square in row 6 that can be <1>

R7C9 is the only square in row 7 that can be <4>

R7C7 is the only square in row 7 that can be <5>

R9C6 is the only square in row 9 that can be <5>

R9C5 is the only square in row 9 that can be <1>

R3C3 is the only square in row 3 that can be <1>

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

R2C8 is the only square in column 8 that can be <2>

R2C2 can only be <3>

R2C4 can only be <8>

R6C2 is the only square in column 2 that can be <2>

R5C9 is the only square in column 9 that can be <7>

R5C7 is the only square in row 5 that can be <6>

R3C7 can only be <9>

R3C9 can only be <6>

Squares R5C3 and R5C6 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C4 - removing <9> from <239> leaving <23>

R5C5 - removing <89> from <2389> leaving <23>

Squares R5C3 and R7C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R9C3 - removing <89> from <2789> leaving <27>

Squares R5C4 and R5C5 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R6C5 - removing <3> from <389> leaving <89>

Intersection of column 5 with block 2. The value <7> only appears in one or more of squares R1C5, R2C5 and R3C5 of column 5. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R1C4 - removing <7> from <279> leaving <29>

Squares R6C5 and R7C3 form a remote naked pair. <89> can be removed from any square that is common to their groups.

R7C5 - removing <89> from <389> leaving <3>

R7C1 can only be <8>

R5C5 can only be <2>

R5C4 can only be <3>

R3C5 can only be <7>

R7C3 can only be <9>

R4C1 can only be <7>

R5C3 can only be <8>

R8C2 can only be <7>

R8C4 can only be <9>

R4C2 can only be <9>

R9C3 can only be <2>

R8C6 can only be <8>

R1C4 can only be <2>

R9C4 can only be <7>

R8C8 can only be <3>

R5C6 can only be <9>

R9C7 can only be <8>

R9C1 can only be <3>

R1C3 can only be <7>

R9C9 can only be <9>

R1C7 can only be <3>

R1C5 can only be <9>

R3C1 can only be <2>

R6C5 can only be <8>

R1C9 can only be <8>

R6C9 can only be <3>

R4C8 can only be <8>

R6C8 can only be <9>



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