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Daily Sudoku Answer 



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Feb 09 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C9 can only be <9>

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

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

R7C7 is the only square in row 7 that can be <6>

R8C5 is the only square in row 8 that can be <5>

R3C7 is the only square in column 7 that can be <9>

Squares R9C7 and R9C8 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C4 - removing <4> from <23489> leaving <2389>

R9C6 - removing <4> from <23489> leaving <2389>

Intersection of row 3 with block 2. The values <124> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.

R1C6 - removing <4> from <4678> leaving <678>

R2C4 - removing <4> from <489> leaving <89>

R2C5 - removing <4> from <47> leaving <7>

R2C6 - removing <4> from <46789> leaving <6789>

R1C7 is the only square in row 1 that can be <7>

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

Intersection of block 5 with row 5. The values <234> only appears in one or more of squares R5C4, R5C5 and R5C6 of block 5. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain these values.

R5C1 - removing <234> from <12348> leaving <18>

R5C3 - removing <2> from <12678> leaving <1678>

R5C7 - removing <24> from <124> leaving <1>

R5C9 - removing <4> from <4678> leaving <678>

R5C1 can only be <8>

R2C1 can only be <4>

R2C9 can only be <6>

R1C2 can only be <1>

R5C9 can only be <7>

R1C8 can only be <4>

R5C3 can only be <6>

R4C9 can only be <4>

R1C3 can only be <8>

R1C6 can only be <6>

R4C8 can only be <3>

R9C8 can only be <5>

R4C2 can only be <9>

R4C7 can only be <2>

R6C9 can only be <8>

R6C3 can only be <2>

R6C1 can only be <3>

R6C7 can only be <5>

R9C3 can only be <9>

R4C1 can only be <1>

R6C8 can only be <6>

R9C7 can only be <4>

R9C2 can only be <3>

R7C3 can only be <1>

R4C3 can only be <7>

R6C2 can only be <4>

R8C1 can only be <2>

R7C5 can only be <4>

R7C4 can only be <9>

R5C5 can only be <2>

R8C6 can only be <3>

R8C4 can only be <1>

R5C6 can only be <4>

R3C5 can only be <1>

R5C4 can only be <3>

R3C6 can only be <2>

R2C4 can only be <8>

R2C6 can only be <9>

R9C4 can only be <2>

R3C4 can only be <4>

R9C6 can only be <8>



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