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Daily Sudoku Answer 



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Feb 20 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R8C8 can only be <7>

R2C8 can only be <8>

R5C8 can only be <3>

R7C7 can only be <9>

R7C9 can only be <4>

R9C7 can only be <3>

R9C9 can only be <8>

R1C9 is the only square in row 1 that can be <6>

R1C6 is the only square in row 1 that can be <8>

R1C3 is the only square in row 1 that can be <9>

R3C1 is the only square in row 3 that can be <3>

R3C5 is the only square in row 3 that can be <5>

R4C4 is the only square in row 4 that can be <3>

R5C4 is the only square in row 5 that can be <5>

R5C6 is the only square in row 5 that can be <6>

R5C5 is the only square in row 5 that can be <8>

R5C3 is the only square in row 5 that can be <4>

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

R6C1 is the only square in row 6 that can be <8>

R7C1 is the only square in row 7 that can be <6>

R9C1 is the only square in row 9 that can be <4>

R9C4 is the only square in row 9 that can be <9>

R6C5 is the only square in row 6 that can be <9>

Intersection of column 7 with block 3. The value <1> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R3C9 - removing <1> from <127> leaving <27>

Intersection of block 7 with column 3. The value <7> only appears in one or more of squares R7C3, R8C3 and R9C3 of block 7. These squares are the ones that intersect with column 3. Thus, the other (non-intersecting) squares of column 3 cannot contain this value.

R3C3 - removing <7> from <127> leaving <12>

Intersection of row 3 with block 3. The value <7> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <7> from <127> leaving <12>

Squares R1C1 and R5C7 form a remote naked pair. <27> can be removed from any square that is common to their groups.

R1C7 - removing <2> from <12> leaving <1>

R1C4 can only be <7>

R1C1 can only be <2>

R6C4 can only be <1>

R2C5 can only be <1>

R2C2 can only be <7>

R8C5 can only be <2>

R8C2 can only be <1>

R7C5 can only be <7>

R4C1 can only be <7>

R3C3 can only be <1>

R5C2 can only be <2>

R9C3 can only be <7>

R4C6 can only be <2>

R4C9 can only be <1>

R6C6 can only be <7>

R5C7 can only be <7>

R3C7 can only be <2>

R6C9 can only be <2>

R9C6 can only be <1>

R3C9 can only be <7>

R7C3 can only be <2>



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