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Daily Sudoku Answer 



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Feb 12 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C7 can only be <7>

R4C8 can only be <5>

R1C2 is the only square in row 1 that can be <7>

R3C5 is the only square in row 3 that can be <7>

R5C5 is the only square in row 5 that can be <9>

R7C8 is the only square in row 7 that can be <7>

R1C9 is the only square in column 9 that can be <5>

R5C2 is the only square in block 4 that can be <2>

Squares R5C7 and R5C8 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C4 - removing <34> from <1347> leaving <17>

R5C6 - removing <4> from <145> leaving <15>

Intersection of row 1 with block 3. The value <3> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R2C7 - removing <3> from <12346> leaving <1246>

R2C8 - removing <3> from <12348> leaving <1248>

R3C7 - removing <3> from <1346> leaving <146>

R3C8 - removing <3> from <13489> leaving <1489>

R3C9 - removing <3> from <3469> leaving <469>

R3C2 is the only square in row 3 that can be <3>

Intersection of row 3 with block 3. The value <6> 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.

R2C7 - removing <6> from <1246> leaving <124>

Intersection of row 4 with block 5. The values <268> only appears in one or more of squares R4C4, R4C5 and R4C6 of row 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.

R6C5 - removing <8> from <358> leaving <35>

R6C6 - removing <8> from <458> leaving <45>

Intersection of row 9 with block 7. The value <5> only appears in one or more of squares R9C1, R9C2 and R9C3 of row 9. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R8C2 - removing <5> from <1568> leaving <168>

R8C3 - removing <5> from <34568> leaving <3468>

Intersection of column 2 with block 7. The values <19> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.

R7C1 - removing <9> from <2489> leaving <248>

R9C1 - removing <9> from <259> leaving <25>

Intersection of column 9 with block 9. The value <3> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 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 <12346> leaving <1246>

R8C8 - removing <3> from <1234> leaving <124>

R9C8 - removing <3> from <1239> leaving <129>

Squares R3C6<14>, R5C6<15> and R6C6<45> in column 6 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <145>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C6 - removing <4> from <24> leaving <2>

R8C6 - removing <15> from <12568> leaving <268>

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

R6C5 can only be <3>

R2C5 can only be <1>

R3C6 can only be <4>

R6C6 can only be <5>

R2C4 can only be <3>

R6C2 can only be <8>

R5C6 can only be <1>

R5C4 can only be <7>

R6C3 can only be <7>

R6C4 can only be <4>

R5C3 can only be <5>

Squares R1C7 and R5C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C7 - removing <4> from <24> leaving <2>

R8C7 - removing <4> from <1246> leaving <126>

R8C8 is the only square in row 8 that can be <2>

Squares R8C2 and R8C7 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R8C3 - removing <6> from <3468> leaving <348>

R8C6 - removing <6> from <68> leaving <8>

R8C9 - removing <6> from <346> leaving <34>

R4C6 can only be <6>

R7C5 can only be <2>

R4C4 can only be <2>

R4C5 can only be <8>

R9C1 is the only square in row 9 that can be <2>

R9C2 is the only square in row 9 that can be <5>

R2C2 can only be <6>

R8C2 can only be <1>

R8C7 can only be <6>

R7C2 can only be <9>

R3C7 can only be <1>

R7C9 can only be <4>

R7C1 can only be <8>

R8C9 can only be <3>

R8C3 can only be <4>

R9C9 can only be <9>

R9C8 can only be <1>

R3C9 can only be <6>

R7C3 can only be <6>

R3C1 can only be <9>

R7C4 can only be <1>

R9C3 can only be <3>

R9C4 can only be <6>

R2C3 can only be <8>

R2C8 can only be <4>

R2C1 can only be <5>

R5C8 can only be <3>

R1C7 can only be <3>

R3C8 can only be <8>

R1C1 can only be <4>

R5C7 can only be <4>

R1C8 can only be <9>



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