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Daily Sudoku Answer 



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Oct 04 - Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R2C1 can only be <4>

R2C7 is the only square in row 2 that can be <8>

R5C8 is the only square in row 5 that can be <3>

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

R6C5 is the only square in row 6 that can be <8>

R8C4 is the only square in row 8 that can be <9>

R9C3 is the only square in row 9 that can be <8>

R5C1 is the only square in row 5 that can be <8>

R5C9 is the only square in row 5 that can be <7>

R4C1 is the only square in row 4 that can be <7>

R6C6 is the only square in row 6 that can be <7>

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

R9C4 is the only square in row 9 that can be <7>

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

Squares R4C5 and R5C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C5 - removing <15> from <124569> leaving <2469>

R3C5 - removing <5> from <24569> leaving <2469>

R7C5 - removing <15> from <12456> leaving <246>

R9C5 - removing <1> from <1246> leaving <246>

Intersection of row 2 with block 1. The value <9> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R3C2 - removing <9> from <23569> leaving <2356>

R3C3 - removing <9> from <2569> leaving <256>

Intersection of row 2 with block 2. The value <1> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. 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 <1> from <156> leaving <56>

R1C6 - removing <1> from <1245> leaving <245>

Intersection of row 4 with block 4. The value <2> only appears in one or more of squares R4C1, R4C2 and R4C3 of row 4. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R6C2 - removing <2> from <2569> leaving <569>

Intersection of column 8 with block 3. The value <4> only appears in one or more of squares R1C8, R2C8 and R3C8 of column 8. 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 <4> from <46> leaving <6>

R6C9 can only be <2>

R9C5 is the only square in row 9 that can be <6>

R1C4 is the only square in row 1 that can be <6>

R2C4 can only be <1>

R2C6 can only be <3>

R7C4 can only be <5>

R7C1 can only be <2>

R7C5 can only be <4>

R1C1 can only be <5>

R7C2 can only be <1>

R3C3 can only be <2>

R3C2 can only be <3>

R3C5 can only be <9>

R3C8 can only be <4>

R1C5 can only be <2>

R3C6 can only be <5>

R7C7 can only be <6>

R9C2 can only be <4>

R9C9 can only be <1>

R8C3 can only be <5>

R9C6 can only be <2>

R8C9 can only be <4>

R8C7 can only be <2>

R1C6 can only be <4>

R4C3 can only be <9>

R8C6 can only be <1>

R4C8 can only be <1>

R2C3 can only be <6>

R4C5 can only be <5>

R1C8 can only be <9>

R5C7 can only be <5>

R5C2 can only be <6>

R5C5 can only be <1>

R6C7 can only be <9>

R6C8 can only be <6>

R1C7 can only be <1>

R6C2 can only be <5>

R2C2 can only be <9>

R5C3 can only be <4>

R4C2 can only be <2>



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