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Daily Sudoku Answer 



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Jul 31 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s043746



Reasoning 



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

R7C2 is the only square in row 7 that can be <2>

R6C1 is the only square in column 1 that can be <8>

R6C6 is the only square in row 6 that can be <9>

R2C5 is the only square in column 5 that can be <2>

Squares R1C1 and R7C1 in column 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C1 - removing <4> from <149> leaving <19>

R4C1 - removing <4> from <149> leaving <19>

Intersection of row 3 with block 2. The value <1> 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 this value.

R2C4 - removing <1> from <1345> leaving <345>

Intersection of row 4 with block 5. The value <7> 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 this value.

R5C4 - removing <7> from <13478> leaving <1348>

R5C5 - removing <7> from <1347> leaving <134>

R5C6 - removing <7> from <13478> leaving <1348>

Intersection of row 6 with block 6. The value <6> only appears in one or more of squares R6C7, R6C8 and R6C9 of row 6. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.

R5C7 - removing <6> from <467> leaving <47>

R5C8 - removing <6> from <1567> leaving <157>

Intersection of row 7 with block 8. The value <3> only appears in one or more of squares R7C4, R7C5 and R7C6 of row 7. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R9C4 - removing <3> from <378> leaving <78>

R9C5 - removing <3> from <37> leaving <7>

R9C4 can only be <8>

R1C6 is the only square in row 1 that can be <7>

R1C3 is the only square in row 1 that can be <5>

R2C4 is the only square in row 2 that can be <5>

R4C4 is the only square in row 4 that can be <7>

R4C9 is the only square in row 4 that can be <2>

R8C9 can only be <5>

R7C8 can only be <6>

R7C1 can only be <4>

R3C8 can only be <9>

R6C8 can only be <1>

R9C9 can only be <3>

R9C7 can only be <9>

R8C8 can only be <7>

R7C4 can only be <3>

R1C1 can only be <6>

R8C2 can only be <9>

R7C6 can only be <5>

R8C3 can only be <8>

R9C3 can only be <6>

R8C7 can only be <2>

R5C8 can only be <5>

R3C9 is the only square in row 3 that can be <6>

R6C9 can only be <4>

R6C4 can only be <2>

R6C7 can only be <6>

R5C7 can only be <7>

R4C2 is the only square in row 4 that can be <5>

R5C2 is the only square in row 5 that can be <6>

R5C6 is the only square in row 5 that can be <8>

R5C5 is the only square in row 5 that can be <3>

R1C5 can only be <4>

R1C7 can only be <3>

R8C5 can only be <1>

R3C4 can only be <1>

R2C7 can only be <4>

R2C2 can only be <3>

R3C6 can only be <3>

R5C4 can only be <4>

R3C2 can only be <4>

R5C3 can only be <1>

R4C6 can only be <1>

R8C6 can only be <4>

R4C1 can only be <9>

R2C3 can only be <9>

R2C1 can only be <1>

R4C3 can only be <4>



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