# Daily Sudoku Answer

Aug 01 - Hard

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## Reasoning

R6C9 can only be <6>

R5C1 is the only square in row 5 that can be <4>

R7C2 is the only square in row 7 that can be <4>

R8C8 is the only square in row 8 that can be <7>

R9C3 is the only square in row 9 that can be <3>

R9C5 is the only square in row 9 that can be <4>

R1C4 is the only square in row 1 that can be <4>

R3C9 is the only square in row 3 that can be <4>

R9C7 is the only square in row 9 that can be <8>

R1C3 is the only square in column 3 that can be <5>

R7C8 is the only square in column 8 that can be <5>

R9C9 can only be <2>

R9C2 can only be <9>

R2C9 can only be <5>

R7C7 can only be <6>

R5C9 can only be <1>

R4C7 can only be <3>

R9C6 can only be <5>

R6C8 can only be <9>

R1C8 can only be <3>

R3C8 can only be <6>

R5C7 can only be <5>

R2C2 is the only square in row 2 that can be <6>

R6C4 is the only square in row 6 that can be <3>

R2C6 is the only square in row 2 that can be <3>

R2C5 is the only square in row 2 that can be <7>

R1C1 is the only square in column 1 that can be <9>

Squares R3C2 and R3C3 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C4 - removing <2> from <129> leaving <19>

R3C7 - removing <2> from <129> leaving <19>

Intersection of row 7 with block 7. The value <8> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R8C1 - removing <8> from <268> leaving <26>

R8C3 - removing <8> from <1268> leaving <126>

R7C1 is the only square in column 1 that can be <8>

Intersection of block 2 with column 4. The value <9> only appears in one or more of squares R1C4, R2C4 and R3C4 of block 2. These squares are the ones that intersect with column 4. Thus, the other (non-intersecting) squares of column 4 cannot contain this value.

R5C4 - removing <9> from <89> leaving <8>

R8C4 - removing <9> from <1289> leaving <128>

R6C5 can only be <2>

R6C3 can only be <8>

R1C5 can only be <1>

R1C7 can only be <2>

R4C5 can only be <6>

R3C4 can only be <9>

R2C7 can only be <9>

R2C4 can only be <2>

R3C7 can only be <1>

R4C1 can only be <2>

R5C5 can only be <9>

R5C6 can only be <7>

R8C5 can only be <8>

R5C3 can only be <6>

R4C6 can only be <1>

R8C4 can only be <1>

R4C2 can only be <7>

R8C1 can only be <6>

R3C2 can only be <2>

R7C6 can only be <2>

R7C3 can only be <1>

R8C6 can only be <9>

R8C3 can only be <2>

R3C3 can only be <7>

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