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Daily Sudoku Answer 



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Aug 06 - Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s038391



Reasoning 



R5C7 can only be <5>

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

R2C9 is the only square in row 2 that can be <5>

R9C1 is the only square in row 9 that can be <5>

R4C1 is the only square in column 1 that can be <6>

R6C6 is the only square in block 5 that can be <2>

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

R6C8 is the only square in row 6 that can be <9>

R3C7 is the only square in row 3 that can be <9>

R3C8 is the only square in row 3 that can be <2>

R3C6 is the only square in row 3 that can be <3>

R4C5 is the only square in row 4 that can be <9>

R9C7 is the only square in block 9 that can be <6>

R7C4 is the only square in column 4 that can be <6>

R8C7 is the only square in column 7 that can be <2>

R8C8 is the only square in row 8 that can be <3>

R9C4 is the only square in column 4 that can be <2>

Squares R7C9 and R9C9 in column 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C9 - removing <7> from <137> leaving <13>

R6C9 - removing <4> from <134> leaving <13>

Intersection of row 2 with block 1. The values <39> 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 these values.

R1C3 - removing <3> from <1348> leaving <148>

Intersection of row 6 with block 4. The value <4> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.

R4C2 - removing <4> from <348> leaving <38>

R5C2 - removing <4> from <1248> leaving <128>

R5C3 - removing <4> from <1248> leaving <128>

Intersection of row 9 with block 7. The value <1> 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.

R8C1 - removing <1> from <148> leaving <48>

R8C2 - removing <1> from <1478> leaving <478>

Intersection of column 1 with block 1. The value <1> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R1C3 - removing <1> from <148> leaving <48>

R2C2 - removing <1> from <1389> leaving <389>

R2C3 - removing <1> from <1389> leaving <389>

Squares R1C1<148>, R1C3<48> and R3C1<14> in block 1 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <148>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C2 - removing <8> from <389> leaving <39>

R2C3 - removing <8> from <389> leaving <39>

Intersection of row 2 with block 2. The value <8> 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.

R1C6 - removing <8> from <468> leaving <46>

Squares R7C5<478>, R7C6<48> and R7C9<47> in row 7 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <478>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R7C2 - removing <478> from <24789> leaving <29>

R7C3 - removing <48> from <2489> leaving <29>

Intersection of row 7 with block 8. The value <8> 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.

R8C4 - removing <8> from <148> leaving <14>

R8C5 - removing <8> from <1478> leaving <147>

R4C4 is the only square in column 4 that can be <8>

R4C2 can only be <3>

R5C5 can only be <4>

R5C8 can only be <1>

R2C8 can only be <6>

R6C9 can only be <3>

R1C9 can only be <1>

R4C7 can only be <7>

R2C6 can only be <8>

R1C8 can only be <7>

R2C2 can only be <9>

R4C8 can only be <4>

R1C7 can only be <3>

R2C3 can only be <3>

R7C2 can only be <2>

R2C5 can only be <1>

R7C6 can only be <4>

R7C3 can only be <9>

R5C2 can only be <8>

R7C9 can only be <7>

R1C6 can only be <6>

R8C4 can only be <1>

R7C5 can only be <8>

R9C9 can only be <4>

R8C5 can only be <7>

R3C4 can only be <4>

R9C3 can only be <1>

R3C1 can only be <1>

R5C3 can only be <2>

R8C2 can only be <4>

R8C1 can only be <8>

R6C2 can only be <1>

R9C2 can only be <7>

R6C3 can only be <4>

R1C3 can only be <8>

R1C1 can only be <4>



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