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Daily Sudoku Answer 



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Aug 12 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s041737



Reasoning 



R1C8 is the only square in row 1 that can be <7>

R2C7 is the only square in row 2 that can be <5>

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

R2C3 is the only square in row 2 that can be <9>

R7C3 can only be <4>

R3C2 is the only square in row 3 that can be <4>

R4C2 is the only square in row 4 that can be <7>

R6C8 is the only square in row 6 that can be <4>

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

R8C7 is the only square in row 8 that can be <4>

R9C4 is the only square in row 9 that can be <4>

R9C3 is the only square in row 9 that can be <7>

R8C3 can only be <2>

R8C6 can only be <1>

R9C2 can only be <9>

R8C5 can only be <3>

R9C7 can only be <6>

R9C8 can only be <5>

R9C6 can only be <2>

R7C8 can only be <9>

R7C7 can only be <3>

R8C9 can only be <7>

R7C4 can only be <6>

R7C5 can only be <5>

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

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

R6C9 can only be <3>

R6C6 is the only square in row 6 that can be <5>

Squares R5C1 and R5C8 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C2 - removing <2> from <236> leaving <36>

R5C3 - removing <1> from <1368> leaving <368>

R5C5 - removing <12> from <1269> leaving <69>

R5C7 - removing <12> from <1289> leaving <89>

Squares R1C7 and R3C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C7 - removing <12> from <1289> leaving <89>

Squares R4C6 and R4C7 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C5 - removing <9> from <129> leaving <12>

Intersection of column 6 with block 2. The value <6> only appears in one or more of squares R1C6, R2C6 and R3C6 of column 6. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R3C5 - removing <6> from <1269> leaving <129>

Squares R2C4 and R4C5 form a remote naked pair. <12> can be removed from any square that is common to their groups.

R3C5 - removing <12> from <129> leaving <9>

R6C4 - removing <12> from <128> leaving <8>

R3C6 can only be <6>

R5C5 can only be <6>

R3C3 can only be <1>

R1C6 can only be <8>

R5C2 can only be <3>

R4C6 can only be <9>

R3C7 can only be <2>

R6C3 can only be <6>

R2C1 can only be <2>

R1C7 can only be <1>

R4C7 can only be <8>

R5C7 can only be <9>

R5C3 can only be <8>

R6C2 can only be <2>

R1C3 can only be <3>

R1C4 can only be <2>

R2C4 can only be <1>

R5C1 can only be <1>

R1C2 can only be <6>

R5C8 can only be <2>

R4C8 can only be <1>

R6C5 can only be <1>

R4C5 can only be <2>



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