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Daily Sudoku Answer 



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Oct 06 - Very Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s057025



Reasoning 



R5C8 can only be <1>

R4C8 can only be <7>

R6C8 can only be <4>

R8C8 can only be <3>

R2C8 can only be <8>

R3C1 is the only square in row 3 that can be <4>

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

R3C3 is the only square in row 3 that can be <8>

R7C1 is the only square in row 7 that can be <3>

R9C1 is the only square in row 9 that can be <8>

R1C1 is the only square in column 1 that can be <7>

R5C1 is the only square in column 1 that can be <6>

R9C3 is the only square in column 3 that can be <2>

R1C7 is the only square in column 7 that can be <5>

R1C9 is the only square in column 9 that can be <3>

Squares R2C2 and R2C4 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C5 - removing <16> from <1367> leaving <37>

R2C6 - removing <1> from <137> leaving <37>

Squares R6C1 and R6C5 in row 6 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.

R6C2 - removing <1> from <159> leaving <59>

R6C9 - removing <2> from <259> leaving <59>

Squares R2C2 and R8C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R4C2 - removing <1> from <189> leaving <89>

Intersection of row 7 with block 9. The value <9> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R9C7 - removing <9> from <179> leaving <17>

R9C9 - removing <9> from <1679> leaving <167>

R7C7 is the only square in column 7 that can be <9>

Intersection of row 8 with block 8. The values <27> only appears in one or more of squares R8C4, R8C5 and R8C6 of row 8. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.

R9C5 - removing <7> from <1367> leaving <136>

R9C6 - removing <7> from <1379> leaving <139>

Intersection of block 5 with row 5. The value <9> only appears in one or more of squares R5C4, R5C5 and R5C6 of block 5. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain this value.

R5C2 - removing <9> from <589> leaving <58>

R5C9 - removing <9> from <259> leaving <25>

Intersection of block 5 with column 5. The value <1> only appears in one or more of squares R4C5, R5C5 and R6C5 of block 5. These squares are the ones that intersect with column 5. Thus, the other (non-intersecting) squares of column 5 cannot contain this value.

R1C5 - removing <1> from <168> leaving <68>

R8C5 - removing <1> from <1267> leaving <267>

R9C5 - removing <1> from <136> leaving <36>

Squares R3C7, R3C9, R9C7 and R9C9 form a Type-1 Unique Rectangle on <17>.

R9C9 - removing <17> from <167> leaving <6>

R9C5 can only be <3>

R7C9 can only be <1>

R7C3 can only be <6>

R3C9 can only be <7>

R9C7 can only be <7>

R2C5 can only be <7>

R3C7 can only be <1>

R2C6 can only be <3>

R1C3 can only be <1>

R8C2 can only be <1>

R8C6 can only be <7>

R2C2 can only be <6>

R1C6 can only be <8>

R1C5 can only be <6>

R5C6 can only be <9>

R2C4 can only be <1>

R9C4 can only be <9>

R5C4 can only be <2>

R9C6 can only be <1>

R8C5 can only be <2>

R5C9 can only be <5>

R8C4 can only be <6>

R6C5 can only be <1>

R5C2 can only be <8>

R6C9 can only be <9>

R6C1 can only be <2>

R4C5 can only be <8>

R6C2 can only be <5>

R4C9 can only be <2>

R4C2 can only be <9>

R4C1 can only be <1>



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