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Daily Sudoku Answer 



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Feb 08 - Very Hard
Puzzle Copyright © Kevin Stone

Share Link – www.brainbashers.com/s026540



Reasoning 



R8C8 can only be <3>

R9C7 can only be <8>

R6C7 can only be <3>

R7C7 can only be <6>

R3C7 can only be <4>

R3C6 is the only square in row 3 that can be <2>

R4C8 is the only square in row 4 that can be <4>

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

R7C9 can only be <1>

R2C9 can only be <5>

R9C8 can only be <2>

R3C8 can only be <8>

R1C8 can only be <1>

R6C8 can only be <5>

R5C1 is the only square in row 5 that can be <3>

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

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

R9C1 is the only square in column 1 that can be <4>

R4C1 is the only square in column 1 that can be <8>

Squares R4C6 and R8C6 in column 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C6 - removing <6> from <568> leaving <58>

R5C6 - removing <9> from <189> leaving <18>

R9C6 - removing <9> from <159> leaving <15>

Intersection of row 3 with block 1. The value <5> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. 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 <5> from <357> leaving <37>

Intersection of row 9 with block 8. The values <15> only appears in one or more of squares R9C4, R9C5 and R9C6 of row 9. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.

R7C4 - removing <5> from <58> leaving <8>

R6C9 is the only square in row 6 that can be <8>

R5C9 can only be <9>

R5C4 can only be <1>

R5C6 can only be <8>

R1C6 can only be <5>

R9C6 can only be <1>

R1C5 is the only square in row 1 that can be <8>

R2C5 is the only square in row 2 that can be <1>

R9C4 is the only square in row 9 that can be <5>

Intersection of column 1 with block 7. The value <7> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R7C3 - removing <7> from <357> leaving <35>

Squares R2C2 and R2C4 in row 2 and R6C2 and R6C4 in row 6 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 2 and 4 can be removed.

R4C2 - removing <9> from <679> leaving <67>

R9C2 - removing <9> from <39> leaving <3>

R9C5 can only be <9>

R7C3 can only be <5>

R3C5 can only be <6>

R8C6 can only be <6>

R3C9 can only be <3>

R8C5 can only be <7>

R1C4 can only be <4>

R1C9 can only be <6>

R7C1 can only be <7>

R3C3 can only be <9>

R8C1 can only be <9>

R7C5 can only be <3>

R4C6 can only be <9>

R1C2 can only be <7>

R2C4 can only be <9>

R2C2 can only be <4>

R6C4 can only be <6>

R3C1 can only be <5>

R4C3 can only be <7>

R4C2 can only be <6>

R1C3 can only be <3>

R6C2 can only be <9>



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