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Daily Sudoku Answer 



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Nov 09 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s095949



Reasoning 



R8C4 can only be <4>

R8C6 can only be <2>

R2C4 can only be <1>

R7C5 can only be <6>

R5C4 can only be <5>

R7C2 can only be <5>

R9C5 can only be <7>

R8C5 can only be <9>

R7C3 can only be <2>

R7C7 can only be <4>

R7C8 can only be <8>

R1C5 is the only square in row 1 that can be <5>

R2C9 is the only square in row 2 that can be <9>

R3C3 is the only square in row 3 that can be <5>

R8C9 is the only square in row 8 that can be <5>

R3C5 is the only square in column 5 that can be <2>

R5C7 is the only square in column 7 that can be <2>

Squares R2C5 and R2C6 in row 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R2C1 - removing <4> from <3467> leaving <367>

Intersection of column 7 with block 3. The value <7> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R3C8 - removing <7> from <147> leaving <14>

Squares R2C1 and R2C7 in row 2 and R8C1 and R8C7 in row 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in columns 1 and 7 can be removed.

R1C1 - removing <3> from <134> leaving <14>

R9C1 - removing <3> from <136> leaving <16>

Squares R1C1 and R5C1 in column 1 and R1C9 and R5C9 in column 9 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in rows 1 and 5 can be removed.

R1C2 - removing <4> from <134> leaving <13>

R5C2 - removing <4> from <14679> leaving <1679>

R5C5 - removing <4> from <1348> leaving <138>

R5C6 - removing <4> from <48> leaving <8>

R1C8 - removing <4> from <1234> leaving <123>

R5C8 - removing <4> from <3479> leaving <379>

R2C6 can only be <4>

R2C5 can only be <8>

Squares R5C5 (XY), R6C5 (XZ) and R5C9 (YZ) form an XY-Wing pattern on <4>. All squares that are buddies of both the XZ and YZ squares cannot be <4>.

R6C8 - removing <4> from <49> leaving <9>

R5C2 is the only square in row 5 that can be <9>

R9C2 is the only square in column 2 that can be <6>

R9C1 can only be <1>

R1C1 can only be <4>

R8C3 can only be <7>

R8C1 can only be <3>

R2C3 can only be <6>

R5C3 can only be <1>

R5C5 can only be <3>

R6C2 can only be <4>

R5C8 can only be <7>

R5C9 can only be <4>

R4C5 can only be <4>

R5C1 can only be <6>

R4C8 can only be <3>

R6C5 can only be <1>

R4C2 can only be <7>

R8C7 can only be <1>

R2C1 can only be <7>

R3C7 can only be <7>

R2C7 can only be <3>

R3C2 can only be <1>

R1C9 can only be <2>

R3C8 can only be <4>

R1C2 can only be <3>

R9C8 can only be <2>

R9C9 can only be <3>

R1C8 can only be <1>



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