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Daily Sudoku Answer 



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Oct 02 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s076084



Reasoning 



R4C7 can only be <5>

R5C5 can only be <1>

R9C2 can only be <1>

R4C3 can only be <4>

R4C2 can only be <7>

R4C8 can only be <2>

R5C1 can only be <3>

R5C3 can only be <5>

R5C7 can only be <8>

R8C1 can only be <4>

R6C2 can only be <8>

R6C3 can only be <1>

R5C2 can only be <6>

R5C9 can only be <7>

R6C7 can only be <3>

R5C8 can only be <4>

R6C8 can only be <9>

R2C1 can only be <7>

R3C8 is the only square in row 3 that can be <7>

R8C6 is the only square in row 8 that can be <7>

Squares R8C4 and R8C7 in row 8 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.

R8C5 - removing <6> from <5689> leaving <589>

R8C8 - removing <16> from <13568> leaving <358>

Intersection of row 3 with block 2. The value <1> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.

R2C4 - removing <1> from <1346> leaving <346>

R2C6 - removing <1> from <159> leaving <59>

Squares R1C2 and R1C8 in row 1 and R7C2 and R7C8 in row 7 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in columns 2 and 8 can be removed.

R2C2 - removing <3> from <2345> leaving <245>

R2C8 - removing <3> from <1368> leaving <168>

R3C2 - removing <3> from <235> leaving <25>

R8C2 - removing <3> from <239> leaving <29>

R8C8 - removing <3> from <358> leaving <58>

R3C4 is the only square in row 3 that can be <3>

R3C6 is the only square in row 3 that can be <1>

Squares R1C5 and R2C4 in block 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R2C5 - removing <46> from <24569> leaving <259>

Squares R1C5 and R1C8 in row 1 and R9C5 and R9C8 in row 9 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 5 and 8 can be removed.

R2C8 - removing <6> from <168> leaving <18>

Squares R1C8 (XY), R2C9 (XZ) and R9C8 (YZ) form an XY-Wing pattern on <8>. All squares that are buddies of both the XZ and YZ squares cannot be <8>.

R2C8 - removing <8> from <18> leaving <1>

R8C9 - removing <8> from <38> leaving <3>

R2C7 can only be <6>

R8C3 can only be <2>

R2C9 can only be <8>

R7C8 can only be <5>

R2C4 can only be <4>

R8C7 can only be <1>

R1C8 can only be <3>

R7C6 can only be <9>

R8C8 can only be <8>

R8C2 can only be <9>

R2C3 can only be <3>

R8C4 can only be <6>

R9C8 can only be <6>

R9C5 can only be <8>

R1C2 can only be <4>

R7C4 can only be <1>

R1C5 can only be <6>

R7C2 can only be <3>

R7C5 can only be <4>

R2C6 can only be <5>

R8C5 can only be <5>

R3C5 can only be <2>

R2C2 can only be <2>

R3C2 can only be <5>

R2C5 can only be <9>



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