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Daily Sudoku Answer 



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Oct 06 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s175106



Reasoning 



R3C6 can only be <8>

R5C9 can only be <2>

R3C4 can only be <6>

R7C6 can only be <2>

R2C5 can only be <9>

R5C6 can only be <4>

R3C7 can only be <1>

R1C5 can only be <4>

R3C9 can only be <7>

R1C9 can only be <6>

R4C4 is the only square in row 4 that can be <2>

R5C5 is the only square in row 5 that can be <6>

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

R3C1 can only be <5>

R3C3 can only be <3>

R6C5 is the only square in row 6 that can be <3>

R7C7 is the only square in row 7 that can be <6>

Squares R7C9 and R9C9 in block 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R9C7 - removing <9> from <259> leaving <25>

Intersection of column 5 with block 8. The value <1> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.

R7C4 - removing <1> from <158> leaving <58>

Squares R2C2 and R5C2 in column 2 and R2C8 and R5C8 in column 8 form a Simple X-Wing pattern on possibility <8>. All other instances of this possibility in rows 2 and 5 can be removed.

R5C4 - removing <8> from <158> leaving <15>

Squares R7C9, R9C9, R7C1 and R9C1 form a Type-2 Unique Rectangle on <19>.

R1C1 - removing <8> from <18> leaving <1>

R7C3 - removing <8> from <158> leaving <15>

R9C3 - removing <8> from <1258> leaving <125>

Squares R5C4 (XY), R5C2 (XZ) and R4C5 (YZ) form an XY-Wing pattern on <8>. All squares that are buddies of both the XZ and YZ squares cannot be <8>.

R4C3 - removing <8> from <78> leaving <7>

R4C6 can only be <9>

R6C6 can only be <7>

R6C7 is the only square in row 6 that can be <9>

Squares R7C3 (XY), R6C3 (XZ) and R7C4 (YZ) form an XY-Wing pattern on <8>. All squares that are buddies of both the XZ and YZ squares cannot be <8>.

R6C4 - removing <8> from <18> leaving <1>

R6C3 can only be <8>

R5C4 can only be <5>

R5C8 can only be <8>

R7C4 can only be <8>

R4C5 can only be <8>

R5C2 can only be <1>

R2C8 can only be <2>

R4C7 can only be <5>

R1C3 can only be <2>

R7C1 can only be <9>

R1C7 can only be <8>

R2C2 can only be <8>

R8C8 can only be <5>

R9C7 can only be <2>

R8C2 can only be <2>

R7C9 can only be <1>

R9C1 can only be <8>

R7C3 can only be <5>

R9C9 can only be <9>

R8C5 can only be <1>

R9C3 can only be <1>

R9C5 can only be <5>



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