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Daily Sudoku Answer 



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Oct 09 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s035126



Reasoning 



R6C8 is the only square in row 6 that can be <3>

R6C2 is the only square in row 6 that can be <7>

R7C5 is the only square in row 7 that can be <2>

R6C5 can only be <5>

R6C1 can only be <4>

R6C9 can only be <2>

R3C7 is the only square in row 3 that can be <2>

R4C2 is the only square in row 4 that can be <2>

R7C2 is the only square in row 7 that can be <3>

R8C8 is the only square in row 8 that can be <1>

R8C3 is the only square in row 8 that can be <4>

R9C4 is the only square in row 9 that can be <3>

R8C2 is the only square in column 2 that can be <6>

R8C4 can only be <8>

R8C7 can only be <7>

R8C5 can only be <9>

R8C6 can only be <5>

R5C8 is the only square in row 5 that can be <7>

R5C9 is the only square in row 5 that can be <4>

R3C3 is the only square in column 3 that can be <7>

Squares R9C5 and R9C6 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C9 - removing <6> from <568> leaving <58>

Squares R1C5<167>, R4C5<16> and R9C5<67> in column 5 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <167>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C5 - removing <16> from <1468> leaving <48>

Squares R1C1 and R1C9 in row 1 and R9C1 and R9C9 in row 9 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 1 and 9 can be removed.

R5C1 - removing <5> from <1589> leaving <189>

Squares R4C1 and R4C9 in row 4 and R9C1 and R9C9 in row 9 form a Simple X-Wing pattern on possibility <8>. All other instances of this possibility in columns 1 and 9 can be removed.

R5C1 - removing <8> from <189> leaving <19>

Squares R9C5, R9C6, R1C5 and R1C6 form a Type-4 Unique Rectangle on <67>.

R1C5 - removing <6> from <167> leaving <17>

R1C6 - removing <6> from <679> leaving <79>

Squares R9C9 (XY), R1C9 (XZ) and R7C7 (YZ) form an XY-Wing pattern on <6>. All squares that are buddies of both the XZ and YZ squares cannot be <6>.

R2C7 - removing <6> from <69> leaving <9>

R3C8 can only be <4>

R3C5 can only be <8>

R3C2 can only be <9>

R2C5 can only be <4>

R1C6 is the only square in row 1 that can be <9>

R1C5 is the only square in row 1 that can be <7>

R9C5 can only be <6>

R9C6 can only be <7>

R4C5 can only be <1>

R5C1 is the only square in row 5 that can be <9>

R4C1 can only be <8>

R4C9 can only be <6>

R9C1 can only be <5>

R5C2 can only be <5>

R4C8 can only be <9>

R1C9 can only be <5>

R5C7 can only be <8>

R5C3 can only be <1>

R2C2 can only be <8>

R7C7 can only be <6>

R7C8 can only be <5>

R7C3 can only be <8>

R2C8 can only be <6>

R9C9 can only be <8>

R1C1 can only be <1>

R1C4 can only be <6>

R5C4 can only be <2>

R2C6 can only be <2>

R2C3 can only be <5>

R2C4 can only be <1>

R5C6 can only be <6>



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