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Daily Sudoku Answer 



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Jan 27 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s082086



Reasoning 



R1C8 can only be <8>

R2C5 can only be <1>

R8C1 can only be <8>

R2C9 can only be <6>

R3C6 can only be <4>

R2C1 can only be <4>

R1C7 can only be <1>

R3C7 can only be <7>

R7C1 can only be <1>

R3C9 can only be <9>

R3C1 can only be <5>

R3C3 can only be <1>

R3C4 can only be <8>

R1C2 can only be <9>

R1C3 can only be <6>

R5C1 is the only square in row 5 that can be <6>

R6C9 is the only square in row 6 that can be <1>

R7C6 is the only square in row 7 that can be <9>

R9C6 is the only square in row 9 that can be <1>

R6C6 is the only square in column 6 that can be <6>

R7C9 is the only square in column 9 that can be <2>

Squares R4C1 and R4C6 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C4 - removing <23> from <2357> leaving <57>

R4C7 - removing <3> from <348> leaving <48>

R4C9 - removing <3> from <357> leaving <57>

Squares R4C4 and R4C9 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C3 - removing <5> from <458> leaving <48>

Squares R9C2<45>, R9C3<457> and R9C8<47> in row 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <457>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C4 - removing <7> from <2367> leaving <236>

R9C5 - removing <7> from <237> leaving <23>

R9C7 - removing <4> from <346> leaving <36>

Squares R5C5 and R5C9 in row 5 and R8C5 and R8C9 in row 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in columns 5 and 9 can be removed.

R1C5 - removing <3> from <235> leaving <25>

R9C5 - removing <3> from <23> leaving <2>

R1C5 can only be <5>

Squares R4C3 and R4C7 in row 4 and R7C3 and R7C7 in row 7 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 3 and 7 can be removed.

R9C3 - removing <4> from <457> leaving <57>

Squares R5C8 (XY), R5C2 (XZ) and R4C9 (YZ) form an XY-Wing pattern on <5>. All squares that are buddies of both the XZ and YZ squares cannot be <5>.

R5C9 - removing <5> from <357> leaving <37>

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

R9C2 can only be <4>

R6C3 can only be <8>

R6C7 can only be <3>

R4C3 can only be <4>

R6C1 can only be <2>

R9C7 can only be <6>

R5C9 can only be <7>

R9C8 can only be <7>

R7C3 can only be <7>

R9C4 can only be <3>

R7C7 can only be <4>

R9C3 can only be <5>

R5C8 can only be <4>

R8C9 can only be <3>

R4C7 can only be <8>

R5C5 can only be <3>

R4C9 can only be <5>

R6C4 can only be <5>

R4C1 can only be <3>

R4C4 can only be <7>

R7C4 can only be <6>

R8C5 can only be <7>

R1C4 can only be <2>

R1C6 can only be <3>

R4C6 can only be <2>



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