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Daily Sudoku Answer 



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Nov 23 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s115604



Reasoning 



R4C6 can only be <3>

R2C6 can only be <2>

R2C4 can only be <5>

R4C4 can only be <9>

R1C5 can only be <3>

R5C4 can only be <8>

R5C6 can only be <6>

R6C6 can only be <7>

R6C4 can only be <2>

R8C6 can only be <8>

R3C5 can only be <7>

R9C5 can only be <9>

R8C4 can only be <7>

R9C9 can only be <1>

R7C5 can only be <2>

R5C9 can only be <3>

R4C8 is the only square in row 4 that can be <4>

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

R2C3 is the only square in row 2 that can be <6>

R8C3 is the only square in row 8 that can be <2>

Squares R7C9<49>, R8C7<34> and R8C8<39> in block 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <349>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C7 - removing <34> from <34678> leaving <678>

R7C8 - removing <39> from <389> leaving <8>

Squares R3C2, R3C3 and R3C8 in row 3 form a simple naked triplet. These 3 squares all contain the 3 possibilities <135>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R3C1 - removing <5> from <258> leaving <28>

R3C7 - removing <135> from <13458> leaving <48>

Intersection of row 7 with block 7. The value <3> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R8C2 - removing <3> from <349> leaving <49>

Squares R5C1<59>, R7C1<69> and R9C1<56> in column 1 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <569>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C1 - removing <59> from <2589> leaving <28>

Squares R2C2 and R2C8 in row 2 and R8C2 and R8C8 in row 8 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 2 and 8 can be removed.

R7C2 - removing <9> from <349> leaving <34>

Squares R1C3 and R1C7 in row 1, R5C1, R5C3 and R5C7 in row 5 and R9C1 and R9C3 in row 9 form a Swordfish pattern on possibility <5>. All other instances of this possibility in columns 1, 3 and 7 can be removed.

R3C3 - removing <5> from <135> leaving <13>

Squares R2C8 (XYZ), R2C7 (XZ) and R8C8 (YZ) form an XYZ-Wing pattern on <3>. All squares that are buddies of all three squares cannot be <3>.

R3C8 - removing <3> from <135> leaving <15>

Squares R3C8 and R6C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C8 - removing <1> from <139> leaving <39>

Intersection of row 3 with block 1. The value <3> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.

R2C2 - removing <3> from <139> leaving <19>

Squares R2C2 (XY), R4C2 (XZ) and R1C3 (YZ) form an XY-Wing pattern on <5>. All squares that are buddies of both the XZ and YZ squares cannot be <5>.

R5C3 - removing <5> from <159> leaving <19>

R3C2 - removing <5> from <135> leaving <13>

R3C8 is the only square in row 3 that can be <5>

R6C8 can only be <1>

R1C7 can only be <8>

R6C5 can only be <5>

R5C7 can only be <5>

R1C1 can only be <2>

R3C7 can only be <4>

R3C9 can only be <2>

R8C7 can only be <3>

R3C1 can only be <8>

R1C9 can only be <9>

R5C1 can only be <9>

R4C5 can only be <1>

R8C8 can only be <9>

R2C7 can only be <1>

R8C2 can only be <4>

R2C8 can only be <3>

R7C9 can only be <4>

R1C3 can only be <5>

R2C2 can only be <9>

R4C2 can only be <5>

R5C3 can only be <1>

R7C1 can only be <6>

R3C3 can only be <3>

R7C7 can only be <7>

R9C1 can only be <5>

R9C7 can only be <6>

R7C2 can only be <3>

R9C3 can only be <7>

R3C2 can only be <1>

R7C3 can only be <9>



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