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Daily Sudoku Answer 



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Nov 18 - Super Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R7C6 can only be <3>

R9C9 can only be <6>

R9C1 can only be <7>

R3C8 is the only square in row 3 that can be <4>

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

R5C3 is the only square in row 5 that can be <4>

R6C4 is the only square in row 6 that can be <2>

R3C5 is the only square in row 3 that can be <2>

R6C9 is the only square in row 6 that can be <4>

R6C7 is the only square in row 6 that can be <1>

R7C5 is the only square in row 7 that can be <4>

R8C1 is the only square in row 8 that can be <4>

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

R2C9 is the only square in row 2 that can be <1>

R9C8 is the only square in row 9 that can be <2>

R9C5 is the only square in row 9 that can be <9>

Squares R4C6 and R4C9 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R4C1 - removing <8> from <689> leaving <69>

R4C3 - removing <7> from <3567> leaving <356>

R4C7 - removing <8> from <3589> leaving <359>

R4C8 - removing <78> from <356789> leaving <3569>

R6C1 is the only square in column 1 that can be <8>

Squares R9C2 and R9C3 in block 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R7C2 - removing <5> from <568> leaving <68>

R8C2 - removing <5> from <568> leaving <68>

Squares R7C2 and R8C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C2 - removing <6> from <1679> leaving <179>

R5C2 - removing <6> from <367> leaving <37>

R5C8 is the only square in row 5 that can be <6>

Squares R1C1 and R4C1 in column 1 and R1C7 and R4C7 in column 7 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in rows 1 and 4 can be removed.

R1C2 - removing <9> from <179> leaving <17>

R1C8 - removing <9> from <3789> leaving <378>

R4C8 - removing <9> from <359> leaving <35>

Squares R1C9 and R5C5 form a remote naked pair. <78> can be removed from any square that is common to their groups.

R1C5 - removing <78> from <5678> leaving <56>

Intersection of row 1 with block 3. The values <38> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain these values.

R2C8 - removing <8> from <789> leaving <79>

Squares R2C3 (XY), R1C1 (XZ) and R2C8 (YZ) form an XY-Wing pattern on <9>. All squares that are buddies of both the XZ and YZ squares cannot be <9>.

R1C7 - removing <9> from <389> leaving <38>

R1C1 is the only square in row 1 that can be <9>

R4C1 can only be <6>

R3C6 is the only square in row 3 that can be <9>

R2C8 is the only square in row 2 that can be <9>

R4C7 is the only square in row 4 that can be <9>

R6C2 is the only square in row 6 that can be <9>

R9C2 is the only square in column 2 that can be <5>

R9C3 can only be <3>

R4C3 can only be <5>

R4C8 can only be <3>

R6C3 can only be <7>

R5C7 can only be <8>

R5C5 can only be <7>

R1C7 can only be <3>

R8C7 can only be <5>

R4C9 can only be <7>

R6C8 can only be <5>

R2C3 can only be <6>

R5C2 can only be <3>

R7C8 can only be <8>

R7C2 can only be <6>

R1C8 can only be <7>

R1C2 can only be <1>

R1C9 can only be <8>

R4C6 can only be <8>

R2C5 can only be <8>

R8C5 can only be <6>

R7C4 can only be <5>

R8C2 can only be <8>

R8C4 can only be <7>

R1C5 can only be <5>

R1C4 can only be <6>

R3C2 can only be <7>

R2C6 can only be <7>

R3C4 can only be <1>



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