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Daily Sudoku Answer 



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Aug 09 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s059921



Reasoning 



R2C4 can only be <1>

R9C9 can only be <7>

R2C7 can only be <8>

R2C6 can only be <2>

R2C3 can only be <9>

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

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

R4C8 is the only square in row 4 that can be <8>

R7C7 is the only square in row 7 that can be <5>

Squares R4C7<69>, R5C9<26> and R6C8<29> in block 6 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <269>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R5C7 - removing <69> from <3679> leaving <37>

R6C7 - removing <9> from <379> leaving <37>

Squares R1C1 and R5C1 in column 1 and R1C9 and R5C9 in column 9 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in rows 1 and 5 can be removed.

R5C3 - removing <2> from <236> leaving <36>

Squares R6C2 and R7C2 in column 2 and R6C8 and R7C8 in column 8 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in rows 6 and 7 can be removed.

R7C4 - removing <9> from <4679> leaving <467>

R6C5 - removing <9> from <579> leaving <57>

R7C5 - removing <9> from <1679> leaving <167>

Squares R7C8 (XY), R3C8 (XZ) and R7C2 (YZ) form an XY-Wing pattern on <2>. All squares that are buddies of both the XZ and YZ squares cannot be <2>.

R3C2 - removing <2> from <25> leaving <5>

Squares R6C2 and R6C8 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R6C3 - removing <2> from <235> leaving <35>

Squares R3C3 (XY), R7C3 (XZ) and R3C6 (YZ) form an XY-Wing pattern on <7>. All squares that are buddies of both the XZ and YZ squares cannot be <7>.

R7C6 - removing <7> from <147> leaving <14>

Squares R8C3 (XY), R8C4 (XZ) and R9C1 (YZ) form an XY-Wing pattern on <9>. All squares that are buddies of both the XZ and YZ squares cannot be <9>.

R9C5 - removing <9> from <89> leaving <8>

R9C1 can only be <9>

R1C5 can only be <6>

R1C9 can only be <2>

R3C4 can only be <7>

R1C1 can only be <8>

R5C9 can only be <6>

R3C8 can only be <1>

R3C6 can only be <8>

R8C4 can only be <9>

R3C3 can only be <2>

R3C7 can only be <6>

R7C8 can only be <9>

R5C3 can only be <3>

R4C7 can only be <9>

R7C2 can only be <2>

R6C8 can only be <2>

R8C7 can only be <1>

R5C4 can only be <4>

R8C6 can only be <7>

R5C1 can only be <2>

R7C3 can only be <7>

R4C5 can only be <5>

R6C2 can only be <9>

R5C7 can only be <7>

R6C3 can only be <5>

R7C4 can only be <6>

R5C6 can only be <1>

R6C7 can only be <3>

R6C5 can only be <7>

R4C3 can only be <6>

R7C5 can only be <1>

R8C3 can only be <8>

R7C6 can only be <4>

R5C5 can only be <9>



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