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Daily Sudoku Answer 



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Mar 23 - Super Hard
Puzzle Copyright © Kevin Stone

Share Link – www.brainbashers.com/s062781



Reasoning 



R1C5 can only be <3>

R2C2 can only be <5>

R3C6 can only be <6>

R4C3 can only be <4>

R5C1 can only be <2>

R3C9 can only be <4>

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

R3C5 is the only square in row 3 that can be <5>

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

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

R7C8 is the only square in row 7 that can be <3>

R5C7 is the only square in row 5 that can be <3>

Squares R5C6 and R6C5 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R5C5 - removing <47> from <46789> leaving <689>

Squares R4C7 and R5C9 in block 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R5C8 - removing <6> from <146> leaving <14>

Squares R2C7<168>, R2C8<168> and R3C8<18> in block 3 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <168>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R3C7 - removing <18> from <1278> leaving <27>

Squares R6C5 and R6C7 in row 6 and R9C5 and R9C7 in row 9 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 5 and 7 can be removed.

R7C5 - removing <4> from <12478> leaving <1278>

R8C5 - removing <4> from <248> leaving <28>

R8C7 - removing <4> from <4689> leaving <689>

Squares R2C3 and R2C5 in row 2, R4C5 and R4C7 in row 4 and R8C3 and R8C7 in row 8 form a Swordfish pattern on possibility <9>. All other instances of this possibility in columns 3, 5 and 7 can be removed.

R5C5 - removing <9> from <689> leaving <68>

R7C3 - removing <9> from <12689> leaving <1268>

Squares R2C3 (XY), R9C3 (XZ) and R2C5 (YZ) form an XY-Wing pattern on <1>. All squares that are buddies of both the XZ and YZ squares cannot be <1>.

R9C5 - removing <1> from <148> leaving <48>

R9C3 is the only square in row 9 that can be <1>

R6C3 can only be <7>

R6C5 can only be <4>

R1C3 can only be <2>

R5C2 can only be <1>

R6C7 can only be <1>

R9C5 can only be <8>

R5C6 can only be <7>

R5C8 can only be <4>

R9C7 can only be <4>

R5C5 can only be <6>

R8C5 can only be <2>

R7C4 can only be <1>

R1C7 can only be <7>

R3C2 can only be <7>

R3C7 can only be <2>

R5C9 can only be <9>

R4C5 can only be <9>

R7C6 can only be <4>

R5C4 can only be <8>

R7C9 can only be <6>

R4C7 can only be <6>

R3C4 can only be <9>

R7C2 can only be <2>

R7C3 can only be <8>

R8C8 can only be <8>

R8C2 can only be <4>

R7C5 can only be <7>

R8C7 can only be <9>

R3C8 can only be <1>

R3C1 can only be <8>

R2C5 can only be <1>

R2C8 can only be <6>

R2C7 can only be <8>

R7C1 can only be <9>

R2C3 can only be <9>

R8C3 can only be <6>



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