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Daily Sudoku Answer 



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Mar 29 - Super Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R5C5 can only be <4>

R6C1 can only be <4>

R1C6 is the only square in row 1 that can be <1>

R2C3 is the only square in row 2 that can be <4>

R3C8 is the only square in row 3 that can be <2>

R4C7 is the only square in row 4 that can be <1>

R5C9 is the only square in row 5 that can be <2>

R6C9 can only be <8>

R6C7 can only be <5>

R6C3 can only be <2>

R5C8 can only be <6>

R5C1 can only be <9>

R8C8 can only be <8>

R4C9 can only be <9>

R2C8 can only be <5>

R7C8 can only be <3>

R5C2 can only be <5>

R7C2 is the only square in row 7 that can be <1>

R9C6 is the only square in row 9 that can be <3>

R8C3 is the only square in column 3 that can be <5>

Squares R1C4 and R9C4 in column 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 column.

R3C4 - removing <7> from <479> leaving <49>

R7C4 - removing <7> from <479> leaving <49>

Squares R1C1 and R1C9 in row 1 and R9C1 and R9C9 in row 9 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 1 and 9 can be removed.

R4C1 - removing <6> from <67> leaving <7>

R4C3 can only be <6>

Squares R1C4 and R9C4 in column 4 and R1C9 and R9C9 in column 9 form a Simple X-Wing pattern on possibility <7>. All other instances of this possibility in rows 1 and 9 can be removed.

R1C5 - removing <7> from <578> leaving <58>

R9C5 - removing <7> from <578> leaving <58>

Squares R1C5 and R9C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C5 - removing <8> from <789> leaving <79>

R2C7 is the only square in row 2 that can be <8>

Squares R1C1 (XY), R1C9 (XZ) and R3C3 (YZ) form an XY-Wing pattern on <7>. All squares that are buddies of both the XZ and YZ squares cannot be <7>.

R3C7 - removing <7> from <67> leaving <6>

R1C9 can only be <7>

R1C4 can only be <5>

R9C9 can only be <6>

R9C1 can only be <8>

R1C5 can only be <8>

R9C4 can only be <7>

R1C1 can only be <6>

R9C5 can only be <5>

R3C6 can only be <4>

R3C4 can only be <9>

R7C6 can only be <8>

R7C3 can only be <7>

R8C5 can only be <9>

R3C2 can only be <7>

R7C4 can only be <4>

R2C5 can only be <7>

R7C7 can only be <9>

R3C3 can only be <8>

R8C2 can only be <6>

R8C7 can only be <7>

R2C2 can only be <9>



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