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Common Answers

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Sudoku Solution Path

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R6C8 can only be <5>
R8C6 can only be <2>
R9C1 can only be <6>
R9C9 can only be <7>
R9C2 can only be <5>
R9C8 can only be <2>
R7C8 can only be <3>
R8C9 can only be <1>
R1C2 is the only square in row 1 that can be <8>
R2C2 is the only square in row 2 that can be <2>
Squares R1C9 and R2C9 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R1C8 - removing <4> from <49> leaving <9>
   R2C8 - removing <4> from <14679> leaving <1679>
Squares R6C2 and R6C5 in row 6 and R7C2 and R7C5 in row 7 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 2 and 5 can be removed.
   R5C2 - removing <9> from <1469> leaving <146>
   R5C5 - removing <9> from <13689> leaving <1368>
   R8C2 - removing <9> from <3479> leaving <347>
   R8C5 - removing <9> from <579> leaving <57>
Squares R1C1, R1C9, R2C1 and R2C9 form a Type-1 Unique Rectangle on <34>.
   R2C1 - removing <34> from <349> leaving <9>
Squares R6C5 (XY), R3C5 (XZ) and R5C4 (YZ) form an XY-Wing pattern on <3>. All squares that are buddies of both the XZ and YZ squares cannot be <3>.
   R5C5 - removing <3> from <1368> leaving <168>
   R2C4 - removing <3> from <35> leaving <5>
R8C4 can only be <9>
R8C3 can only be <4>
R5C4 can only be <3>
R7C5 can only be <7>
R7C2 can only be <9>
R8C5 can only be <5>
R8C1 can only be <3>
R2C3 can only be <6>
R2C7 can only be <7>
R5C3 can only be <9>
R3C2 can only be <3>
R2C8 can only be <1>
R5C7 can only be <8>
R2C6 can only be <8>
R3C8 can only be <6>
R3C5 can only be <1>
R8C2 can only be <7>
R1C1 can only be <4>
R6C5 can only be <9>
R8C8 can only be <8>
R6C2 can only be <1>
R5C5 can only be <6>
R5C6 can only be <1>
R8C7 can only be <6>
R4C8 can only be <4>
R1C9 can only be <3>
R2C9 can only be <4>
R2C5 can only be <3>
R4C2 can only be <6>
R5C8 can only be <7>
R5C2 can only be <4>
R4C5 can only be <8>


 

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