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Sudoku Solution Path

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R9C6 can only be <6>
R6C5 is the only square in row 6 that can be <3>
R8C5 is the only square in row 8 that can be <5>
R4C6 is the only square in row 4 that can be <5>
R5C6 can only be <4>
R6C6 can only be <2>
R1C6 can only be <8>
R2C5 can only be <6>
R3C5 can only be <9>
R1C4 can only be <2>
R1C8 is the only square in row 1 that can be <9>
R4C5 is the only square in row 4 that can be <8>
R5C4 is the only square in row 5 that can be <9>
R6C1 is the only square in row 6 that can be <4>
R7C2 is the only square in row 7 that can be <5>
R8C9 is the only square in row 8 that can be <9>
R8C3 is the only square in row 8 that can be <2>
R3C2 is the only square in row 3 that can be <2>
R7C9 is the only square in row 7 that can be <2>
R9C7 is the only square in row 9 that can be <4>
R4C4 is the only square in column 4 that can be <6>
R3C9 is the only square in column 9 that can be <6>
R3C3 is the only square in row 3 that can be <4>
R2C9 is the only square in row 2 that can be <4>
Squares R9C2 and R9C4 in row 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R9C3 - removing <17> from <1378> leaving <38>
   R9C8 - removing <1> from <138> leaving <38>
Squares R4C9 and R6C9 in block 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R5C7 - removing <17> from <1357> leaving <35>
   R5C8 - removing <1> from <135> leaving <35>
Intersection of column 1 with block 7. The value <6> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R7C3 - removing <6> from <13678> leaving <1378>
Squares R5C5 and R9C2 form a remote locked pair. <17> can be removed from any square that is common to their groups.
   R5C2 - removing <17> from <167> leaving <6>
R1C3 is the only square in row 1 that can be <6>
Squares R5C3 and R7C3 in column 3 and R5C5 and R7C5 in column 5 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in rows 5 and 7 can be removed.
   R7C1 - removing <1> from <13678> leaving <3678>
   R7C7 - removing <1> from <1368> leaving <368>
   R7C8 - removing <1> from <138> leaving <38>
R3C8 is the only square in column 8 that can be <1>
R3C1 can only be <8>
R1C7 can only be <7>
R1C2 can only be <1>
R2C7 can only be <8>
R3C7 can only be <5>
R5C7 can only be <3>
R5C8 can only be <5>
R7C7 can only be <6>
R8C7 can only be <1>
R8C1 can only be <6>
R9C2 can only be <7>
R9C4 can only be <1>
R7C1 can only be <3>
R6C4 can only be <7>
R7C5 can only be <7>
R6C9 can only be <1>
R5C5 can only be <1>
R4C9 can only be <7>
R7C8 can only be <8>
R2C1 can only be <7>
R9C3 can only be <8>
R7C3 can only be <1>
R9C8 can only be <3>
R2C3 can only be <3>
R4C1 can only be <1>
R5C3 can only be <7>


 

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