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Sudoku Solution Path

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R2C8 can only be <2>
R2C2 can only be <3>
R2C9 can only be <5>
R2C1 can only be <4>
R2C5 can only be <7>
R1C8 is the only square in row 1 that can be <1>
R3C7 is the only square in row 3 that can be <4>
R5C6 is the only square in row 5 that can be <4>
R6C7 is the only square in row 6 that can be <3>
R7C3 is the only square in row 7 that can be <4>
R8C5 is the only square in row 8 that can be <3>
R3C6 is the only square in row 3 that can be <3>
R9C3 is the only square in row 9 that can be <3>
R9C4 is the only square in row 9 that can be <1>
R7C1 is the only square in row 7 that can be <1>
R9C7 is the only square in row 9 that can be <5>
R9C6 is the only square in row 9 that can be <7>
R5C2 is the only square in column 2 that can be <7>
R7C5 is the only square in column 5 that can be <9>
Squares R7C4 and R7C6 in row 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R7C7 - removing <8> from <278> leaving <27>
   R7C9 - removing <68> from <2678> leaving <27>
Squares R7C7 and R7C9 in block 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R8C9 - removing <2> from <2689> leaving <689>
Intersection of column 2 with block 7. The value <8> only appears in one or more of squares R7C2, R8C2 and R9C2 of column 2. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R8C1 - removing <8> from <289> leaving <29>
Intersection of column 8 with block 9. The value <8> only appears in one or more of squares R7C8, R8C8 and R9C8 of column 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R8C9 - removing <8> from <689> leaving <69>
Squares R1C3 and R1C4 in row 1 and R5C3 and R5C4 in row 5 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 3 and 4 can be removed.
   R3C3 - removing <5> from <2569> leaving <269>
   R3C4 - removing <5> from <2568> leaving <268>
   R6C3 - removing <5> from <125> leaving <12>
Squares R7C4, R7C6, R1C4 and R1C6 form a Type-1 Unique Rectangle on <68>.
   R1C4 - removing <68> from <2568> leaving <25>
Squares R9C2, R9C8, R8C2 and R8C8 form a Type-4 Unique Rectangle on <89>.
   R8C2 - removing <9> from <289> leaving <28>
   R8C8 - removing <9> from <689> leaving <68>
Squares R5C7 (XY), R6C9 (XZ) and R1C7 (YZ) form an XY-Wing pattern on <8>. All squares that are buddies of both the XZ and YZ squares cannot be <8>.
   R4C7 - removing <8> from <789> leaving <79>
   R3C9 - removing <8> from <89> leaving <9>
R8C9 can only be <6>
R1C7 can only be <8>
R8C8 can only be <8>
R1C6 can only be <6>
R8C2 can only be <2>
R9C8 can only be <9>
R9C2 can only be <8>
R5C8 can only be <6>
R7C6 can only be <8>
R3C5 can only be <5>
R3C1 can only be <2>
R6C5 can only be <1>
R1C4 can only be <2>
R5C4 can only be <5>
R6C3 can only be <2>
R4C5 can only be <6>
R7C4 can only be <6>
R8C1 can only be <9>
R1C2 can only be <9>
R1C3 can only be <5>
R3C4 can only be <8>
R3C3 can only be <6>
R6C9 can only be <8>
R5C3 can only be <9>
R6C1 can only be <5>
R4C9 can only be <7>
R4C1 can only be <8>
R4C7 can only be <9>
R7C9 can only be <2>
R5C7 can only be <2>
R4C3 can only be <1>
R7C7 can only be <7>


 

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