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Sudoku Solution Path

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R5C5 can only be <2>
R1C8 is the only square in row 1 that can be <5>
R2C6 is the only square in row 2 that can be <6>
R4C9 is the only square in row 4 that can be <6>
R5C1 is the only square in row 5 that can be <5>
R5C3 is the only square in row 5 that can be <6>
R6C9 is the only square in row 6 that can be <2>
R2C2 is the only square in row 2 that can be <2>
R1C7 is the only square in row 1 that can be <2>
R2C1 is the only square in row 2 that can be <7>
R3C5 is the only square in row 3 that can be <7>
R6C2 is the only square in row 6 that can be <7>
R7C3 is the only square in row 7 that can be <7>
R8C4 is the only square in row 8 that can be <2>
R9C2 is the only square in row 9 that can be <5>
R8C9 is the only square in row 8 that can be <5>
R9C7 is the only square in row 9 that can be <6>
R9C6 is the only square in row 9 that can be <7>
R7C7 is the only square in column 7 that can be <8>
R2C9 is the only square in column 9 that can be <8>
Squares R5C7 and R5C9 in block 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R4C8 - removing <3> from <389> leaving <89>
Intersection of row 1 with block 1. The value <3> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R3C1 - removing <3> from <1349> leaving <149>
   R3C3 - removing <3> from <349> leaving <49>
Intersection of row 3 with block 1. The value <9> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R1C2 - removing <9> from <139> leaving <13>
   R1C3 - removing <9> from <349> leaving <34>
R3C3 is the only square in column 3 that can be <9>
Squares R2C4 and R2C8 in row 2 and R9C4 and R9C8 in row 9 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in columns 4 and 8 can be removed.
   R1C4 - removing <1> from <148> leaving <48>
   R8C8 - removing <1> from <134> leaving <34>
Squares R1C2 and R8C2 in column 2 and R1C6 and R8C6 in column 6 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in rows 1 and 8 can be removed.
   R8C1 - removing <1> from <1349> leaving <349>
Squares R5C7, R5C9, R3C7 and R3C9 form a Type-1 Unique Rectangle on <13>.
   R3C9 - removing <13> from <134> leaving <4>
R3C1 can only be <1>
R7C9 can only be <1>
R2C8 can only be <1>
R5C9 can only be <3>
R2C4 can only be <4>
R3C7 can only be <3>
R1C2 can only be <3>
R5C7 can only be <1>
R1C3 can only be <4>
R4C2 can only be <9>
R1C4 can only be <8>
R9C3 can only be <3>
R1C5 can only be <9>
R1C6 can only be <1>
R7C5 can only be <4>
R8C6 can only be <9>
R9C4 can only be <1>
R4C8 can only be <8>
R8C2 can only be <1>
R6C1 can only be <8>
R4C1 can only be <3>
R6C8 can only be <9>
R7C1 can only be <9>
R9C5 can only be <8>
R9C8 can only be <4>
R8C1 can only be <4>
R8C8 can only be <3>


 

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