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Sudoku Solution Path

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R4C7 can only be <8>
R2C8 is the only square in row 2 that can be <9>
R4C5 is the only square in row 4 that can be <9>
R6C4 is the only square in row 6 that can be <3>
R7C3 is the only square in row 7 that can be <9>
R1C5 is the only square in block 2 that can be <8>
Squares R3C4 and R3C6 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C2 - removing <12> from <12567> leaving <567>
   R3C3 - removing <12> from <1256> leaving <56>
   R3C7 - removing <1> from <1467> leaving <467>
   R3C8 - removing <2> from <247> leaving <47>
Squares R3C6 and R4C6 in column 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R6C6 - removing <1> from <146> leaving <46>
   R7C6 - removing <1> from <168> leaving <68>
Intersection of block 8 with row 7. The value <8> only appears in one or more of squares R7C4, R7C5 and R7C6 of block 8. These squares are the ones that intersect with row 7. Thus, the other (non-intersecting) squares of row 7 cannot contain this value.
   R7C8 - removing <8> from <378> leaving <37>
Intersection of block 4 with column 3. The value <1> only appears in one or more of squares R4C3, R5C3 and R6C3 of block 4. These squares are the ones that intersect with column 3. Thus, the other (non-intersecting) squares of column 3 cannot contain this value.
   R2C3 - removing <1> from <128> leaving <28>
   R8C3 - removing <1> from <1268> leaving <268>
Squares R3C3<56>, R4C3<15> and R6C3<16> in column 3 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <156>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R8C3 - removing <6> from <268> leaving <28>
Squares R3C4, R3C6, R4C4 and R4C6 form a Type-1 Unique Rectangle on <12>.
   R4C4 - removing <12> from <125> leaving <5>
R4C3 can only be <1>
R5C4 can only be <8>
R7C4 can only be <1>
R3C4 can only be <2>
R9C5 can only be <6>
R5C5 can only be <7>
R7C6 can only be <8>
R3C6 can only be <1>
R4C6 can only be <2>
R6C3 can only be <6>
R5C9 can only be <4>
R6C5 can only be <1>
R5C6 can only be <6>
R6C7 can only be <7>
R6C6 can only be <4>
R3C3 can only be <5>
R5C1 can only be <5>
R7C8 is the only square in row 7 that can be <7>
R3C8 can only be <4>
R3C7 can only be <6>
R3C2 can only be <7>
R7C7 can only be <3>
R7C2 can only be <6>
R2C7 can only be <1>
R8C7 can only be <4>
R1C9 can only be <2>
R1C8 can only be <3>
R2C9 can only be <7>
R9C9 can only be <1>
R9C1 can only be <8>
R8C9 can only be <6>
R1C2 can only be <1>
R9C8 can only be <2>
R2C1 can only be <3>
R8C3 can only be <2>
R9C2 can only be <5>
R8C8 can only be <8>
R1C1 can only be <6>
R2C2 can only be <2>
R8C1 can only be <1>
R2C3 can only be <8>
R8C2 can only be <3>


 

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