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Sudoku Solution Path

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R2C5 is the only square in row 2 that can be <8>
R2C9 is the only square in row 2 that can be <6>
R3C2 is the only square in row 3 that can be <5>
R4C1 is the only square in row 4 that can be <6>
R6C9 is the only square in row 6 that can be <8>
R8C7 is the only square in row 8 that can be <8>
R7C4 is the only square in row 7 that can be <8>
R7C5 is the only square in row 7 that can be <5>
R5C9 is the only square in row 5 that can be <5>
R4C4 is the only square in row 4 that can be <5>
R8C1 is the only square in row 8 that can be <5>
R9C6 is the only square in row 9 that can be <6>
R3C5 is the only square in row 3 that can be <6>
R7C8 is the only square in row 7 that can be <6>
Squares R7C2 and R7C6 in row 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R7C3 - removing <79> from <1479> leaving <14>
Squares R5C7 and R7C7 in column 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R3C7 - removing <4> from <234> leaving <23>
Squares R2C7 and R3C7 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R1C9 - removing <3> from <347> leaving <47>
   R3C8 - removing <3> from <347> leaving <47>
Intersection of row 1 with block 2. The value <3> only appears in one or more of squares R1C4, R1C5 and R1C6 of row 1. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.
   R3C4 - removing <3> from <123> leaving <12>
   R3C6 - removing <3> from <134> leaving <14>
Intersection of row 5 with block 4. The value <9> only appears in one or more of squares R5C1, R5C2 and R5C3 of row 5. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
   R6C1 - removing <9> from <12479> leaving <1247>
   R6C2 - removing <9> from <279> leaving <27>
R7C2 is the only square in column 2 that can be <9>
R7C6 can only be <7>
R9C1 can only be <4>
R8C5 can only be <3>
R8C9 can only be <1>
R9C4 can only be <9>
R8C3 can only be <7>
R7C7 can only be <4>
R9C9 can only be <3>
R7C3 can only be <1>
R5C7 can only be <1>
R3C3 can only be <3>
R3C7 can only be <2>
R2C3 can only be <9>
R3C4 can only be <1>
R2C7 can only be <3>
R2C1 can only be <2>
R5C3 can only be <4>
R3C6 can only be <4>
R3C8 can only be <7>
R1C6 can only be <3>
R1C9 can only be <4>
R5C5 can only be <7>
R5C1 can only be <9>
R1C4 can only be <2>
R4C6 can only be <1>
R4C9 can only be <7>
R1C1 can only be <7>
R6C6 can only be <9>
R4C2 can only be <2>
R6C1 can only be <1>
R6C4 can only be <3>
R4C5 can only be <4>
R6C2 can only be <7>
R4C8 can only be <3>
R6C5 can only be <2>
R6C8 can only be <4>

 

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