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Sudoku Solution Path

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R2C5 can only be <1>
R1C7 is the only square in row 1 that can be <9>
R2C2 is the only square in row 2 that can be <9>
R2C3 is the only square in row 2 that can be <6>
R3C2 is the only square in row 3 that can be <4>
R4C1 is the only square in row 4 that can be <7>
R6C9 is the only square in row 6 that can be <4>
R7C7 is the only square in row 7 that can be <4>
R7C1 is the only square in column 1 that can be <9>
R6C1 is the only square in column 1 that can be <6>
R4C8 is the only square in row 4 that can be <6>
R7C2 is the only square in row 7 that can be <6>
R8C8 is the only square in block 9 that can be <9>
Squares R7C3 and R9C3 in column 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R8C3 - removing <18> from <1358> leaving <35>
Squares R7C3 and R9C3 in block 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R8C2 - removing <18> from <1358> leaving <35>
Intersection of row 3 with block 1. The value <3> 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.
   R1C3 - removing <3> from <357> leaving <57>
Intersection of row 7 with block 9. The value <2> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R8C7 - removing <2> from <126> leaving <16>
R2C7 is the only square in column 7 that can be <2>
R3C7 is the only square in column 7 that can be <5>
R3C1 can only be <3>
R2C8 can only be <7>
R3C3 can only be <7>
R5C1 can only be <5>
R1C3 can only be <5>
R5C8 can only be <2>
R5C9 can only be <9>
R4C9 can only be <1>
R8C3 can only be <3>
R4C2 can only be <3>
R3C9 can only be <8>
R6C8 can only be <5>
R6C4 can only be <8>
R8C2 can only be <5>
R3C8 can only be <1>
R7C9 can only be <2>
R4C6 can only be <5>
R5C2 can only be <8>
R4C4 can only be <9>
R2C6 can only be <4>
R5C5 can only be <3>
R6C2 can only be <1>
R1C5 can only be <8>
R6C6 can only be <2>
R1C4 can only be <7>
R8C4 can only be <6>
R8C7 can only be <1>
R8C6 can only be <8>
R9C7 can only be <6>
R7C8 can only be <8>
R1C6 can only be <3>
R8C5 can only be <2>
R9C5 can only be <9>
R2C4 can only be <5>
R9C4 can only be <4>
R7C3 can only be <1>
R9C6 can only be <1>
R9C3 can only be <8>


 

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