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Sudoku Solution Path

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R4C2 can only be <1>
R5C2 can only be <3>
R1C9 is the only square in row 1 that can be <5>
R2C3 is the only square in row 2 that can be <6>
R3C5 is the only square in row 3 that can be <9>
R5C3 is the only square in row 5 that can be <5>
R7C1 is the only square in row 7 that can be <5>
R7C2 is the only square in row 7 that can be <2>
R3C2 can only be <4>
R9C2 can only be <6>
R7C8 is the only square in row 7 that can be <6>
R7C7 is the only square in row 7 that can be <9>
R7C4 is the only square in row 7 that can be <7>
R9C6 is the only square in row 9 that can be <5>
R9C7 is the only square in row 9 that can be <7>
R5C8 is the only square in row 5 that can be <7>
Intersection of row 8 with block 9. The value <3> only appears in one or more of squares R8C7, R8C8 and R8C9 of row 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R9C9 - removing <3> from <1348> leaving <148>
Intersection of column 6 with block 5. The values <24> only appears in one or more of squares R4C6, R5C6 and R6C6 of column 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.
   R5C5 - removing <4> from <148> leaving <18>
Squares R5C4 and R5C5 in row 5 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 row.
   R5C7 - removing <18> from <1248> leaving <24>
Squares R5C4 and R5C5 in block 5 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.
   R4C4 - removing <8> from <689> leaving <69>
   R6C4 - removing <18> from <1389> leaving <39>
Intersection of column 9 with block 9. The value <4> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. 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 <4> from <134> leaving <13>
Squares R2C7 and R8C7 in column 7 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 column.
   R1C7 - removing <13> from <12348> leaving <248>
   R6C7 - removing <1> from <148> leaving <48>
R6C8 is the only square in row 6 that can be <1>
R3C8 can only be <8>
R1C8 can only be <4>
R1C7 can only be <2>
R5C7 can only be <4>
R5C6 can only be <2>
R6C7 can only be <8>
R6C1 can only be <9>
R4C9 can only be <2>
R4C6 can only be <6>
R6C4 can only be <3>
R9C1 can only be <1>
R4C3 can only be <8>
R6C6 can only be <4>
R9C4 can only be <8>
R2C1 can only be <3>
R8C3 can only be <4>
R9C9 can only be <4>
R5C4 can only be <1>
R7C5 can only be <4>
R9C3 can only be <9>
R9C5 can only be <3>
R7C9 can only be <8>
R2C7 can only be <1>
R1C1 can only be <8>
R3C1 can only be <2>
R8C7 can only be <3>
R3C9 can only be <3>
R3C6 can only be <7>
R8C9 can only be <1>
R4C4 can only be <9>
R5C5 can only be <8>
R1C4 can only be <6>
R1C5 can only be <1>
R1C3 can only be <7>
R3C3 can only be <1>
R1C6 can only be <3>

 

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