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Sudoku Solution Path

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R8C1 can only be <6>
R1C7 is the only square in row 1 that can be <9>
R2C2 is the only square in row 2 that can be <6>
R5C7 is the only square in row 5 that can be <3>
R5C3 is the only square in row 5 that can be <6>
R5C9 is the only square in row 5 that can be <9>
R6C3 is the only square in row 6 that can be <9>
R7C9 is the only square in row 7 that can be <2>
R8C6 is the only square in row 8 that can be <9>
Squares R4C7 and R6C7 in column 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 column.
   R3C7 - removing <18> from <1458> leaving <45>
   R7C7 - removing <1> from <1456> leaving <456>
   R9C7 - removing <18> from <14568> leaving <456>
Squares R4C7 and R6C7 in block 6 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.
   R4C8 - removing <18> from <1278> leaving <27>
   R6C8 - removing <18> from <1278> leaving <27>
Squares R6C2 and R6C8 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C5 - removing <27> from <1278> leaving <18>
Intersection of column 2 with block 4. The value <7> only appears in one or more of squares R4C2, R5C2 and R6C2 of column 2. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
   R4C3 - removing <7> from <578> leaving <58>
   R5C1 - removing <7> from <278> leaving <28>
Intersection of row 5 with block 5. The values <47> only appears in one or more of squares R5C4, R5C5 and R5C6 of row 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.
   R4C5 - removing <7> from <1278> leaving <128>
Intersection of column 9 with block 3. The value <5> only appears in one or more of squares R1C9, R2C9 and R3C9 of column 9. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R3C7 - removing <5> from <45> leaving <4>
R1C5 is the only square in row 1 that can be <4>
R1C2 is the only square in row 1 that can be <2>
R6C2 can only be <7>
R6C8 can only be <2>
R4C2 can only be <5>
R4C8 can only be <7>
R4C3 can only be <8>
R9C2 can only be <4>
R4C7 can only be <1>
R1C3 can only be <3>
R5C1 can only be <2>
R4C5 can only be <2>
R6C7 can only be <8>
R6C5 can only be <1>
R8C2 can only be <3>
R1C8 can only be <8>
R9C8 can only be <1>
R9C3 can only be <5>
R2C8 can only be <3>
R8C8 can only be <4>
R8C9 can only be <8>
R8C4 can only be <1>
R9C7 can only be <6>
R3C3 can only be <7>
R7C1 can only be <7>
R9C5 can only be <8>
R7C7 can only be <5>
R7C3 can only be <1>
R7C6 can only be <4>
R7C4 can only be <3>
R2C4 can only be <8>
R3C5 can only be <3>
R5C5 can only be <7>
R2C1 can only be <5>
R5C4 can only be <4>
R3C6 can only be <1>
R3C4 can only be <2>
R7C5 can only be <6>
R3C9 can only be <5>
R2C6 can only be <7>
R3C1 can only be <8>
R2C9 can only be <1>
R5C6 can only be <8>


 

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