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Sudoku Solution Path

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R6C6 can only be <7>
R5C6 can only be <9>
R1C6 can only be <3>
R1C5 is the only square in row 1 that can be <9>
R8C5 can only be <7>
R2C5 can only be <6>
R9C5 can only be <1>
R9C4 can only be <2>
R3C2 is the only square in row 3 that can be <9>
R4C9 is the only square in row 4 that can be <9>
R2C4 is the only square in column 4 that can be <7>
R8C6 is the only square in column 6 that can be <5>
Intersection of row 4 with block 4. The values <45> only appears in one or more of squares R4C1, R4C2 and R4C3 of row 4. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain these values.
   R5C1 - removing <5> from <1578> leaving <178>
   R5C2 - removing <5> from <13578> leaving <1378>
   R5C3 - removing <5> from <135678> leaving <13678>
   R6C1 - removing <4> from <148> leaving <18>
Intersection of row 6 with block 6. The values <46> only appears in one or more of squares R6C7, R6C8 and R6C9 of row 6. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain these values.
   R5C7 - removing <6> from <12568> leaving <1258>
   R5C8 - removing <6> from <12568> leaving <1258>
   R5C9 - removing <6> from <56> leaving <5>
R2C9 can only be <4>
R2C6 can only be <2>
R6C9 can only be <6>
R3C6 can only be <4>
R3C3 is the only square in row 3 that can be <2>
R6C7 is the only square in row 6 that can be <4>
R9C7 is the only square in row 9 that can be <6>
R1C8 is the only square in row 1 that can be <6>
Intersection of row 3 with block 3. The values <357> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain these values.
   R1C7 - removing <7> from <178> leaving <18>
   R2C7 - removing <5> from <158> leaving <18>
Squares R1C7 and R2C7 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.
   R5C7 - removing <18> from <128> leaving <2>
R8C7 can only be <9>
R8C4 can only be <4>
R7C4 can only be <9>
Intersection of row 9 with block 7. The value <5> only appears in one or more of squares R9C1, R9C2 and R9C3 of row 9. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R7C1 - removing <5> from <12457> leaving <1247>
   R7C2 - removing <5> from <157> leaving <17>
   R7C3 - removing <5> from <1457> leaving <147>
R4C1 is the only square in column 1 that can be <5>
R4C2 can only be <8>
R4C4 can only be <6>
R6C1 can only be <1>
R4C3 can only be <4>
R5C4 can only be <8>
R5C8 can only be <1>
R5C1 can only be <7>
R6C8 can only be <8>
R5C2 can only be <3>
R1C1 can only be <8>
R5C3 can only be <6>
R1C7 can only be <1>
R8C1 can only be <2>
R1C3 can only be <7>
R2C7 can only be <8>
R8C8 can only be <3>
R7C1 can only be <4>
R8C3 can only be <8>
R3C8 can only be <5>
R9C9 can only be <7>
R9C2 can only be <5>
R3C9 can only be <3>
R7C7 can only be <5>
R7C3 can only be <1>
R3C7 can only be <7>
R7C8 can only be <2>
R7C2 can only be <7>
R2C3 can only be <5>
R9C3 can only be <3>
R2C2 can only be <1>


 

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