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Sudoku Solution Path

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R2C9 is the only square in row 2 that can be <2>
R4C9 is the only square in row 4 that can be <4>
R4C8 is the only square in row 4 that can be <6>
R5C1 is the only square in row 5 that can be <4>
R6C6 is the only square in row 6 that can be <3>
R6C1 is the only square in column 1 that can be <1>
R7C9 is the only square in column 9 that can be <6>
Intersection of row 2 with block 2. The value <3> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. 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 <134589> leaving <14589>
   R3C5 - removing <3> from <3568> leaving <568>
Intersection of row 6 with block 4. The value <2> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
   R4C2 - removing <2> from <258> leaving <58>
   R5C3 - removing <2> from <2578> leaving <578>
Intersection of row 8 with block 7. The value <5> only appears in one or more of squares R8C1, R8C2 and R8C3 of row 8. 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 <258> leaving <28>
   R7C2 - removing <5> from <235789> leaving <23789>
   R7C3 - removing <5> from <23578> leaving <2378>
Intersection of row 9 with block 7. The value <6> 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.
   R8C1 - removing <6> from <568> leaving <58>
Intersection of column 5 with block 2. The value <5> only appears in one or more of squares R1C5, R2C5 and R3C5 of column 5. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.
   R2C4 - removing <5> from <3589> leaving <389>
   R3C4 - removing <5> from <14589> leaving <1489>
Intersection of column 9 with block 3. The value <8> 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.
   R2C8 - removing <8> from <589> leaving <59>
   R3C8 - removing <8> from <15789> leaving <1579>
Intersection of row 2 with block 2. The values <38> only appears in one or more of squares R2C4, R2C5 and R2C6 of row 2. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.
   R1C6 - removing <8> from <168> leaving <16>
   R3C4 - removing <8> from <1489> leaving <149>
   R3C5 - removing <8> from <568> leaving <56>
   R3C6 - removing <8> from <14689> leaving <1469>
Squares R7C1<28>, R9C1<268> and R9C3<268> in block 7 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <268>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C2 - removing <28> from <23789> leaving <379>
   R7C3 - removing <28> from <2378> leaving <37>
   R8C1 - removing <8> from <58> leaving <5>
   R8C2 - removing <8> from <3589> leaving <359>
Intersection of row 8 with block 8. The values <68> only appears in one or more of squares R8C4, R8C5 and R8C6 of row 8. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.
   R7C4 - removing <8> from <123489> leaving <12349>
   R7C5 - removing <8> from <38> leaving <3>
   R7C6 - removing <8> from <12489> leaving <1249>
   R9C4 - removing <8> from <1289> leaving <129>
R7C3 can only be <7>
R7C2 can only be <9>
R8C2 can only be <3>
R2C4 is the only square in row 2 that can be <3>
R5C7 is the only square in row 5 that can be <7>
R6C8 can only be <5>
R6C3 can only be <2>
R2C8 can only be <9>
R4C7 can only be <2>
R5C9 can only be <1>
R2C6 can only be <8>
R6C2 can only be <7>
R2C5 can only be <5>
R5C6 can only be <2>
R3C5 can only be <6>
R8C5 can only be <8>
R1C6 can only be <1>
R8C4 can only be <9>
R7C6 can only be <4>
R3C6 can only be <9>
R8C6 can only be <6>
R3C4 can only be <4>
R1C3 is the only square in row 1 that can be <6>
R9C3 can only be <8>
R9C8 can only be <1>
R5C3 can only be <5>
R7C1 can only be <2>
R9C4 can only be <2>
R9C7 can only be <9>
R3C8 can only be <7>
R7C8 can only be <8>
R7C7 can only be <5>
R5C4 can only be <8>
R3C3 can only be <3>
R4C2 can only be <8>
R4C4 can only be <5>
R7C4 can only be <1>
R3C1 can only be <8>
R9C1 can only be <6>
R1C7 can only be <3>
R3C7 can only be <1>
R3C9 can only be <5>
R1C2 can only be <5>
R3C2 can only be <2>
R1C9 can only be <8>


 

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