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Sudoku Solution Path

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R1C4 is the only square in row 1 that can be <3>
R3C9 is the only square in row 3 that can be <4>
R1C6 is the only square in row 1 that can be <4>
R5C9 is the only square in row 5 that can be <3>
R5C3 is the only square in row 5 that can be <4>
R8C4 is the only square in row 8 that can be <4>
R9C4 is the only square in column 4 that can be <5>
Intersection of row 5 with block 4. The value <8> only appears in one or more of squares R5C1, R5C2 and R5C3 of row 5. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
   R4C1 - removing <8> from <125789> leaving <12579>
   R4C2 - removing <8> from <12578> leaving <1257>
   R6C1 - removing <8> from <12789> leaving <1279>
   R6C2 - removing <8> from <1278> leaving <127>
R5C2 is the only square in column 2 that can be <8>
Intersection of row 5 with block 6. The value <6> only appears in one or more of squares R5C7, R5C8 and R5C9 of row 5. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R6C8 - removing <6> from <1679> leaving <179>
   R6C9 - removing <6> from <2689> leaving <289>
Intersection of column 4 with block 5. The value <7> only appears in one or more of squares R4C4, R5C4 and R6C4 of column 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
   R4C6 - removing <7> from <178> leaving <18>
   R6C6 - removing <7> from <1678> leaving <168>
Intersection of column 5 with block 8. The value <8> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R9C6 - removing <8> from <12678> leaving <1267>
Intersection of column 6 with block 8. The value <7> only appears in one or more of squares R7C6, R8C6 and R9C6 of column 6. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R7C5 - removing <7> from <1278> leaving <128>
   R8C5 - removing <7> from <267> leaving <26>
   R9C5 - removing <7> from <12678> leaving <1268>
Intersection of column 7 with block 9. The value <2> only appears in one or more of squares R7C7, R8C7 and R9C7 of column 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R7C9 - removing <2> from <25> leaving <5>
   R9C9 - removing <2> from <269> leaving <69>
R1C9 can only be <6>
R1C7 can only be <1>
R9C9 can only be <9>
R3C7 can only be <9>
R2C8 can only be <5>
R2C5 is the only square in row 2 that can be <9>
R8C2 is the only square in row 8 that can be <5>
R4C1 is the only square in row 4 that can be <5>
R1C3 is the only square in row 1 that can be <5>
R4C8 is the only square in row 4 that can be <9>
R6C1 is the only square in row 6 that can be <9>
R3C1 is the only square in column 1 that can be <6>
Intersection of row 8 with block 8. The value <2> 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 this value.
   R7C5 - removing <2> from <128> leaving <18>
   R9C5 - removing <2> from <1268> leaving <168>
   R9C6 - removing <2> from <1267> leaving <167>
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.
   R5C1 - removing <7> from <17> leaving <1>
R2C2 is the only square in column 2 that can be <1>
R2C4 can only be <6>
R3C3 can only be <7>
R2C6 can only be <2>
R1C5 can only be <7>
R3C5 can only be <1>
R1C1 can only be <2>
R7C5 can only be <8>
R9C5 can only be <6>
R8C5 can only be <2>
R8C6 can only be <7>
R7C1 can only be <7>
R7C7 can only be <2>
R9C1 can only be <8>
R7C3 can only be <1>
R9C7 can only be <7>
R8C8 can only be <6>
R9C6 can only be <1>
R5C8 can only be <7>
R9C3 can only be <2>
R4C6 can only be <8>
R5C7 can only be <6>
R4C9 can only be <2>
R6C6 can only be <6>
R4C2 can only be <7>
R6C9 can only be <8>
R6C8 can only be <1>
R6C4 can only be <7>
R4C4 can only be <1>
R6C2 can only be <2>


 

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