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Sudoku Solution Path

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R1C5 is the only square in row 1 that can be <5>
R1C1 is the only square in row 1 that can be <4>
R2C6 is the only square in row 2 that can be <4>
R4C3 is the only square in row 4 that can be <1>
R4C5 is the only square in row 4 that can be <6>
R5C9 is the only square in row 5 that can be <5>
R8C8 is the only square in row 8 that can be <4>
R9C5 is the only square in row 9 that can be <4>
R9C2 is the only square in row 9 that can be <5>
R8C6 is the only square in row 8 that can be <5>
R8C4 is the only square in column 4 that can be <2>
R2C4 is the only square in block 2 that can be <3>
R3C4 is the only square in column 4 that can be <6>
Squares R3C5 and R3C6 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C1 - removing <9> from <279> leaving <27>
   R3C9 - removing <89> from <2789> leaving <27>
Intersection of row 9 with block 9. The value <9> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. 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 <9> from <13789> leaving <1378>
Intersection of column 3 with block 4. The value <7> only appears in one or more of squares R4C3, R5C3 and R6C3 of column 3. 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 <7> from <379> leaving <39>
   R5C1 - removing <7> from <23679> leaving <2369>
   R6C2 - removing <7> from <2379> leaving <239>
Intersection of row 4 with block 6. The value <7> only appears in one or more of squares R4C7, R4C8 and R4C9 of row 4. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R5C7 - removing <7> from <23789> leaving <2389>
   R6C7 - removing <7> from <23789> leaving <2389>
   R6C8 - removing <7> from <3789> leaving <389>
R4C7 is the only square in column 7 that can be <7>
R2C8 is the only square in column 8 that can be <7>
R3C9 can only be <2>
R3C1 can only be <7>
R8C1 can only be <3>
R7C1 can only be <1>
R9C1 can only be <2>
R9C3 can only be <8>
R8C2 can only be <7>
R8C9 can only be <8>
R2C9 can only be <9>
R2C1 can only be <6>
R2C2 can only be <8>
R1C9 can only be <3>
R1C7 can only be <8>
R7C9 can only be <7>
R9C9 can only be <1>
R5C1 can only be <9>
R1C3 can only be <2>
R5C4 can only be <8>
R4C2 can only be <3>
R5C6 can only be <3>
R7C4 can only be <9>
R5C5 can only be <7>
R5C7 can only be <2>
R7C6 can only be <8>
R7C5 can only be <3>
R3C6 can only be <9>
R1C2 can only be <9>
R6C3 can only be <7>
R1C8 can only be <6>
R3C5 can only be <8>
R4C8 can only be <9>
R6C2 can only be <2>
R9C8 can only be <3>
R6C7 can only be <3>
R5C3 can only be <6>
R6C5 can only be <9>
R6C8 can only be <8>
R9C7 can only be <9>


 

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