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Sudoku Solution Path

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R7C3 can only be <1>
R7C9 is the only square in row 7 that can be <8>
R9C3 is the only square in column 3 that can be <6>
Intersection of row 4 with block 5. The value <4> only appears in one or more of squares R4C4, R4C5 and R4C6 of row 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
   R5C5 - removing <4> from <12346> leaving <1236>
   R5C6 - removing <4> from <1467> leaving <167>
Squares R5C6, R5C7 and R5C9 in row 5 form a simple locked triplet. These 3 squares all contain the 3 possibilities <167>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R5C1 - removing <1> from <1348> leaving <348>
   R5C4 - removing <7> from <2378> leaving <238>
   R5C5 - removing <16> from <1236> leaving <23>
Intersection of column 1 with block 1. The value <1> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R2C2 - removing <1> from <1237> leaving <237>
Intersection of column 3 with block 1. The value <2> only appears in one or more of squares R1C3, R2C3 and R3C3 of column 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R1C2 - removing <2> from <2578> leaving <578>
   R2C2 - removing <2> from <237> leaving <37>
Intersection of block 2 with row 2. The value <7> only appears in one or more of squares R2C4, R2C5 and R2C6 of block 2. These squares are the ones that intersect with row 2. Thus, the other (non-intersecting) squares of row 2 cannot contain this value.
   R2C1 - removing <7> from <1347> leaving <134>
   R2C2 - removing <7> from <37> leaving <3>
   R2C8 - removing <7> from <12467> leaving <1246>
   R2C9 - removing <7> from <1367> leaving <136>
R4C2 can only be <1>
R6C2 can only be <8>
R6C4 can only be <5>
R8C4 can only be <3>
R4C4 can only be <7>
R4C8 can only be <9>
R2C4 can only be <2>
R4C6 can only be <4>
R5C4 can only be <8>
R3C5 can only be <4>
R3C3 can only be <2>
R1C5 can only be <6>
R4C5 can only be <3>
R5C5 can only be <2>
R2C6 can only be <7>
R1C3 can only be <4>
R5C3 can only be <3>
R2C1 can only be <1>
R2C9 can only be <6>
R3C1 can only be <7>
R2C8 can only be <4>
R3C7 can only be <1>
R1C2 can only be <5>
R3C9 can only be <3>
R5C1 can only be <4>
R1C1 can only be <8>
R8C2 can only be <2>
R9C2 can only be <7>
R7C7 is the only square in row 7 that can be <7>
R5C7 can only be <6>
R5C6 can only be <1>
R6C8 can only be <1>
R6C5 can only be <9>
R8C8 can only be <6>
R9C8 can only be <2>
R5C9 can only be <7>
R9C7 can only be <9>
R1C8 can only be <7>
R1C9 can only be <9>
R1C7 can only be <2>
R8C6 can only be <9>
R6C6 can only be <6>
R7C5 can only be <5>
R7C1 can only be <9>
R9C5 can only be <1>
R8C1 can only be <5>
R9C9 can only be <5>
R9C1 can only be <3>
R8C9 can only be <1>


 

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