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Sudoku Solution Path

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R3C1 can only be <4>
R2C1 can only be <7>
R9C1 can only be <1>
R2C3 is the only square in row 2 that can be <5>
R3C6 is the only square in row 3 that can be <2>
R3C4 is the only square in row 3 that can be <1>
R6C5 is the only square in row 6 that can be <5>
R5C2 is the only square in row 5 that can be <5>
R7C6 is the only square in row 7 that can be <1>
R8C7 is the only square in row 8 that can be <5>
R9C5 is the only square in row 9 that can be <2>
R9C4 is the only square in row 9 that can be <9>
R7C7 is the only square in block 9 that can be <8>
R5C7 is the only square in column 7 that can be <2>
Intersection of row 2 with block 2. The value <4> 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.
   R1C5 - removing <4> from <4689> leaving <689>
   R1C6 - removing <4> from <489> leaving <89>
Intersection of row 3 with block 3. The value <3> 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 this value.
   R2C7 - removing <3> from <369> leaving <69>
Intersection of row 4 with block 5. The value <8> 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.
   R5C4 - removing <8> from <3478> leaving <347>
   R5C5 - removing <8> from <1489> leaving <149>
   R5C6 - removing <8> from <34789> leaving <3479>
   R6C4 - removing <8> from <3478> leaving <347>
R8C4 is the only square in column 4 that can be <8>
Intersection of column 7 with block 3. The value <6> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R1C8 - removing <6> from <467> leaving <47>
   R1C9 - removing <6> from <4679> leaving <479>
   R3C8 - removing <6> from <36> leaving <3>
Squares R2C7 and R3C7 in column 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C7 - removing <9> from <379> leaving <37>
   R6C7 - removing <9> from <379> leaving <37>
R6C3 is the only square in row 6 that can be <9>
R3C3 can only be <6>
R3C7 can only be <9>
R1C2 can only be <9>
R2C7 can only be <6>
R1C6 can only be <8>
R1C5 can only be <6>
R8C5 can only be <4>
R8C6 can only be <7>
R2C5 can only be <9>
R8C3 can only be <2>
R7C4 can only be <6>
R5C5 can only be <1>
R4C5 can only be <8>
R8C9 can only be <6>
R9C8 can only be <7>
R9C2 can only be <6>
R1C8 can only be <4>
R7C9 can only be <2>
R1C9 can only be <7>
R6C8 can only be <8>
R6C1 can only be <3>
R5C8 can only be <6>
R6C7 can only be <7>
R5C1 can only be <8>
R6C4 can only be <4>
R4C7 can only be <3>
R2C4 can only be <3>
R4C6 can only be <9>
R2C6 can only be <4>
R5C4 can only be <7>
R4C9 can only be <4>
R5C6 can only be <3>
R4C2 can only be <7>
R5C9 can only be <9>
R5C3 can only be <4>
R4C3 can only be <1>
R7C2 can only be <4>
R7C3 can only be <7>


 

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