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Sudoku Solution Path

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R4C4 can only be <8>
R6C4 can only be <4>
R8C1 can only be <8>
R8C2 can only be <5>
R5C4 can only be <6>
R1C4 can only be <9>
R9C4 can only be <7>
R1C3 is the only square in row 1 that can be <8>
R1C2 is the only square in row 1 that can be <3>
R4C3 is the only square in row 4 that can be <1>
R5C5 is the only square in row 5 that can be <1>
R1C7 is the only square in column 7 that can be <7>
Squares R9C1 and R9C2 in row 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R9C3 - removing <2> from <246> leaving <46>
Squares R1C1 and R9C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C1 - removing <1> from <179> leaving <79>
   R5C1 - removing <2> from <279> leaving <79>
Intersection of column 5 with block 2. The values <25> 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 these values.
   R1C6 - removing <25> from <2456> leaving <46>
Squares R1C6 and R2C5 in block 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R1C5 - removing <46> from <2456> leaving <25>
Intersection of column 5 with block 8. The values <38> 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 these values.
   R9C6 - removing <3> from <346> leaving <46>
Squares R9C3 and R9C6 in row 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R9C5 - removing <46> from <3468> leaving <38>
   R9C7 - removing <46> from <345689> leaving <3589>
   R9C8 - removing <46> from <45689> leaving <589>
   R9C9 - removing <4> from <3459> leaving <359>
R7C7 is the only square in column 7 that can be <6>
R7C3 can only be <4>
R8C8 can only be <4>
R8C9 can only be <3>
R8C5 can only be <6>
R7C5 can only be <8>
R9C3 can only be <6>
R9C5 can only be <3>
R2C5 can only be <4>
R9C6 can only be <4>
R1C6 can only be <6>
R1C8 can only be <5>
R1C5 can only be <2>
R3C7 can only be <9>
R3C3 can only be <2>
R6C7 can only be <3>
R2C8 can only be <6>
R2C9 can only be <1>
R6C6 can only be <2>
R4C7 can only be <5>
R1C1 can only be <1>
R3C5 can only be <5>
R2C2 can only be <7>
R1C9 can only be <4>
R6C3 can only be <9>
R4C6 can only be <3>
R9C7 can only be <8>
R5C3 can only be <3>
R5C1 can only be <7>
R9C8 can only be <9>
R5C7 can only be <4>
R9C9 can only be <5>
R5C8 can only be <8>
R9C1 can only be <2>
R5C9 can only be <9>
R2C1 can only be <9>
R5C2 can only be <2>
R5C6 can only be <5>
R9C2 can only be <1>


 

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