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Sudoku Solution Path

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R3C7 can only be <6>
R7C3 can only be <6>
R7C5 can only be <8>
R7C7 can only be <5>
R8C4 can only be <2>
R5C7 can only be <2>
R8C2 can only be <3>
R9C2 can only be <2>
R9C1 can only be <1>
R1C2 can only be <6>
R2C2 can only be <7>
R6C2 can only be <5>
R6C8 can only be <6>
R4C2 can only be <9>
R6C1 can only be <7>
R8C1 can only be <8>
R6C5 can only be <2>
R6C9 can only be <8>
R2C6 is the only square in row 2 that can be <6>
R2C4 is the only square in row 2 that can be <8>
R5C1 is the only square in row 5 that can be <6>
R8C6 is the only square in row 8 that can be <7>
R9C9 is the only square in row 9 that can be <6>
R9C8 is the only square in row 9 that can be <3>
Squares R1C6 and R3C5 in block 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R1C5 - removing <34> from <1349> leaving <19>
Squares R1C4 and R1C5 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R1C8 - removing <1> from <125> leaving <25>
   R1C9 - removing <1> from <135> leaving <35>
Intersection of row 4 with block 6. The value <5> 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.
   R5C9 - removing <5> from <457> leaving <47>
Squares R1C6 and R5C3 form a remote locked pair. <34> can be removed from any square that is common to their groups.
   R5C6 - removing <3> from <35> leaving <5>
R5C4 can only be <1>
R9C6 can only be <4>
R9C5 can only be <9>
R1C6 can only be <3>
R1C9 can only be <5>
R3C5 can only be <4>
R1C8 can only be <2>
R3C3 can only be <3>
R1C4 can only be <9>
R9C4 can only be <5>
R1C5 can only be <1>
R1C1 can only be <4>
R2C8 can only be <1>
R2C9 can only be <3>
R8C8 can only be <4>
R2C1 can only be <2>
R5C3 can only be <4>
R5C9 can only be <7>
R4C1 can only be <3>
R5C5 can only be <3>
R4C9 can only be <4>
R8C9 can only be <1>
R4C8 can only be <5>
R4C5 can only be <7>


 

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