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Sudoku Solution Path

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R1C5 is the only square in row 1 that can be <7>
R1C7 is the only square in row 1 that can be <9>
R2C7 is the only square in row 2 that can be <8>
R3C2 is the only square in row 3 that can be <6>
R3C5 is the only square in row 3 that can be <9>
R4C6 is the only square in row 4 that can be <8>
R5C7 is the only square in row 5 that can be <6>
R4C4 is the only square in row 4 that can be <6>
R4C3 is the only square in row 4 that can be <7>
R5C9 is the only square in row 5 that can be <7>
R5C1 is the only square in row 5 that can be <8>
R5C3 is the only square in row 5 that can be <3>
R1C1 is the only square in row 1 that can be <3>
R7C2 is the only square in row 7 that can be <9>
R4C8 is the only square in row 4 that can be <9>
R6C3 is the only square in row 6 that can be <9>
R8C5 is the only square in row 8 that can be <6>
R9C1 is the only square in row 9 that can be <7>
R9C5 is the only square in row 9 that can be <8>
R7C8 is the only square in row 7 that can be <8>
R2C3 is the only square in column 3 that can be <5>
R2C6 is the only square in row 2 that can be <2>
Squares R6C4 and R6C6 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C2 - removing <4> from <245> leaving <25>
   R6C7 - removing <4> from <1245> leaving <125>
   R6C8 - removing <4> from <124> leaving <12>
Squares R2C4 and R2C5 in block 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R3C4 - removing <14> from <1345> leaving <35>
   R3C6 - removing <4> from <345> leaving <35>
Intersection of row 9 with block 9. The value <5> 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 <5> from <1245> leaving <124>
R9C9 is the only square in column 9 that can be <5>
Squares R7C5<14>, R8C4<134> and R8C6<34> in block 8 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <134>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C4 - removing <14> from <1457> leaving <57>
   R7C6 - removing <4> from <457> leaving <57>
Squares R1C9 and R7C1 form a remote locked pair. <24> can be removed from any square that is common to their groups.
   R7C9 - removing <24> from <124> leaving <1>
R7C5 can only be <4>
R9C7 can only be <4>
R9C3 can only be <1>
R4C7 can only be <5>
R8C7 can only be <2>
R4C2 can only be <4>
R7C1 can only be <2>
R2C5 can only be <1>
R8C6 can only be <3>
R8C4 can only be <1>
R3C6 can only be <5>
R6C7 can only be <1>
R8C3 can only be <4>
R2C4 can only be <4>
R3C4 can only be <3>
R7C6 can only be <7>
R5C2 can only be <2>
R5C8 can only be <4>
R6C2 can only be <5>
R6C8 can only be <2>
R3C8 can only be <1>
R3C1 can only be <4>
R7C4 can only be <5>
R6C6 can only be <4>
R1C3 can only be <2>
R1C9 can only be <4>
R3C9 can only be <2>
R6C4 can only be <7>


 

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