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Sudoku Solution Path

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R5C5 can only be <5>
R7C9 can only be <6>
R7C1 can only be <3>
R3C9 can only be <8>
R9C7 can only be <1>
R8C8 can only be <7>
R5C9 can only be <2>
R7C5 can only be <7>
R5C1 can only be <6>
R1C4 is the only square in row 1 that can be <7>
R1C6 is the only square in row 1 that can be <9>
R7C6 can only be <8>
R7C4 can only be <9>
R2C4 is the only square in row 2 that can be <8>
R6C1 is the only square in row 6 that can be <2>
R9C4 is the only square in column 4 that can be <3>
Squares R4C1 and R4C9 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C2 - removing <5> from <15> leaving <1>
   R4C3 - removing <45> from <4578> leaving <78>
R6C8 is the only square in row 6 that can be <1>
Squares R6C3 and R6C9 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C2 - removing <5> from <359> leaving <39>
Intersection of row 3 with block 2. The values <16> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.
   R1C5 - removing <6> from <346> leaving <34>
   R2C5 - removing <6> from <236> leaving <23>
   R2C6 - removing <6> from <256> leaving <25>
Squares R6C2, R6C7, R5C2 and R5C7 form a Type-1 Unique Rectangle on <39>.
   R5C7 - removing <39> from <379> leaving <7>
R5C3 can only be <8>
R4C7 can only be <6>
R4C8 can only be <8>
R1C7 can only be <3>
R4C3 can only be <7>
R5C8 can only be <3>
R5C2 can only be <9>
R2C8 can only be <6>
R6C7 can only be <9>
R6C2 can only be <3>
R1C5 can only be <4>
R2C2 can only be <5>
R1C3 can only be <6>
R2C6 can only be <2>
R8C2 can only be <6>
R3C1 can only be <4>
R2C5 can only be <3>
R4C1 can only be <5>
R4C9 can only be <4>
R6C3 can only be <4>
R6C9 can only be <5>
R8C5 can only be <1>
R9C3 can only be <5>
R8C4 can only be <5>
R3C5 can only be <6>
R9C6 can only be <6>
R9C5 can only be <2>
R3C6 can only be <5>
R3C4 can only be <1>
R8C6 can only be <4>


 

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