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Sudoku Solution Path

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R5C5 can only be <9>
R7C4 is the only square in row 7 that can be <2>
R7C6 is the only square in row 7 that can be <9>
R2C4 is the only square in row 2 that can be <9>
R7C3 is the only square in row 7 that can be <1>
R6C2 is the only square in row 6 that can be <1>
R9C3 is the only square in row 9 that can be <7>
R2C8 is the only square in column 8 that can be <1>
R2C6 can only be <7>
R3C9 is the only square in row 3 that can be <7>
Squares R1C3 and R3C3 in column 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C3 - removing <5> from <459> leaving <49>
   R6C3 - removing <3> from <349> leaving <49>
Squares R1C7 and R3C7 in column 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C7 - removing <28> from <2489> leaving <49>
   R6C7 - removing <2> from <23469> leaving <3469>
   R7C7 - removing <8> from <368> leaving <36>
   R9C7 - removing <8> from <348> leaving <34>
Squares R4C3 and R4C7 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C8 - removing <4> from <478> leaving <78>
Squares R1C3 and R3C3 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R3C1 - removing <3> from <238> leaving <28>
Squares R3C1 and R3C7 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C4 - removing <8> from <1358> leaving <135>
Intersection of row 9 with block 8. The values <18> only appears in one or more of squares R9C4, R9C5 and R9C6 of row 9. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain these values.
   R8C4 - removing <8> from <358> leaving <35>
   R8C5 - removing <8> from <368> leaving <36>
Squares R4C3, R4C7, R6C3 and R6C7 form a Type-1 Unique Rectangle on <49>.
   R6C7 - removing <49> from <3469> leaving <36>
R6C3 is the only square in row 6 that can be <9>
R4C3 can only be <4>
R4C7 can only be <9>
R6C8 is the only square in row 6 that can be <4>
R8C6 is the only square in row 8 that can be <4>
R9C6 can only be <1>
R3C6 can only be <5>
R3C3 can only be <3>
R1C6 can only be <6>
R3C4 can only be <1>
R1C3 can only be <5>
R8C4 is the only square in row 8 that can be <5>
R8C5 is the only square in row 8 that can be <6>
R9C7 is the only square in row 9 that can be <4>
Squares R6C1 and R6C7 in row 6 and R7C1 and R7C7 in row 7 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in columns 1 and 7 can be removed.
   R5C1 - removing <3> from <367> leaving <67>
Squares R9C4, R9C5, R1C4 and R1C5 form a Type-1 Unique Rectangle on <38>.
   R1C5 - removing <38> from <238> leaving <2>
R1C7 can only be <8>
R2C5 can only be <8>
R1C4 can only be <3>
R3C7 can only be <2>
R2C2 can only be <2>
R9C5 can only be <3>
R3C1 can only be <8>
R9C4 can only be <8>
R4C2 can only be <5>
R7C1 can only be <3>
R5C2 can only be <3>
R5C8 can only be <7>
R8C2 can only be <8>
R5C1 can only be <6>
R4C8 can only be <8>
R7C7 can only be <6>
R7C9 can only be <8>
R6C7 can only be <3>
R4C9 can only be <2>
R8C8 can only be <3>
R4C1 can only be <7>
R6C9 can only be <6>
R5C9 can only be <5>
R6C1 can only be <2>


 

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