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Sudoku Solution Path

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R4C3 can only be <3>
R4C7 can only be <5>
R5C4 can only be <1>
R6C3 can only be <8>
R4C5 can only be <4>
R6C5 can only be <2>
R6C7 can only be <1>
R1C8 is the only square in row 1 that can be <5>
R2C1 is the only square in row 2 that can be <9>
R2C5 is the only square in row 2 that can be <1>
R3C7 is the only square in row 3 that can be <9>
R7C2 is the only square in row 7 that can be <3>
R7C3 is the only square in column 3 that can be <9>
R3C3 is the only square in column 3 that can be <1>
R3C1 can only be <7>
R1C5 is the only square in row 1 that can be <7>
Squares R7C9 and R8C9 in column 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C9 - removing <8> from <238> leaving <23>
Squares R2C9 and R3C9 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R2C8 - removing <2> from <2468> leaving <468>
   R3C8 - removing <2> from <246> leaving <46>
Squares R7C1 and R8C1 in block 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <18>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R8C2 - removing <8> from <4578> leaving <457>
   R9C2 - removing <8> from <4578> leaving <457>
Squares R7C9 and R8C9 in block 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C7 - removing <8> from <468> leaving <46>
   R7C8 - removing <8> from <1468> leaving <146>
   R8C8 - removing <8> from <14678> leaving <1467>
   R9C7 - removing <8> from <248> leaving <24>
   R9C8 - removing <8> from <2478> leaving <247>
R9C5 is the only square in row 9 that can be <8>
R9C2 is the only square in row 9 that can be <5>
Intersection of row 7 with block 9. The value <4> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R8C8 - removing <4> from <1467> leaving <167>
   R9C7 - removing <4> from <24> leaving <2>
   R9C8 - removing <4> from <247> leaving <27>
R9C8 can only be <7>
R5C7 can only be <8>
R9C3 can only be <4>
R5C8 can only be <2>
R1C3 can only be <6>
R8C2 can only be <7>
R1C7 can only be <4>
R5C3 can only be <7>
R1C2 can only be <8>
R7C7 can only be <6>
R3C8 can only be <6>
R3C5 can only be <3>
R2C8 can only be <8>
R8C8 can only be <1>
R5C2 can only be <6>
R7C5 can only be <5>
R8C1 can only be <8>
R7C8 can only be <4>
R3C9 can only be <2>
R5C5 can only be <9>
R2C6 can only be <4>
R3C2 can only be <4>
R2C9 can only be <3>
R5C6 can only be <3>
R7C9 can only be <8>
R8C5 can only be <6>
R7C1 can only be <1>
R8C9 can only be <5>
R8C4 can only be <4>
R2C2 can only be <2>
R2C4 can only be <6>
R8C6 can only be <9>


 

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