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Sudoku Solution Path

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R1C1 can only be <5>
R1C9 can only be <4>
R1C5 can only be <1>
R5C4 is the only square in row 5 that can be <1>
R5C5 is the only square in row 5 that can be <8>
R5C6 is the only square in row 5 that can be <4>
R6C2 is the only square in row 6 that can be <3>
R5C7 is the only square in row 5 that can be <3>
R9C9 is the only square in row 9 that can be <6>
R5C8 is the only square in row 5 that can be <6>
R8C4 is the only square in column 4 that can be <6>
R2C6 is the only square in column 6 that can be <3>
Squares R3C1 and R3C3 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <37>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C7 - removing <7> from <178> leaving <18>
   R3C8 - removing <7> from <12578> leaving <1258>
   R3C9 - removing <7> from <257> leaving <25>
Squares R4C2 and R5C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R7C2 - removing <59> from <5689> leaving <68>
   R8C2 - removing <59> from <589> leaving <8>
R7C2 can only be <6>
R2C3 is the only square in row 2 that can be <6>
Squares R4C2 and R5C2 in block 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R5C1 - removing <9> from <279> leaving <27>
   R5C3 - removing <5> from <257> leaving <27>
R5C2 is the only square in row 5 that can be <9>
R4C2 can only be <5>
R5C9 is the only square in row 5 that can be <5>
R3C9 can only be <2>
R7C9 can only be <7>
R8C5 is the only square in row 8 that can be <7>
R2C7 is the only square in column 7 that can be <7>
Squares R4C8 and R6C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R7C8 - removing <9> from <289> leaving <28>
   R8C8 - removing <9> from <129> leaving <12>
Intersection of column 5 with block 8. The value <9> only appears in one or more of squares R7C5, R8C5 and R9C5 of column 5. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R8C6 - removing <9> from <259> leaving <25>
R8C7 is the only square in row 8 that can be <9>
R7C7 can only be <8>
R7C8 can only be <2>
R3C7 can only be <1>
R8C8 can only be <1>
R2C8 can only be <5>
R2C4 can only be <2>
R3C8 can only be <8>
R3C2 can only be <4>
R2C5 can only be <4>
R4C4 can only be <7>
R2C2 can only be <1>
R3C5 can only be <5>
R7C5 can only be <9>
R4C8 can only be <9>
R6C4 can only be <5>
R4C6 can only be <2>
R6C8 can only be <7>
R6C6 can only be <9>
R7C1 can only be <3>
R9C5 can only be <2>
R9C1 can only be <9>
R8C6 can only be <5>
R7C3 can only be <5>
R3C1 can only be <7>
R8C3 can only be <2>
R5C3 can only be <7>
R3C3 can only be <3>
R5C1 can only be <2>


 

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