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Sudoku Solution Path

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R1C4 is the only square in row 1 that can be <5>
R4C5 is the only square in row 4 that can be <6>
R2C7 is the only square in row 2 that can be <6>
R3C3 is the only square in column 3 that can be <9>
R5C4 is the only square in column 4 that can be <8>
R3C4 is the only square in column 4 that can be <3>
Squares R7C4 and R9C4 in block 8 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 block.
   R7C5 - removing <47> from <2457> leaving <25>
   R7C6 - removing <4> from <124> leaving <12>
   R8C5 - removing <4> from <2459> leaving <259>
   R9C6 - removing <4> from <1249> leaving <129>
Intersection of row 3 with block 2. The value <4> 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 this value.
   R2C5 - removing <4> from <47> leaving <7>
R2C9 can only be <3>
Intersection of row 4 with block 6. The value <9> only appears in one or more of squares R4C7, R4C8 and R4C9 of row 4. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R5C7 - removing <9> from <1579> leaving <157>
   R5C8 - removing <9> from <149> leaving <14>
Intersection of column 9 with block 6. The value <8> only appears in one or more of squares R4C9, R5C9 and R6C9 of column 9. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R4C7 - removing <8> from <1589> leaving <159>
   R6C7 - removing <8> from <78> leaving <7>
R3C2 is the only square in row 3 that can be <7>
R1C1 can only be <3>
R1C2 can only be <6>
R1C6 can only be <2>
R1C8 can only be <9>
R7C6 can only be <1>
R3C5 can only be <4>
R1C9 can only be <7>
R3C6 can only be <6>
R6C5 can only be <3>
R6C3 can only be <2>
R5C5 can only be <9>
R9C6 can only be <9>
R5C6 can only be <4>
R5C8 can only be <1>
R5C7 can only be <5>
R6C1 can only be <8>
R5C2 can only be <3>
R4C7 can only be <9>
R6C9 can only be <4>
R4C1 can only be <1>
R9C9 can only be <5>
R9C2 can only be <1>
R8C9 can only be <9>
R4C3 can only be <5>
R2C1 can only be <4>
R4C9 can only be <8>
R5C3 can only be <7>
R7C2 can only be <5>
R7C5 can only be <2>
R7C7 can only be <8>
R8C5 can only be <5>
R7C8 can only be <4>
R3C7 can only be <2>
R7C3 can only be <3>
R7C4 can only be <7>
R9C8 can only be <2>
R8C3 can only be <4>
R3C8 can only be <8>
R8C7 can only be <1>
R2C3 can only be <1>
R8C1 can only be <2>
R9C1 can only be <7>
R9C4 can only be <4>


 

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