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Sudoku Solution Path

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R5C4 can only be <7>
R3C9 is the only square in row 3 that can be <8>
R9C9 can only be <1>
R4C5 is the only square in row 4 that can be <8>
R6C5 is the only square in row 6 that can be <6>
R7C4 is the only square in row 7 that can be <8>
R9C4 can only be <6>
R1C6 is the only square in row 1 that can be <6>
R7C5 is the only square in row 7 that can be <4>
R8C8 is the only square in row 8 that can be <6>
R5C5 is the only square in column 5 that can be <5>
R5C6 can only be <9>
R1C7 is the only square in column 7 that can be <5>
Squares R8C2 and R8C5 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C3 - removing <17> from <1278> leaving <28>
Intersection of column 8 with block 3. The value <7> only appears in one or more of squares R1C8, R2C8 and R3C8 of column 8. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R1C9 - removing <7> from <2479> leaving <249>
Intersection of row 1 with block 1. The value <7> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R2C2 - removing <7> from <147> leaving <14>
   R2C3 - removing <7> from <12479> leaving <1249>
   R3C1 - removing <7> from <12579> leaving <1259>
   R3C2 - removing <7> from <1457> leaving <145>
R8C2 is the only square in column 2 that can be <7>
R8C5 can only be <1>
R7C6 can only be <5>
R9C6 can only be <7>
R3C6 can only be <1>
R3C2 is the only square in column 2 that can be <5>
R3C4 is the only square in row 3 that can be <4>
R1C4 can only be <2>
R7C9 is the only square in column 9 that can be <2>
R8C7 can only be <8>
R8C3 can only be <2>
R9C7 can only be <3>
R9C1 can only be <5>
R6C7 can only be <9>
R7C8 can only be <9>
R6C9 can only be <7>
R6C3 can only be <5>
R4C9 can only be <4>
R9C3 can only be <8>
R6C1 can only be <3>
R4C7 can only be <1>
R1C9 can only be <9>
R7C1 can only be <1>
R7C2 can only be <3>
R1C1 can only be <7>
R5C7 can only be <2>
R5C8 can only be <3>
R2C7 can only be <4>
R1C3 can only be <4>
R4C1 can only be <9>
R5C3 can only be <1>
R2C2 can only be <1>
R2C3 can only be <9>
R5C2 can only be <4>
R2C5 can only be <7>
R4C3 can only be <7>
R3C1 can only be <2>
R2C8 can only be <2>
R3C5 can only be <9>
R3C8 can only be <7>


 

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