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Sudoku Solution Path

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R3C4 can only be <1>
R3C6 can only be <3>
R4C4 can only be <9>
R6C4 can only be <8>
R4C6 can only be <2>
R7C4 can only be <7>
R6C6 can only be <5>
R6C3 can only be <6>
R7C6 can only be <9>
R5C5 can only be <7>
R6C7 can only be <2>
R4C3 can only be <1>
R4C7 can only be <6>
R8C7 is the only square in row 8 that can be <7>
R2C3 is the only square in row 2 that can be <7>
R3C9 is the only square in row 3 that can be <7>
R8C3 is the only square in row 8 that can be <9>
R7C2 is the only square in column 2 that can be <1>
R3C2 is the only square in column 2 that can be <8>
R1C7 is the only square in row 1 that can be <8>
R3C3 is the only square in column 3 that can be <5>
R3C8 is the only square in column 8 that can be <2>
Squares R9C1 and R9C3 in row 9 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 row.
   R9C5 - removing <2> from <25> leaving <5>
   R9C7 - removing <3> from <1359> leaving <159>
R7C5 can only be <2>
R7C7 is the only square in column 7 that can be <3>
Intersection of column 7 with block 3. The value <4> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R2C8 - removing <4> from <456> leaving <56>
Squares R2C2 and R2C8 in row 2 and R8C2 and R8C8 in row 8 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 2 and 8 can be removed.
   R7C8 - removing <6> from <456> leaving <45>
The puzzle can be reduced to a Bivalue Universal Grave (BUG) pattern, by making this reduction:
   R1C1=<29>
These are called the BUG possibilities. In a BUG pattern, in each row, column and block, each unsolved possibility appears exactly twice. Such a pattern either has 0 or 2 solutions, so it cannot be part of a valid Sudoku
When a puzzle contains a BUG, and only one square in the puzzle has more than 2 possibilities, the only way to kill the BUG is to remove both of the BUG possibilities from the square, thus solving it
   R1C1 - removing <29> from <269> leaving <6>
R1C5 can only be <4>
R1C9 can only be <9>
R3C1 can only be <9>
R7C1 can only be <8>
R2C2 can only be <4>
R1C3 can only be <2>
R3C5 can only be <6>
R9C9 can only be <1>
R3C7 can only be <4>
R2C7 can only be <5>
R8C2 can only be <6>
R2C8 can only be <6>
R5C7 can only be <1>
R8C8 can only be <4>
R5C9 can only be <5>
R9C7 can only be <9>
R7C9 can only be <6>
R7C3 can only be <4>
R5C1 can only be <3>
R7C8 can only be <5>
R9C3 can only be <3>
R5C3 can only be <8>
R9C1 can only be <2>

 

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