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 Sudoku Solution Path    R3C6 can only be <6> R5C8 can only be <5> R6C3 can only be <5> R6C5 can only be <2> R7C4 can only be <4> R5C6 can only be <7> R6C6 can only be <4> R4C3 can only be <7> R2C5 can only be <8> R6C7 can only be <6> R4C4 can only be <6> R6C4 can only be <3> R4C7 can only be <4> R3C4 can only be <2> R3C8 can only be <1> R4C5 can only be <1> R2C3 can only be <2> R5C2 can only be <3> R4C6 can only be <5> R8C5 can only be <7> R2C7 can only be <5> R5C4 can only be <8> R5C5 can only be <9> R7C6 can only be <1> R2C9 can only be <4> R2C1 can only be <7> R8C1 is the only square in row 8 that can be <3> Squares R1C7 and R3C9 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R1C9 - removing <89> from <2689> leaving <26> Squares R3C1 and R3C9 in row 3 and R7C1 and R7C9 in row 7 form a Simple X-Wing pattern on possibility <9>. All other instances of this possibility in columns 1 and 9 can be removed.    R1C1 - removing <9> from <159> leaving <15>    R8C9 - removing <9> from <69> leaving <6> R1C9 can only be <2> R9C8 can only be <7> R7C8 can only be <2> R1C8 can only be <6> R7C2 is the only square in row 7 that can be <7> R9C3 is the only square in row 9 that can be <6> The puzzle can be reduced to a Bivalue Universal Grave (BUG) pattern, by making this reduction:    R9C1=<14> 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    R9C1 - removing <14> from <145> leaving <5> R9C2 can only be <4> R9C9 can only be <8> R1C1 can only be <1> R7C1 can only be <9> R3C2 can only be <8> R9C7 can only be <1> R3C9 can only be <9> R1C3 can only be <9> R1C7 can only be <8> R8C3 can only be <1> R3C1 can only be <4> R1C2 can only be <5> R7C9 can only be <5> R8C7 can only be <9>