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 Sudoku Solution Path   R2C1 is the only square in row 2 that can be <3> R5C1 is the only square in row 5 that can be <4> R4C7 is the only square in row 4 that can be <4> R1C1 is the only square in column 1 that can be <1> R4C1 is the only square in column 1 that can be <9> R3C7 is the only square in column 7 that can be <9> R1C4 is the only square in row 1 that can be <9> R2C9 is the only square in block 3 that can be <1> Squares R1C8 and R1C9 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <78>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R1C2 - removing <8> from <28> leaving <2>    R1C5 - removing <78> from <25678> leaving <256>    R1C6 - removing <8> from <2568> leaving <256> R3C3 can only be <8> R3C4 can only be <1> R3C6 can only be <2> R5C9 is the only square in row 5 that can be <2> R5C8 is the only square in row 5 that can be <9> R5C2 is the only square in row 5 that can be <7> R6C3 is the only square in row 6 that can be <2> R9C5 is the only square in row 9 that can be <2> R9C6 is the only square in row 9 that can be <4> R2C6 can only be <8> R2C4 can only be <7> R2C5 can only be <4> R7C7 is the only square in row 7 that can be <7> R6C7 can only be <8> R7C4 is the only square in row 7 that can be <8> R5C5 is the only square in row 5 that can be <8> R4C2 is the only square in row 4 that can be <8> R4C5 is the only square in row 4 that can be <5> R1C5 can only be <6> R1C6 can only be <5> R6C5 can only be <1> R8C5 can only be <7> R4C8 is the only square in row 4 that can be <1> R8C6 is the only square in row 8 that can be <1> R9C9 is the only square in row 9 that can be <9> Squares R6C2 and R9C2 in column 2 and R6C8 and R9C8 in column 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in rows 6 and 9 can be removed.    R9C4 - removing <3> from <356> leaving <56>    R6C9 - removing <3> from <367> leaving <67> The puzzle can be reduced to a Bivalue Universal Grave (BUG) pattern, by making this reduction:    R9C1=<68> 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 <68> from <568> leaving <5> R9C2 can only be <3> R9C4 can only be <6> R6C1 can only be <6> R8C1 can only be <8> R9C8 can only be <8> R6C2 can only be <5> R7C3 can only be <6> R5C4 can only be <3> R7C6 can only be <3> R1C8 can only be <7> R8C9 can only be <3> R1C9 can only be <8> R6C8 can only be <3> R5C6 can only be <6> R8C4 can only be <5> R6C9 can only be <7> R4C3 can only be <3> R4C9 can only be <6>

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