     Sudoku Solution Path   Copyright © Kevin Stone R2C9 is the only square in row 2 that can be <9> R2C4 is the only square in column 4 that can be <2> R2C1 can only be <4> R2C2 can only be <3> R5C2 is the only square in column 2 that can be <4> R4C6 is the only square in column 6 that can be <5> Squares R4C1, R4C2 and R4C9 in row 4 form a simple locked triplet. These 3 squares all contain the 3 possibilities <267>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R4C3 - removing <26> from <269> leaving <9>    R4C5 - removing <7> from <3789> leaving <389> R5C3 can only be <1> R3C3 can only be <8> R1C5 is the only square in row 1 that can be <8> R4C5 can only be <3> R4C4 can only be <8> R3C5 can only be <4> R6C4 can only be <4> R6C6 can only be <7> R3C4 can only be <3> R7C6 can only be <8> R5C5 can only be <9> R8C6 can only be <4> R5C7 can only be <5> R6C5 can only be <1> R5C8 can only be <7> R3C8 can only be <5> R3C2 can only be <1> R8C8 can only be <8> R3C9 can only be <7> R9C1 is the only square in row 9 that can be <8> R7C1 is the only square in column 1 that can be <1> R4C1 is the only square in column 1 that can be <7> Squares R6C1 and R6C9 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R6C7 - removing <6> from <369> leaving <39>    R6C8 - removing <2> from <239> leaving <39> Squares R4C9 and R6C9 in column 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R8C9 - removing <6> from <56> leaving <5>    R9C9 - removing <26> from <12456> leaving <145> R8C1 can only be <6> R6C1 can only be <2> R9C3 can only be <2> R9C8 can only be <4> R1C3 can only be <6> R7C2 can only be <7> R9C9 can only be <1> R1C8 can only be <3> R9C7 can only be <6> R1C9 can only be <4> R1C7 can only be <1> R6C8 can only be <9> R6C9 can only be <6> R1C1 can only be <5> R4C2 can only be <6> R6C7 can only be <3> R7C8 can only be <2> R4C9 can only be <2> R7C5 can only be <6> R9C2 can only be <5> R7C7 can only be <9> R9C5 can only be <7> R1C2 can only be <2>    