     Sudoku Solution Path   Sudoku Puzzle © Kevin Stone R1C1 can only be <7> R2C8 can only be <4> R5C5 can only be <6> R7C3 can only be <2> R2C2 can only be <2> R3C7 can only be <1> R7C7 can only be <5> R1C9 can only be <6> R1C5 can only be <4> R3C3 can only be <4> R7C5 can only be <9> R4C7 can only be <4> R2C4 can only be <9> R5C2 is the only square in row 5 that can be <4> R5C9 is the only square in row 5 that can be <8> R4C2 is the only square in row 4 that can be <8> R9C4 is the only square in row 9 that can be <4> Squares R2C5 and R9C5 in column 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R8C5 - removing <5> from <257> leaving <27> Squares R5C8 and R8C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <13>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R4C8 - removing <3> from <356> leaving <56>    R6C8 - removing <1> from <156> leaving <56> Squares R7C4 and R7C6 in block 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R8C4 - removing <1> from <123> leaving <23>    R8C6 - removing <1> from <1357> leaving <357>    R9C6 - removing <1> from <1358> leaving <358> Squares R2C5, R2C6, R9C5 and R9C6 form a Type-1 Unique Rectangle on <58>.    R9C6 - removing <58> from <358> leaving <3> R9C9 can only be <1> R1C6 can only be <1> R8C4 can only be <2> R9C1 can only be <5> R6C9 can only be <2> R8C8 can only be <3> R1C4 can only be <3> R7C6 can only be <6> R4C9 can only be <3> R7C4 can only be <1> R3C6 can only be <7> R8C5 can only be <7> R3C4 can only be <6> R8C6 can only be <5> R3C5 can only be <2> R8C2 can only be <1> R2C6 can only be <8> R9C5 can only be <8> R5C8 can only be <1> R4C1 can only be <2> R2C5 can only be <5> R4C3 can only be <6> R5C1 can only be <9> R6C2 can only be <5> R4C8 can only be <5> R6C3 can only be <7> R6C8 can only be <6> R5C7 can only be <7> R6C1 can only be <1> R5C3 can only be <3> R6C7 can only be <9>    