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Sudoku Solution Path

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R1C8 can only be <8>
R2C1 can only be <7>
R4C4 can only be <3>
R8C9 can only be <8>
R9C8 can only be <3>
R1C2 can only be <4>
R2C9 can only be <1>
R8C1 can only be <3>
R5C1 can only be <2>
R9C2 can only be <7>
R5C9 can only be <9>
R8C2 can only be <6>
R9C5 can only be <1>
R2C8 can only be <6>
R1C5 can only be <2>
R3C7 can only be <3>
R4C2 can only be <9>
R6C2 can only be <5>
R7C3 can only be <8>
R2C2 can only be <8>
R5C2 can only be <3>
R3C3 can only be <5>
R8C4 is the only square in row 8 that can be <9>
Squares R7C4 and R7C7 in row 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R7C5 - removing <4> from <346> leaving <36>
   R7C6 - removing <5> from <356> leaving <36>
Squares R5C5 and R6C4 in block 5 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 block.
   R6C6 - removing <7> from <127> leaving <12>
Squares R6C6 and R6C8 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C3 - removing <1> from <167> leaving <67>
Squares R6C6, R6C8, R4C6 and R4C8 form a Type-1 Unique Rectangle on <12>.
   R4C8 - removing <12> from <124> leaving <4>
R4C7 can only be <6>
R8C8 can only be <5>
R8C6 can only be <7>
R5C8 can only be <1>
R7C7 can only be <4>
R4C3 can only be <1>
R6C7 can only be <8>
R5C3 can only be <7>
R6C8 can only be <2>
R6C4 can only be <7>
R5C7 can only be <5>
R6C6 can only be <1>
R7C4 can only be <5>
R8C5 can only be <4>
R3C6 can only be <6>
R7C6 can only be <3>
R4C6 can only be <2>
R5C5 can only be <8>
R6C3 can only be <6>
R3C5 can only be <7>
R3C4 can only be <8>
R2C4 can only be <4>
R7C5 can only be <6>
R2C6 can only be <5>
R2C5 can only be <3>


 

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