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Sudoku Solution Path

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R2C8 is the only square in row 2 that can be <2>
R4C2 is the only square in row 4 that can be <4>
R5C7 is the only square in row 5 that can be <3>
R1C7 can only be <1>
R3C7 can only be <5>
R7C7 can only be <9>
R9C7 can only be <6>
R5C5 is the only square in row 5 that can be <6>
R4C5 can only be <1>
R4C9 can only be <6>
R6C5 can only be <7>
R2C5 can only be <4>
R1C1 is the only square in row 1 that can be <6>
R6C1 is the only square in row 6 that can be <2>
R7C6 is the only square in column 6 that can be <4>
Squares R2C4<16>, R2C6<167> and R3C6<17> in block 2 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <167>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R3C4 - removing <1> from <138> leaving <38>
Squares R7C1<178>, R7C3<1278>, R9C1<18> and R9C3<128> in block 7 form a comprehensive locked quad. These 4 squares can only contain the 4 possibilities <1278>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R8C2 - removing <17> from <1357> leaving <35>
   R9C2 - removing <18> from <1358> leaving <35>
R8C8 is the only square in row 8 that can be <7>
R1C8 can only be <4>
R3C3 is the only square in row 3 that can be <4>
R9C9 is the only square in row 9 that can be <4>
Squares R8C2 and R8C5 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C4 - removing <3> from <136> leaving <16>
R3C4 is the only square in column 4 that can be <3>
R3C9 can only be <7>
R3C6 can only be <1>
R1C9 can only be <3>
R8C6 can only be <6>
R2C4 can only be <6>
R8C4 can only be <1>
R2C6 can only be <7>
R2C2 can only be <1>
R7C4 can only be <8>
R6C2 can only be <8>
R4C1 can only be <9>
R4C8 can only be <8>
R3C1 can only be <8>
R5C2 can only be <7>
R5C3 can only be <1>
R1C2 can only be <9>
R5C8 can only be <9>
R1C5 can only be <8>
R1C3 can only be <7>
R3C5 can only be <9>
R9C1 can only be <1>
R9C8 can only be <5>
R7C1 can only be <7>
R9C2 can only be <3>
R6C8 can only be <1>
R7C9 can only be <1>
R7C3 can only be <2>
R6C9 can only be <5>
R7C5 can only be <5>
R9C3 can only be <8>
R8C5 can only be <3>
R8C2 can only be <5>
R9C5 can only be <2>


 

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