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Sudoku Solution Path

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R1C7 is the only square in row 1 that can be <2>
R2C7 is the only square in row 2 that can be <5>
R4C9 is the only square in row 4 that can be <3>
R8C9 is the only square in row 8 that can be <4>
R2C9 can only be <9>
R2C1 can only be <3>
R2C8 can only be <4>
R5C8 can only be <8>
R4C1 is the only square in row 4 that can be <8>
R6C7 is the only square in row 6 that can be <9>
R8C2 is the only square in row 8 that can be <8>
R3C6 is the only square in column 6 that can be <5>
R3C5 is the only square in row 3 that can be <8>
R4C4 is the only square in column 4 that can be <5>
R9C8 is the only square in column 8 that can be <9>
R6C5 is the only square in block 5 that can be <7>
R1C4 is the only square in row 1 that can be <7>
Squares R1C8 and R3C8 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R3C7 - removing <6> from <167> leaving <17>
   R3C9 - removing <6> from <167> leaving <17>
Squares R3C7 and R3C9 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C1 - removing <1> from <169> leaving <69>
   R3C3 - removing <1> from <1469> leaving <469>
Squares R3C1 and R8C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R6C1 - removing <6> from <126> leaving <12>
   R7C1 - removing <69> from <2679> leaving <27>
Squares R8C1 and R8C3 in block 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C2 - removing <6> from <56> leaving <5>
   R7C3 - removing <69> from <235679> leaving <2357>
   R9C2 - removing <6> from <16> leaving <1>
   R9C3 - removing <6> from <12367> leaving <1237>
R5C2 can only be <4>
R5C7 can only be <1>
R1C2 can only be <6>
R5C9 can only be <2>
R3C7 can only be <7>
R5C1 can only be <7>
R6C9 can only be <6>
R7C9 can only be <7>
R4C7 can only be <4>
R7C1 can only be <2>
R3C9 can only be <1>
R1C8 can only be <3>
R3C1 can only be <9>
R3C8 can only be <6>
R3C3 can only be <4>
R8C1 can only be <6>
R3C4 can only be <3>
R1C3 can only be <1>
R9C4 can only be <6>
R4C5 can only be <2>
R5C3 can only be <5>
R7C3 can only be <3>
R6C1 can only be <1>
R9C3 can only be <7>
R8C3 can only be <9>
R9C7 can only be <8>
R7C4 can only be <4>
R9C6 can only be <2>
R7C7 can only be <6>
R6C3 can only be <2>
R4C3 can only be <6>
R9C5 can only be <3>
R6C6 can only be <4>
R1C6 can only be <9>
R7C5 can only be <9>
R7C6 can only be <8>
R1C5 can only be <4>


 

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