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Sudoku Solution Path

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R1C9 is the only square in row 1 that can be <2>
R9C9 can only be <9>
R8C9 can only be <4>
R3C9 can only be <1>
R5C9 can only be <5>
R1C5 is the only square in row 1 that can be <8>
R9C1 is the only square in row 9 that can be <7>
Squares R1C1 and R1C4 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R1C2 - removing <14> from <1347> leaving <37>
   R1C3 - removing <1> from <137> leaving <37>
Squares R3C7 and R3C8 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C3 - removing <6> from <356> leaving <35>
   R3C5 - removing <4> from <3459> leaving <359>
R2C3 is the only square in block 1 that can be <6>
R4C3 can only be <9>
R7C1 is the only square in column 1 that can be <9>
R5C1 is the only square in column 1 that can be <8>
R3C3 is the only square in column 3 that can be <5>
R6C5 is the only square in column 5 that can be <5>
Squares R7C5 and R9C5 in column 5 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 column.
   R4C5 - removing <6> from <346> leaving <34>
   R5C5 - removing <16> from <13469> leaving <349>
Squares R3C7 and R3C8 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <46>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R2C7 - removing <4> from <478> leaving <78>
   R2C8 - removing <4> from <478> leaving <78>
Squares R7C5 and R9C5 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.
   R7C4 - removing <16> from <126> leaving <2>
   R9C6 - removing <1> from <128> leaving <28>
R9C6 can only be <8>
R4C8 is the only square in row 4 that can be <2>
R9C8 can only be <6>
R9C5 can only be <1>
R9C7 can only be <2>
R3C8 can only be <4>
R3C7 can only be <6>
R6C8 can only be <7>
R2C8 can only be <8>
R5C8 can only be <3>
R7C5 can only be <6>
R2C7 can only be <7>
R4C5 is the only square in row 4 that can be <3>
R3C5 can only be <9>
R3C6 can only be <3>
R5C5 can only be <4>
R5C7 can only be <9>
R4C4 can only be <6>
R6C7 can only be <4>
R6C2 can only be <1>
R4C2 can only be <4>
R5C4 can only be <1>
R5C3 can only be <7>
R5C6 can only be <2>
R1C4 can only be <4>
R6C6 can only be <9>
R7C2 can only be <3>
R8C6 can only be <5>
R7C7 can only be <8>
R1C2 can only be <7>
R8C2 can only be <2>
R8C3 can only be <8>
R7C3 can only be <1>
R8C7 can only be <3>
R8C4 can only be <9>
R2C6 can only be <1>
R1C3 can only be <3>
R5C2 can only be <6>
R1C1 can only be <1>
R2C4 can only be <5>
R2C1 can only be <4>

 

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