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Sudoku Solution Path

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R1C4 is the only square in row 1 that can be <4>
R2C3 is the only square in row 2 that can be <4>
R5C8 is the only square in row 5 that can be <7>
R1C5 is the only square in row 1 that can be <7>
R8C8 is the only square in row 8 that can be <4>
R5C4 is the only square in column 4 that can be <1>
R7C4 is the only square in column 4 that can be <7>
R6C7 is the only square in block 6 that can be <2>
Squares R4C1 and R6C1 in column 1 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.
   R2C1 - removing <16> from <1679> leaving <79>
   R5C1 - removing <6> from <26> leaving <2>
Squares R4C1 and R6C1 in block 4 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.
   R4C3 - removing <1> from <158> leaving <58>
   R5C2 - removing <6> from <3568> leaving <358>
   R6C3 - removing <1> from <13> leaving <3>
R3C3 can only be <7>
R2C1 can only be <9>
R8C1 can only be <7>
R2C7 is the only square in row 2 that can be <7>
R7C3 is the only square in column 3 that can be <1>
Squares R4C7 and R5C9 in block 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R4C9 - removing <56> from <1569> leaving <19>
   R6C9 - removing <6> from <169> leaving <19>
Squares R4C9 and R6C9 in column 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C9 - removing <1> from <136> leaving <36>
   R8C9 - removing <9> from <359> leaving <35>
Intersection of row 9 with block 8. The value <3> only appears in one or more of squares R9C4, R9C5 and R9C6 of row 9. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R8C5 - removing <3> from <23589> leaving <2589>
Intersection of block 5 with column 5. The value <9> only appears in one or more of squares R4C5, R5C5 and R6C5 of block 5. These squares are the ones that intersect with column 5. Thus, the other (non-intersecting) squares of column 5 cannot contain this value.
   R8C5 - removing <9> from <2589> leaving <258>
   R9C5 - removing <9> from <23589> leaving <2358>
R8C2 is the only square in row 8 that can be <9>
R8C5 is the only square in row 8 that can be <2>
R2C8 is the only square in row 2 that can be <2>
R2C2 is the only square in row 2 that can be <1>
R1C8 is the only square in row 1 that can be <1>
R3C6 is the only square in row 3 that can be <2>
R3C4 is the only square in row 3 that can be <9>
R9C4 can only be <3>
R9C2 is the only square in row 9 that can be <2>
R9C5 is the only square in column 5 that can be <5>
R9C8 can only be <9>
R9C6 can only be <8>
R7C6 can only be <9>
Squares R2C9 and R5C6 form a remote locked pair. <36> can be removed from any square that is common to their groups.
   R5C9 - removing <6> from <56> leaving <5>
R5C2 can only be <8>
R8C9 can only be <3>
R4C7 can only be <6>
R2C9 can only be <6>
R2C5 can only be <3>
R3C8 can only be <5>
R3C7 can only be <3>
R7C8 can only be <6>
R4C1 can only be <1>
R7C2 can only be <5>
R4C3 can only be <5>
R7C7 can only be <8>
R8C3 can only be <8>
R8C7 can only be <5>
R5C5 can only be <6>
R1C6 can only be <6>
R3C2 can only be <6>
R4C9 can only be <9>
R6C1 can only be <6>
R4C5 can only be <8>
R6C9 can only be <1>
R5C6 can only be <3>
R6C5 can only be <9>
R1C2 can only be <3>


 

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