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Sudoku Solution Path

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R4C2 can only be <8>
R2C9 is the only square in row 2 that can be <7>
R3C1 is the only square in row 3 that can be <8>
R4C5 is the only square in row 4 that can be <7>
R5C4 is the only square in row 5 that can be <6>
R8C2 is the only square in row 8 that can be <4>
R9C1 is the only square in row 9 that can be <7>
R9C2 is the only square in row 9 that can be <6>
R9C7 is the only square in column 7 that can be <5>
R9C3 can only be <3>
Squares R7C1 and R8C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C1 - removing <5> from <3569> leaving <369>
   R2C1 - removing <5> from <3569> leaving <369>
   R5C1 - removing <5> from <359> leaving <39>
Intersection of row 6 with block 5. The value <4> only appears in one or more of squares R6C4, R6C5 and R6C6 of row 6. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.
   R5C5 - removing <4> from <134589> leaving <13589>
   R5C6 - removing <4> from <1459> leaving <159>
R6C6 is the only square in column 6 that can be <4>
Intersection of row 9 with block 9. The value <2> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R7C9 - removing <2> from <12> leaving <1>
   R8C8 - removing <2> from <2389> leaving <389>
   R8C9 - removing <2> from <2389> leaving <389>
R7C5 can only be <5>
R7C1 can only be <2>
R8C1 can only be <5>
R9C5 is the only square in row 9 that can be <1>
Squares R8C4 and R8C6 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C8 - removing <9> from <389> leaving <38>
   R8C9 - removing <9> from <389> leaving <38>
Squares R4C4 and R8C4 in column 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C4 - removing <9> from <359> leaving <35>
   R6C4 - removing <9> from <359> leaving <35>
Squares R6C2 and R6C4 in row 6 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.
   R6C5 - removing <3> from <389> leaving <89>
Intersection of row 1 with block 1. The value <5> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R2C2 - removing <5> from <135> leaving <13>
Intersection of block 4 with row 5. The value <9> only appears in one or more of squares R5C1, R5C2 and R5C3 of block 4. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain this value.
   R5C5 - removing <9> from <389> leaving <38>
   R5C6 - removing <9> from <159> leaving <15>
   R5C9 - removing <9> from <489> leaving <48>
R9C9 is the only square in column 9 that can be <9>
R9C8 can only be <2>
R1C9 is the only square in row 1 that can be <2>
Squares R8C4, R8C6, R4C4 and R4C6 form a Type-1 Unique Rectangle on <29>.
   R4C6 - removing <29> from <129> leaving <1>
R4C8 can only be <9>
R5C6 can only be <5>
R4C4 can only be <2>
R6C8 can only be <8>
R5C3 can only be <9>
R2C6 can only be <9>
R6C4 can only be <3>
R6C2 can only be <5>
R2C4 can only be <5>
R5C5 can only be <8>
R6C5 can only be <9>
R8C8 can only be <3>
R5C9 can only be <4>
R8C9 can only be <8>
R8C6 can only be <2>
R8C4 can only be <9>
R5C1 can only be <3>
R1C3 can only be <5>
R5C7 can only be <1>
R3C9 can only be <3>
R3C5 can only be <4>
R2C1 can only be <6>
R1C7 can only be <4>
R1C5 can only be <3>
R2C8 can only be <1>
R1C1 can only be <9>
R2C2 can only be <3>
R1C8 can only be <6>
R1C2 can only be <1>


 

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