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Sudoku Solution Path

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R2C7 is the only square in row 2 that can be <1>
R5C2 is the only square in row 5 that can be <4>
R5C6 is the only square in row 5 that can be <2>
R6C5 is the only square in row 6 that can be <3>
R1C3 is the only square in column 3 that can be <8>
R5C4 is the only square in column 4 that can be <8>
R2C8 is the only square in column 8 that can be <8>
R2C9 is the only square in column 9 that can be <2>
R7C2 is the only square in column 2 that can be <2>
R9C2 is the only square in column 2 that can be <7>
R1C9 is the only square in column 9 that can be <3>
Squares R1C1 and R2C1 in column 1 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 column.
   R3C1 - removing <4> from <234> leaving <23>
   R4C1 - removing <6> from <167> leaving <17>
   R6C1 - removing <6> from <267> leaving <27>
   R8C1 - removing <46> from <13456> leaving <135>
   R9C1 - removing <46> from <456> leaving <5>
Squares R1C1 and R2C1 in block 1 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.
   R2C2 - removing <6> from <69> leaving <9>
   R3C3 - removing <4> from <2349> leaving <239>
R8C2 can only be <6>
R5C8 is the only square in column 8 that can be <6>
R5C5 can only be <7>
R3C4 is the only square in column 4 that can be <7>
R1C8 is the only square in column 8 that can be <7>
Squares R8C4 and R8C8 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C3 - removing <9> from <1349> leaving <134>
   R8C9 - removing <59> from <459> leaving <4>
R9C3 is the only square in row 9 that can be <4>
R7C3 can only be <9>
Intersection of block 2 with column 6. The value <6> only appears in one or more of squares R1C6, R2C6 and R3C6 of block 2. These squares are the ones that intersect with column 6. Thus, the other (non-intersecting) squares of column 6 cannot contain this value.
   R4C6 - removing <6> from <569> leaving <59>
   R7C6 - removing <6> from <456> leaving <45>
Intersection of block 8 with column 4. The value <9> only appears in one or more of squares R7C4, R8C4 and R9C4 of block 8. These squares are the ones that intersect with column 4. Thus, the other (non-intersecting) squares of column 4 cannot contain this value.
   R6C4 - removing <9> from <569> leaving <56>
Intersection of row 6 with block 6. The value <9> only appears in one or more of squares R6C7, R6C8 and R6C9 of row 6. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R4C7 - removing <9> from <5789> leaving <578>
   R4C9 - removing <9> from <5789> leaving <578>
Squares R2C1, R2C6, R1C1 and R1C6 form a Type-1 Unique Rectangle on <46>.
   R1C6 - removing <46> from <469> leaving <9>
R1C7 can only be <4>
R4C6 can only be <5>
R3C5 can only be <4>
R1C1 can only be <6>
R7C5 can only be <6>
R2C6 can only be <6>
R7C6 can only be <4>
R6C4 can only be <6>
R6C3 can only be <2>
R9C4 can only be <9>
R4C5 can only be <9>
R9C9 can only be <8>
R8C4 can only be <5>
R9C7 can only be <6>
R4C9 can only be <7>
R2C1 can only be <4>
R4C1 can only be <1>
R4C7 can only be <8>
R7C9 can only be <5>
R6C1 can only be <7>
R3C3 can only be <3>
R7C7 can only be <7>
R6C9 can only be <9>
R8C8 can only be <9>
R3C8 can only be <5>
R3C1 can only be <2>
R8C3 can only be <1>
R3C7 can only be <9>
R4C3 can only be <6>
R8C1 can only be <3>
R6C7 can only be <5>


 

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