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Sudoku Solution Path

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R1C7 can only be <7>
R4C2 can only be <4>
R5C7 is the only square in row 5 that can be <2>
R5C1 is the only square in row 5 that can be <7>
R1C2 is the only square in column 2 that can be <2>
R7C3 is the only square in column 3 that can be <4>
R7C6 can only be <3>
R7C2 is the only square in row 7 that can be <1>
R3C3 is the only square in column 3 that can be <1>
R9C7 is the only square in column 7 that can be <6>
R1C8 is the only square in column 8 that can be <4>
R5C9 is the only square in column 9 that can be <5>
R4C8 can only be <8>
R4C5 can only be <5>
Squares R2C1 and R2C9 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R2C4 - removing <3> from <234> leaving <24>
   R2C5 - removing <3> from <1234> leaving <124>
Squares R8C1 and R8C9 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <38>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C4 - removing <8> from <48> leaving <4>
   R8C5 - removing <8> from <4689> leaving <469>
R2C4 can only be <2>
R7C5 is the only square in row 7 that can be <2>
Squares R8C5 and R8C6 in block 8 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.
   R9C5 - removing <9> from <789> leaving <78>
Squares R2C5, R2C6, R5C5 and R5C6 form a Type-1 Unique Rectangle on <14>.
   R5C5 - removing <14> from <1348> leaving <38>
R5C6 is the only square in row 5 that can be <4>
R2C6 can only be <1>
R2C5 can only be <4>
R5C8 is the only square in row 5 that can be <1>
R6C8 can only be <9>
R6C2 can only be <3>
R6C5 can only be <1>
Squares R8C5, R8C6, R3C5 and R3C6 form a Type-1 Unique Rectangle on <69>.
   R3C5 - removing <69> from <3679> leaving <37>
R3C6 is the only square in row 3 that can be <9>
R8C6 can only be <6>
R8C5 can only be <9>
R3C2 is the only square in row 3 that can be <6>
R5C2 can only be <9>
R1C3 can only be <3>
R5C3 can only be <6>
R9C2 can only be <8>
R9C5 can only be <7>
R8C1 can only be <3>
R9C8 can only be <3>
R3C5 can only be <3>
R7C4 can only be <8>
R9C3 can only be <9>
R3C8 can only be <5>
R8C9 can only be <8>
R1C5 can only be <6>
R2C1 can only be <8>
R2C9 can only be <3>
R3C4 can only be <7>
R5C5 can only be <8>
R3C7 can only be <8>
R7C8 can only be <7>
R5C4 can only be <3>
R7C7 can only be <5>

 

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