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Sudoku Solution Path

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R3C2 is the only square in row 3 that can be <4>
R6C7 is the only square in row 6 that can be <5>
R7C7 is the only square in row 7 that can be <4>
R8C7 is the only square in row 8 that can be <3>
R5C6 is the only square in column 6 that can be <3>
R4C8 is the only square in column 8 that can be <1>
R1C8 is the only square in block 3 that can be <8>
R8C8 can only be <5>
R8C4 can only be <2>
R8C9 can only be <8>
R1C7 is the only square in row 1 that can be <9>
R3C4 is the only square in column 4 that can be <5>
Squares R3C7 and R3C9 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R3C3 - removing <2> from <123> leaving <13>
   R3C5 - removing <26> from <1236> leaving <13>
Squares R7C6 and R7C8 in row 7 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 row.
   R7C5 - removing <6> from <56> leaving <5>
R9C3 is the only square in row 9 that can be <5>
R2C1 is the only square in row 2 that can be <5>
R9C2 is the only square in row 9 that can be <8>
R2C2 can only be <6>
R2C6 can only be <2>
R2C3 can only be <8>
R6C5 is the only square in row 6 that can be <2>
R6C1 is the only square in row 6 that can be <8>
R5C5 is the only square in row 5 that can be <8>
R4C5 is the only square in column 5 that can be <7>
Squares R5C1 and R5C7 in row 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R5C3 - removing <7> from <179> leaving <19>
   R5C4 - removing <6> from <146> leaving <14>
   R5C9 - removing <67> from <4679> leaving <49>
Squares R5C7 and R6C9 in block 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R4C9 - removing <6> from <469> leaving <49>
Squares R4C9 and R5C9 in column 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R9C9 - removing <9> from <2679> leaving <267>
Squares R7C8 and R9C8 in block 9 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.
   R9C7 - removing <6> from <267> leaving <27>
   R9C9 - removing <6> from <267> leaving <27>
Squares R3C3<13>, R4C3<39> and R5C3<19> in column 3 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <139>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C3 - removing <13> from <1237> leaving <27>
Squares R7C1, R7C3, R1C1 and R1C3 form a Type-1 Unique Rectangle on <27>.
   R1C1 - removing <27> from <237> leaving <3>
R4C1 can only be <6>
R3C3 can only be <1>
R3C5 can only be <3>
R5C3 can only be <9>
R1C2 can only be <7>
R4C4 can only be <4>
R5C1 can only be <7>
R4C9 can only be <9>
R5C4 can only be <1>
R4C3 can only be <3>
R5C9 can only be <4>
R5C7 can only be <6>
R7C1 can only be <2>
R6C2 can only be <1>
R1C4 can only be <6>
R6C6 can only be <6>
R3C7 can only be <2>
R6C9 can only be <7>
R7C6 can only be <9>
R9C9 can only be <2>
R7C3 can only be <7>
R1C3 can only be <2>
R7C8 can only be <6>
R9C6 can only be <1>
R9C8 can only be <9>
R9C5 can only be <6>
R9C7 can only be <7>
R3C9 can only be <6>
R1C5 can only be <1>


 

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