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Sudoku Solution Path

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Copyright © Kevin Stone

R1C2 can only be <3>
R1C3 can only be <9>
R5C1 is the only square in row 5 that can be <9>
R5C3 is the only square in row 5 that can be <3>
R7C9 is the only square in row 7 that can be <9>
R2C7 is the only square in row 2 that can be <9>
R8C4 is the only square in row 8 that can be <9>
R4C3 is the only square in column 3 that can be <2>
R3C7 is the only square in column 7 that can be <3>
R2C4 is the only square in column 4 that can be <3>
R9C4 is the only square in column 4 that can be <8>
Squares R2C2 and R3C2 in column 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R5C2 - removing <17> from <1478> leaving <48>
   R8C2 - removing <17> from <1478> leaving <48>
Squares R4C7 and R9C7 in column 7 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R5C7 - removing <17> from <1678> leaving <68>
   R6C7 - removing <17> from <1678> leaving <68>
Squares R2C2 and R3C2 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <17>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R2C1 - removing <17> from <1257> leaving <25>
   R3C1 - removing <17> from <1257> leaving <25>
Squares R5C7 and R6C7 in block 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R5C8 - removing <68> from <12568> leaving <125>
   R5C9 - removing <68> from <1245678> leaving <12457>
   R6C9 - removing <68> from <14678> leaving <147>
R6C7 is the only square in row 6 that can be <6>
R5C7 can only be <8>
R5C2 can only be <4>
R8C2 can only be <8>
R6C1 is the only square in row 6 that can be <8>
R7C8 is the only square in row 7 that can be <8>
R7C3 is the only square in row 7 that can be <6>
R4C4 is the only square in column 4 that can be <4>
R4C9 is the only square in row 4 that can be <5>
R1C9 can only be <8>
R2C6 is the only square in row 2 that can be <8>
R6C9 is the only square in row 6 that can be <4>
R8C6 is the only square in column 6 that can be <2>
R9C8 is the only square in row 9 that can be <2>
R5C8 can only be <1>
R8C8 can only be <6>
R4C7 can only be <7>
R2C8 can only be <5>
R2C1 can only be <2>
R4C1 can only be <1>
R9C7 can only be <1>
R5C9 can only be <2>
R9C5 can only be <4>
R8C9 can only be <7>
R3C1 can only be <5>
R3C4 can only be <6>
R3C9 can only be <1>
R5C4 can only be <5>
R2C5 can only be <7>
R3C2 can only be <7>
R2C9 can only be <6>
R7C1 can only be <3>
R6C3 can only be <7>
R5C6 can only be <7>
R5C5 can only be <6>
R6C6 can only be <1>
R8C3 can only be <1>
R7C6 can only be <5>
R7C5 can only be <1>
R1C6 can only be <4>
R8C1 can only be <4>
R9C1 can only be <7>
R1C5 can only be <5>
R8C5 can only be <3>
R2C2 can only be <1>
R3C5 can only be <2>

 

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