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Sudoku Solution Path

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R2C2 can only be <9>
R5C5 can only be <7>
R9C1 can only be <1>
R8C2 can only be <5>
R1C1 can only be <2>
R3C3 can only be <8>
R8C8 can only be <4>
R7C3 can only be <9>
R5C1 can only be <3>
R6C3 can only be <2>
R6C8 can only be <8>
R6C2 can only be <4>
R5C2 can only be <6>
R4C2 can only be <8>
R5C8 is the only square in row 5 that can be <2>
R5C9 is the only square in row 5 that can be <4>
R6C9 is the only square in row 6 that can be <3>
Squares R1C6 and R1C9 in row 1 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.
   R1C5 - removing <59> from <3589> leaving <38>
Squares R3C5 and R3C7 in row 3 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.
   R3C4 - removing <6> from <146> leaving <14>
   R3C6 - removing <9> from <149> leaving <14>
Squares R9C6 and R9C9 in row 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R9C4 - removing <7> from <678> leaving <68>
   R9C5 - removing <5> from <568> leaving <68>
Squares R1C5<38>, R3C5<69>, R8C5<39> and R9C5<68> in column 5 form a comprehensive locked quad. These 4 squares can only contain the 4 possibilities <3689>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C5 - removing <6> from <256> leaving <25>
Squares R1C6 and R1C9 in row 1 and R9C6 and R9C9 in row 9 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 6 and 9 can be removed.
   R2C6 - removing <5> from <257> leaving <27>
   R4C9 - removing <5> from <579> leaving <79>
   R7C6 - removing <5> from <2457> leaving <247>
Squares R4C1 and R4C9 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R4C7 - removing <79> from <15679> leaving <156>
Squares R5C3, R5C7, R4C3 and R4C7 form a Type-1 Unique Rectangle on <15>.
   R4C7 - removing <15> from <156> leaving <6>
R4C8 can only be <5>
R3C7 can only be <9>
R4C3 can only be <1>
R2C8 can only be <6>
R5C7 can only be <1>
R5C3 can only be <5>
R2C4 can only be <7>
R3C5 can only be <6>
R6C7 can only be <7>
R1C9 can only be <5>
R6C1 can only be <9>
R7C7 can only be <5>
R4C9 can only be <9>
R7C5 can only be <2>
R9C9 can only be <7>
R9C6 can only be <5>
R1C6 can only be <9>
R2C6 can only be <2>
R7C4 can only be <4>
R2C5 can only be <5>
R9C5 can only be <8>
R4C1 can only be <7>
R7C6 can only be <7>
R3C4 can only be <1>
R9C4 can only be <6>
R1C5 can only be <3>
R1C4 can only be <8>
R8C5 can only be <9>
R8C6 can only be <1>
R3C6 can only be <4>
R8C4 can only be <3>


 

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