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Common Answers

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Sudoku Solution Path

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R6C1 is the only square in row 6 that can be <9>
R7C5 is the only square in row 7 that can be <7>
R8C5 is the only square in row 8 that can be <1>
R9C4 can only be <3>
R1C4 can only be <5>
R5C4 can only be <1>
R3C2 is the only square in column 2 that can be <9>
Squares R8C2 and R8C3 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R8C7 - removing <4> from <249> leaving <29>
Squares R9C5 and R9C6 in row 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R9C1 - removing <2> from <1258> leaving <158>
   R9C7 - removing <29> from <2489> leaving <48>
   R9C9 - removing <2> from <12458> leaving <1458>
R7C1 is the only square in column 1 that can be <2>
R7C9 is the only square in row 7 that can be <1>
R9C1 is the only square in row 9 that can be <1>
R1C1 is the only square in column 1 that can be <8>
R7C2 is the only square in column 2 that can be <8>
R7C8 can only be <5>
R9C3 is the only square in row 9 that can be <5>
R2C2 is the only square in row 2 that can be <5>
Squares R1C7<47>, R2C7<78> and R9C7<48> in column 7 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <478>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R5C7 - removing <78> from <2789> leaving <29>
R5C9 is the only square in row 5 that can be <7>
Squares R8C2, R8C3, R5C2 and R5C3 form a Type-1 Unique Rectangle on <34>.
   R5C3 - removing <34> from <346> leaving <6>
R1C5 is the only square in row 1 that can be <6>
R2C5 can only be <3>
R2C3 can only be <7>
R3C5 can only be <4>
R1C6 can only be <9>
R9C6 can only be <2>
R2C7 can only be <8>
R1C3 can only be <3>
R2C8 can only be <6>
R9C7 can only be <4>
R3C8 can only be <2>
R3C9 can only be <3>
R8C8 can only be <9>
R3C1 can only be <6>
R1C9 can only be <4>
R8C7 can only be <2>
R5C8 can only be <8>
R9C5 can only be <9>
R5C6 can only be <3>
R9C9 can only be <8>
R1C7 can only be <7>
R4C9 can only be <5>
R8C3 can only be <4>
R4C1 can only be <3>
R4C5 can only be <8>
R6C9 can only be <2>
R5C1 can only be <5>
R5C2 can only be <4>
R6C5 can only be <5>
R5C7 can only be <9>
R8C2 can only be <3>
R5C5 can only be <2>


 

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