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Common Answers

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Sudoku Solution Path

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R2C5 is the only square in row 2 that can be <3>
R2C3 is the only square in row 2 that can be <9>
R3C4 is the only square in row 3 that can be <9>
R6C3 is the only square in row 6 that can be <1>
R7C9 is the only square in row 7 that can be <9>
R6C7 is the only square in row 6 that can be <9>
R3C5 is the only square in column 5 that can be <4>
R3C6 is the only square in row 3 that can be <1>
R1C7 is the only square in row 1 that can be <1>
R7C5 is the only square in row 7 that can be <1>
R9C6 is the only square in column 6 that can be <2>
Squares R1C4 and R1C6 in row 1 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 row.
   R1C1 - removing <6> from <256> leaving <25>
   R1C9 - removing <6> from <2456> leaving <245>
R3C1 is the only square in column 1 that can be <6>
R3C8 can only be <2>
R6C9 is the only square in column 9 that can be <2>
R6C4 is the only square in row 6 that can be <4>
R1C1 is the only square in column 1 that can be <2>
Squares R5C5 and R5C8 in row 5 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 row.
   R5C2 - removing <8> from <2578> leaving <257>
   R5C7 - removing <68> from <568> leaving <5>
Squares R5C2 and R5C3 in block 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <27>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R4C1 - removing <7> from <3578> leaving <358>
   R4C3 - removing <7> from <357> leaving <35>
Intersection of column 1 with block 7. The value <7> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R7C2 - removing <7> from <4578> leaving <458>
   R8C2 - removing <7> from <278> leaving <28>
   R8C3 - removing <7> from <237> leaving <23>
   R9C3 - removing <7> from <347> leaving <34>
R8C7 is the only square in row 8 that can be <7>
R2C2 is the only square in row 2 that can be <7>
R3C2 can only be <5>
R5C2 can only be <2>
R3C9 can only be <7>
R1C3 can only be <4>
R5C3 can only be <7>
R8C2 can only be <8>
R8C5 can only be <6>
R7C2 can only be <4>
R8C8 can only be <3>
R5C5 can only be <8>
R8C3 can only be <2>
R1C9 can only be <5>
R9C3 can only be <3>
R5C8 can only be <6>
R6C6 can only be <3>
R2C8 can only be <4>
R4C9 can only be <4>
R6C1 can only be <8>
R7C8 can only be <8>
R7C6 can only be <7>
R9C1 can only be <7>
R4C3 can only be <5>
R2C7 can only be <6>
R4C7 can only be <8>
R9C9 can only be <6>
R4C1 can only be <3>
R7C1 can only be <5>
R7C4 can only be <3>
R4C6 can only be <6>
R9C4 can only be <8>
R1C4 can only be <6>
R9C7 can only be <4>
R1C6 can only be <8>
R4C4 can only be <7>


 

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