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Common Answers

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Sudoku Solution Path

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R3C6 is the only square in row 3 that can be <3>
R7C6 can only be <6>
R7C8 can only be <4>
R9C8 can only be <2>
R9C6 can only be <7>
R7C7 is the only square in row 7 that can be <3>
R8C5 is the only square in row 8 that can be <2>
R9C5 is the only square in row 9 that can be <3>
R9C1 is the only square in row 9 that can be <4>
R9C2 is the only square in row 9 that can be <5>
Squares R3C4 and R3C8 in row 3 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.
   R3C2 - removing <6> from <269> leaving <29>
   R3C7 - removing <67> from <4679> leaving <49>
Squares R7C4 and R9C4 in column 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C4 - removing <8> from <5678> leaving <567>
Intersection of row 2 with block 1. The value <5> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R1C1 - removing <5> from <1569> leaving <169>
Intersection of column 7 with block 6. The value <7> only appears in one or more of squares R4C7, R5C7 and R6C7 of column 7. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.
   R5C8 - removing <7> from <167> leaving <16>
Squares R2C1, R2C7 and R2C9 in row 2, R4C1, R4C7 and R4C9 in row 4 and R8C7 and R8C9 in row 8 form a Swordfish pattern on possibility <6>. All other instances of this possibility in columns 1, 7 and 9 can be removed.
   R1C1 - removing <6> from <169> leaving <19>
   R1C9 - removing <6> from <14689> leaving <1489>
   R5C1 - removing <6> from <167> leaving <17>
   R5C9 - removing <6> from <1246> leaving <124>
Squares R1C1<19>, R5C1<17> and R8C1<79> in column 1 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <179>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C1 - removing <1> from <156> leaving <56>
   R4C1 - removing <17> from <13567> leaving <356>
   R6C1 - removing <17> from <1357> leaving <35>
Squares R1C1 and R5C1 in column 1 and R1C8 and R5C8 in column 8 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in rows 1 and 5 can be removed.
   R1C2 - removing <1> from <169> leaving <69>
   R5C2 - removing <1> from <126> leaving <26>
   R1C9 - removing <1> from <1489> leaving <489>
   R5C9 - removing <1> from <124> leaving <24>
R7C2 is the only square in column 2 that can be <1>
R7C3 can only be <8>
R7C4 can only be <9>
R8C3 can only be <7>
R9C4 can only be <8>
R8C1 can only be <9>
R9C9 can only be <9>
R1C1 can only be <1>
R5C1 can only be <7>
R5C5 can only be <4>
R5C9 can only be <2>
R2C5 can only be <8>
R5C2 can only be <6>
R1C5 can only be <7>
R5C8 can only be <1>
R1C2 can only be <9>
R3C2 can only be <2>
R1C8 can only be <6>
R3C4 can only be <6>
R1C4 can only be <5>
R3C8 can only be <7>
R2C7 can only be <4>
R2C3 can only be <5>
R2C9 can only be <1>
R3C7 can only be <9>
R6C7 can only be <7>
R1C9 can only be <8>
R3C3 can only be <4>
R4C7 can only be <6>
R1C6 can only be <4>
R6C4 can only be <1>
R8C9 can only be <6>
R2C1 can only be <6>
R4C9 can only be <3>
R8C7 can only be <8>
R4C1 can only be <5>
R6C9 can only be <4>
R6C3 can only be <2>
R4C4 can only be <7>
R4C6 can only be <2>
R6C1 can only be <3>
R4C3 can only be <1>
R6C6 can only be <5>


 

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