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Common Answers

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Sudoku Solution Path

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R3C3 can only be <2>
R4C4 can only be <8>
R8C5 can only be <1>
R3C5 can only be <3>
R3C7 can only be <7>
R1C4 can only be <2>
R9C4 can only be <7>
R6C4 can only be <5>
R5C4 can only be <1>
R4C6 is the only square in row 4 that can be <3>
R5C3 is the only square in row 5 that can be <8>
R9C3 can only be <6>
R7C3 can only be <5>
R7C7 can only be <6>
R1C3 can only be <9>
R5C7 can only be <5>
R5C8 can only be <7>
R1C7 can only be <3>
R9C7 can only be <9>
R6C6 is the only square in row 6 that can be <7>
R2C8 is the only square in column 8 that can be <9>
Squares R3C1 and R3C9 in row 3, R4C1 and R4C5 in row 4 and R7C5 and R7C9 in row 7 form a Swordfish pattern on possibility <4>. All other instances of this possibility in columns 1, 5 and 9 can be removed.
   R1C1 - removing <4> from <1456> leaving <156>
   R1C9 - removing <4> from <1458> leaving <158>
   R5C5 - removing <4> from <246> leaving <26>
   R9C9 - removing <4> from <24> leaving <2>
R9C2 can only be <1>
Squares R4C9, R6C9, R4C5 and R6C5 form a Type-4 Unique Rectangle on <69>.
   R4C5 - removing <6> from <469> leaving <49>
   R6C5 - removing <6> from <269> leaving <29>
Intersection of block 5 with row 5. The value <6> only appears in one or more of squares R5C4, R5C5 and R5C6 of block 5. These squares are the ones that intersect with row 5. Thus, the other (non-intersecting) squares of row 5 cannot contain this value.
   R5C2 - removing <6> from <246> leaving <24>
Intersection of column 2 with block 1. The value <6> only appears in one or more of squares R1C2, R2C2 and R3C2 of column 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 <6> from <156> leaving <15>
   R2C1 - removing <6> from <567> leaving <57>
Squares R1C1 (XY), R3C1 (XZ) and R1C8 (YZ) form an XY-Wing pattern on <4>. All squares that are buddies of both the XZ and YZ squares cannot be <4>.
   R1C2 - removing <4> from <46> leaving <6>
   R3C9 - removing <4> from <14> leaving <1>
R1C6 can only be <8>
R2C2 can only be <7>
R9C6 can only be <4>
R2C5 can only be <6>
R2C1 can only be <5>
R8C2 can only be <2>
R5C5 can only be <2>
R3C1 can only be <4>
R1C9 can only be <5>
R5C2 can only be <4>
R6C5 can only be <9>
R6C9 can only be <6>
R4C5 can only be <4>
R6C1 can only be <2>
R4C9 can only be <9>
R9C8 can only be <3>
R5C6 can only be <6>
R7C5 can only be <8>
R9C1 can only be <8>
R8C8 can only be <5>
R1C1 can only be <1>
R1C8 can only be <4>
R2C9 can only be <8>
R8C9 can only be <7>
R4C1 can only be <6>
R7C1 can only be <7>
R8C1 can only be <3>
R7C9 can only be <4>


 

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