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Common Answers

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Sudoku Solution Path

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R4C2 can only be <1>
R4C5 can only be <6>
R6C2 can only be <8>
R6C5 can only be <2>
R5C5 can only be <3>
R4C1 is the only square in row 4 that can be <4>
R5C9 is the only square in row 5 that can be <1>
R5C7 is the only square in row 5 that can be <8>
R5C3 is the only square in row 5 that can be <7>
R4C3 can only be <9>
R4C8 can only be <7>
R5C1 can only be <2>
R3C1 is the only square in block 1 that can be <1>
Intersection of row 8 with block 8. The value <4> only appears in one or more of squares R8C4, R8C5 and R8C6 of row 8. These squares are the ones that intersect with block 8. Thus, the other (non-intersecting) squares of block 8 cannot contain this value.
   R9C4 - removing <4> from <12346> leaving <1236>
   R9C6 - removing <4> from <23456> leaving <2356>
Intersection of block 1 with row 1. The value <8> only appears in one or more of squares R1C1, R1C2 and R1C3 of block 1. These squares are the ones that intersect with row 1. Thus, the other (non-intersecting) squares of row 1 cannot contain this value.
   R1C4 - removing <8> from <3689> leaving <369>
   R1C9 - removing <8> from <5689> leaving <569>
Squares R6C9<459>, R7C9<59> and R9C9<45> in column 9 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <459>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C9 - removing <59> from <569> leaving <6>
   R2C9 - removing <59> from <25689> leaving <268>
R1C3 can only be <8>
R1C1 can only be <3>
R7C3 can only be <1>
R1C4 can only be <9>
R9C1 can only be <5>
R2C2 can only be <6>
R5C4 can only be <4>
R8C2 can only be <3>
R5C6 can only be <9>
R9C9 can only be <4>
R9C7 can only be <3>
R3C7 can only be <7>
R3C5 can only be <8>
R1C7 can only be <5>
R1C6 can only be <7>
R2C7 can only be <9>
R2C8 can only be <3>
R6C7 can only be <4>
R3C9 can only be <2>
R8C5 can only be <5>
R2C9 can only be <8>
R8C8 can only be <9>
R2C5 can only be <1>
R7C5 can only be <7>
R8C1 can only be <8>
R6C8 can only be <5>
R7C9 can only be <5>
R7C6 can only be <3>
R2C4 can only be <2>
R6C9 can only be <9>
R7C4 can only be <8>
R3C6 can only be <6>
R7C1 can only be <9>
R2C6 can only be <5>
R8C4 can only be <6>
R3C4 can only be <3>
R9C6 can only be <2>
R8C3 can only be <2>
R9C4 can only be <1>
R9C3 can only be <6>
R8C6 can only be <4>


 

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