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Common Answers

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Sudoku Solution Path

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R5C5 can only be <1>
R7C6 can only be <9>
R3C5 can only be <3>
R7C4 can only be <4>
R8C6 can only be <3>
R8C4 can only be <8>
R2C6 can only be <6>
R3C6 can only be <5>
R1C5 can only be <4>
R7C5 can only be <7>
R9C5 can only be <2>
R1C9 is the only square in row 1 that can be <5>
R4C1 is the only square in row 4 that can be <8>
R1C2 is the only square in row 1 that can be <8>
R5C7 is the only square in row 5 that can be <2>
R6C3 is the only square in row 6 that can be <5>
R9C2 is the only square in row 9 that can be <5>
R9C7 is the only square in row 9 that can be <8>
Squares R2C2 and R2C4 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <19>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R2C3 - removing <19> from <1379> leaving <37>
   R2C7 - removing <19> from <13479> leaving <347>
   R2C8 - removing <19> from <1349> leaving <34>
Squares R6C9 and R7C9 in column 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <16>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R3C9 - removing <1> from <179> leaving <79>
   R4C9 - removing <1> from <139> leaving <39>
Intersection of block 3 with row 1. The value <1> only appears in one or more of squares R1C7, R1C8 and R1C9 of block 3. These squares are the ones that intersect with row 1. Thus, the other (non-intersecting) squares of row 1 cannot contain this value.
   R1C1 - removing <1> from <169> leaving <69>
   R1C3 - removing <1> from <1369> leaving <369>
Squares R6C1 and R6C9 in row 6 and R7C1 and R7C9 in row 7 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in columns 1 and 9 can be removed.
   R1C1 - removing <6> from <69> leaving <9>
R2C2 can only be <1>
R2C4 can only be <9>
R3C1 can only be <7>
R3C4 can only be <1>
R3C9 can only be <9>
R9C1 can only be <4>
R2C3 can only be <3>
R4C9 can only be <3>
R9C9 can only be <7>
R9C3 can only be <9>
R2C8 can only be <4>
R1C3 can only be <6>
R2C7 can only be <7>
R9C8 can only be <3>
R4C3 can only be <1>
R8C2 can only be <6>
R1C8 can only be <1>
R5C3 can only be <4>
R1C7 can only be <3>
R4C7 can only be <9>
R8C3 can only be <7>
R6C1 can only be <6>
R8C7 can only be <1>
R5C8 can only be <6>
R5C2 can only be <9>
R8C8 can only be <9>
R6C9 can only be <1>
R7C1 can only be <1>
R6C7 can only be <4>
R7C9 can only be <6>


 

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