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Common Answers

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Sudoku Solution Path

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R4C9 can only be <4>
R6C9 can only be <9>
R7C5 can only be <5>
R5C7 can only be <6>
R7C2 can only be <6>
R5C5 can only be <4>
R6C5 can only be <2>
R2C1 is the only square in row 2 that can be <6>
R2C8 is the only square in row 2 that can be <8>
R3C5 is the only square in row 3 that can be <8>
R4C5 can only be <7>
R4C4 can only be <8>
R8C8 is the only square in row 8 that can be <6>
R9C2 is the only square in row 9 that can be <8>
R7C3 is the only square in column 3 that can be <2>
Squares R1C4 and R1C6 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R1C1 - removing <9> from <3459> leaving <345>
   R1C2 - removing <7> from <357> leaving <35>
   R1C8 - removing <9> from <2349> leaving <234>
   R1C9 - removing <7> from <257> leaving <25>
R8C1 is the only square in column 1 that can be <9>
Squares R2C2 and R2C9 in row 2 form a simple locked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R2C3 - removing <5> from <459> leaving <49>
   R2C7 - removing <7> from <479> leaving <49>
Squares R9C4 and R9C6 in row 9 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.
   R9C9 - removing <7> from <127> leaving <12>
Squares R3C8 and R7C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <39>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R1C8 - removing <3> from <234> leaving <24>
Intersection of row 1 with block 1. The value <3> only appears in one or more of squares R1C1, R1C2 and R1C3 of row 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
   R3C2 - removing <3> from <137> leaving <17>
R1C2 is the only square in column 2 that can be <3>
Squares R7C7, R7C8, R3C7 and R3C8 form a Type-1 Unique Rectangle on <39>.
   R3C7 - removing <39> from <379> leaving <7>
R3C2 can only be <1>
R8C7 can only be <4>
R2C9 can only be <5>
R2C7 can only be <9>
R9C8 can only be <2>
R9C9 can only be <1>
R1C8 can only be <4>
R9C1 can only be <4>
R8C9 can only be <7>
R1C1 can only be <5>
R2C3 can only be <4>
R7C7 can only be <3>
R3C8 can only be <3>
R2C2 can only be <7>
R1C9 can only be <2>
R3C3 can only be <9>
R8C2 can only be <5>
R7C8 can only be <9>
R8C3 can only be <1>
R5C3 can only be <5>
R6C1 can only be <3>
R5C4 can only be <9>
R5C6 can only be <1>
R1C4 can only be <7>
R4C6 can only be <3>
R6C6 can only be <6>
R4C1 can only be <1>
R6C4 can only be <5>
R9C6 can only be <7>
R9C4 can only be <6>
R1C6 can only be <9>


 

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