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Common Answers

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Sudoku Solution Path

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R6C9 can only be <1>
R2C9 can only be <3>
R2C7 is the only square in row 2 that can be <8>
R2C3 is the only square in row 2 that can be <9>
R3C5 is the only square in row 3 that can be <4>
R6C2 is the only square in row 6 that can be <9>
R8C3 is the only square in row 8 that can be <8>
R8C7 is the only square in row 8 that can be <9>
R3C7 can only be <2>
R1C8 can only be <1>
R3C8 can only be <9>
Squares R3C2 and R3C3 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <15>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R2C1 - removing <5> from <257> leaving <27>
Intersection of row 8 with block 8. The value <1> 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.
   R7C5 - removing <1> from <1235> leaving <235>
Squares R5C2 and R5C7 in row 5 and R7C2 and R7C7 in row 7 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 2 and 7 can be removed.
   R4C2 - removing <4> from <2458> leaving <258>
   R9C2 - removing <4> from <45> leaving <5>
R3C2 can only be <1>
R3C3 can only be <5>
R5C3 can only be <2>
R7C3 can only be <1>
R4C2 can only be <8>
R5C8 is the only square in row 5 that can be <8>
R9C4 is the only square in row 9 that can be <4>
Intersection of row 5 with block 5. The values <36> only appears in one or more of squares R5C4, R5C5 and R5C6 of row 5. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain these values.
   R4C5 - removing <6> from <256> leaving <25>
Intersection of row 8 with block 8. The values <15> 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 these values.
   R7C5 - removing <5> from <235> leaving <23>
Intersection of block 5 with column 5. The value <2> only appears in one or more of squares R4C5, R5C5 and R6C5 of block 5. These squares are the ones that intersect with column 5. Thus, the other (non-intersecting) squares of column 5 cannot contain this value.
   R2C5 - removing <2> from <1257> leaving <157>
   R7C5 - removing <2> from <23> leaving <3>
   R8C5 - removing <2> from <1256> leaving <156>
R7C8 can only be <5>
R9C6 can only be <6>
R7C7 can only be <4>
R6C8 can only be <2>
R9C8 can only be <3>
R4C8 can only be <6>
R7C2 can only be <2>
R5C7 can only be <5>
R8C9 can only be <6>
R4C9 can only be <4>
R4C1 can only be <5>
R5C4 can only be <3>
R1C2 can only be <7>
R8C1 can only be <4>
R5C2 can only be <4>
R2C1 can only be <2>
R4C5 can only be <2>
R6C1 can only be <7>
R5C6 can only be <7>
R1C4 can only be <2>
R5C5 can only be <6>
R2C6 can only be <5>
R6C5 can only be <5>
R8C5 can only be <1>
R2C5 can only be <7>
R1C6 can only be <3>
R8C4 can only be <5>
R2C4 can only be <1>
R8C6 can only be <2>


 

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