[X]

Privacy Policy + T&C

We use cookies to personalise our content and ads, and for traffic analysis. Information about your use of our site is shared with our advertising and analytics providers. You also agree to our T&C.

[X]

Common Answers

Have you entered September's Common Answers?

BB Logo
Spacer
Line
Line
Sudoku Solution Path

? ?

R2C6 can only be <5>
R4C8 can only be <3>
R5C1 can only be <4>
R6C6 can only be <2>
R8C4 can only be <3>
R2C4 can only be <9>
R4C6 can only be <4>
R8C6 can only be <6>
R5C5 can only be <9>
R4C2 can only be <8>
R5C9 can only be <2>
R1C5 can only be <3>
R6C4 can only be <8>
R9C9 can only be <8>
R6C8 can only be <9>
R6C2 can only be <3>
R4C4 can only be <5>
R9C5 can only be <4>
R2C3 is the only square in row 2 that can be <8>
R3C9 is the only square in row 3 that can be <6>
R3C7 is the only square in row 3 that can be <7>
R7C3 is the only square in row 7 that can be <6>
R7C2 is the only square in row 7 that can be <7>
Squares R3C8 and R7C8 in column 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <45>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R2C8 - removing <4> from <124> leaving <12>
   R8C8 - removing <4> from <124> leaving <12>
Intersection of row 2 with block 3. The value <1> only appears in one or more of squares R2C7, R2C8 and R2C9 of row 2. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
   R1C7 - removing <1> from <129> leaving <29>
Intersection of row 3 with block 1. The values <39> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain these values.
   R1C1 - removing <9> from <159> leaving <15>
Intersection of row 7 with block 9. The values <45> only appears in one or more of squares R7C7, R7C8 and R7C9 of row 7. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.
   R8C7 - removing <4> from <1249> leaving <129>
Squares R1C3 and R1C7 in row 1 and R9C3 and R9C7 in row 9 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in columns 3 and 7 can be removed.
   R2C7 - removing <2> from <124> leaving <14>
   R8C3 - removing <2> from <124> leaving <14>
   R8C7 - removing <2> from <129> leaving <19>
Squares R1C3 (XY), R8C3 (XZ) and R2C2 (YZ) form an XY-Wing pattern on <4>. All squares that are buddies of both the XZ and YZ squares cannot be <4>.
   R8C2 - removing <4> from <249> leaving <29>
   R3C3 - removing <4> from <34> leaving <3>
R8C3 is the only square in row 8 that can be <4>
Intersection of row 8 with block 9. The value <1> only appears in one or more of squares R8C7, R8C8 and R8C9 of row 8. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R9C7 - removing <1> from <123> leaving <23>
The puzzle can be reduced to a Bivalue Universal Grave (BUG) pattern, by making this reduction:
   R7C7=<34>
These are called the BUG possibilities. In a BUG pattern, in each row, column and block, each unsolved possibility appears exactly twice. Such a pattern either has 0 or 2 solutions, so it cannot be part of a valid Sudoku
When a puzzle contains a BUG, and only one square in the puzzle has more than 2 possibilities, the only way to kill the BUG is to remove both of the BUG possibilities from the square, thus solving it
   R7C7 - removing <34> from <349> leaving <9>
R7C1 can only be <3>
R7C9 can only be <5>
R1C7 can only be <2>
R8C7 can only be <1>
R7C8 can only be <4>
R1C9 can only be <9>
R8C8 can only be <2>
R2C7 can only be <4>
R8C2 can only be <9>
R2C8 can only be <1>
R9C7 can only be <3>
R9C1 can only be <1>
R1C3 can only be <1>
R2C2 can only be <2>
R3C8 can only be <5>
R3C1 can only be <9>
R3C2 can only be <4>
R9C3 can only be <2>
R1C1 can only be <5>


 

This website uses cookies, for more information please view our privacy policy. By using the site you also agree to our terms and conditions. By using the site you also agree to our terms and conditions.

Line
Line