[X]

Privacy Policy + T&C

We use cookies to personalise our content and ads, and for traffic analysis. Information is also
shared with our advertising and analytics providers. By using the site you also agree to our T&C.

[X]

Common Answers

Have you entered August's Common Answers?

BB Logo
Spacer
Line
Line
Sudoku Solution Path

? ?

R1C1 can only be <9>
R5C5 can only be <4>
R3C1 can only be <6>
R9C1 can only be <3>
R5C1 can only be <1>
R7C1 can only be <7>
R2C4 is the only square in row 2 that can be <1>
R2C5 is the only square in row 2 that can be <7>
R1C7 is the only square in row 1 that can be <7>
R3C5 is the only square in row 3 that can be <5>
R3C3 is the only square in row 3 that can be <8>
R4C7 is the only square in row 4 that can be <1>
R3C9 is the only square in row 3 that can be <1>
R4C8 is the only square in row 4 that can be <4>
R2C8 can only be <9>
R5C3 is the only square in row 5 that can be <5>
R6C3 is the only square in row 6 that can be <7>
R6C8 is the only square in row 6 that can be <8>
R8C4 is the only square in row 8 that can be <7>
R8C5 is the only square in row 8 that can be <8>
R7C9 is the only square in row 7 that can be <8>
R9C3 is the only square in row 9 that can be <9>
Squares R4C2 and R4C3 in block 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <26>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R5C2 - removing <26> from <2369> leaving <39>
Intersection of row 9 with block 9. The value <4> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
   R7C7 - removing <4> from <2346> leaving <236>
Squares R2C2 and R2C6 in row 2 and R8C2 and R8C6 in row 8 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 2 and 6 can be removed.
   R3C6 - removing <4> from <349> leaving <39>
   R7C6 - removing <4> from <2349> leaving <239>
Squares R6C2, R6C7, R5C2 and R5C7 form a Type-1 Unique Rectangle on <39>.
   R5C7 - removing <39> from <2369> leaving <26>
R5C2 is the only square in row 5 that can be <9>
R6C2 can only be <3>
R6C7 can only be <9>
Squares R1C9 (XY), R1C5 (XZ) and R9C9 (YZ) form an XY-Wing pattern on <2>. All squares that are buddies of both the XZ and YZ squares cannot be <2>.
   R9C5 - removing <2> from <26> leaving <6>
Squares R9C7 and R9C9 in block 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <24>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
   R7C7 - removing <2> from <236> leaving <36>
The puzzle can be reduced to a Bivalue Universal Grave (BUG) pattern, by making this reduction:
   R7C6=<29>
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
   R7C6 - removing <29> from <239> leaving <3>
R7C5 can only be <2>
R7C7 can only be <6>
R3C6 can only be <9>
R8C6 can only be <4>
R7C3 can only be <4>
R5C7 can only be <2>
R8C8 can only be <3>
R8C2 can only be <6>
R2C6 can only be <2>
R7C4 can only be <9>
R5C8 can only be <6>
R2C2 can only be <4>
R1C5 can only be <3>
R3C4 can only be <4>
R5C9 can only be <3>
R9C7 can only be <4>
R1C9 can only be <4>
R1C3 can only be <2>
R4C2 can only be <2>
R9C9 can only be <2>
R3C7 can only be <3>
R4C3 can only be <6>


 

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