HTTPS

 If you experience any problems accessing the site using HTTP, you can try HTTPS by clicking the link on the left.

[OK]

Privacy Policy  -  Terms & Conditions  -  See Details
This website uses cookies. By using this website you are accepting the use of cookies.
For more information please view our privacy policy.

BB Logo Spacer
Spacer
Line
Line
Sudoku Solution Path

?    ?

R2C2 can only be <7>
R2C8 can only be <5>
R1C7 is the only square in row 1 that can be <7>
R6C4 is the only square in row 6 that can be <3>
R7C1 is the only square in row 7 that can be <3>
R8C8 is the only square in row 8 that can be <2>
R1C3 is the only square in column 3 that can be <8>
R5C7 is the only square in column 7 that can be <2>
R5C6 is the only square in row 5 that can be <5>
R4C9 is the only square in row 4 that can be <5>
R9C7 is the only square in row 9 that can be <5>
R3C3 is the only square in column 3 that can be <2>
R1C1 can only be <1>
R3C1 can only be <6>
R1C4 is the only square in row 1 that can be <2>
R3C9 is the only square in column 9 that can be <1>
R4C5 is the only square in column 5 that can be <1>
R4C1 is the only square in row 4 that can be <2>
R6C5 is the only square in row 6 that can be <2>
R6C9 is the only square in column 9 that can be <8>
Squares R6C1 and R6C8 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
   R6C2 - removing <4> from <469> leaving <69>
   R6C6 - removing <47> from <4679> leaving <69>
Intersection of row 5 with block 5. The value <4> 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 this value.
   R4C4 - removing <4> from <489> leaving <89>
   R4C6 - removing <4> from <4789> leaving <789>
Intersection of column 3 with block 7. The value <9> only appears in one or more of squares R7C3, R8C3 and R9C3 of column 3. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
   R8C2 - removing <9> from <469> leaving <46>
Intersection of row 8 with block 8. The value <9> 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 <9> from <479> leaving <47>
   R9C4 - removing <9> from <1469> leaving <146>
   R9C6 - removing <9> from <14679> leaving <1467>
R3C5 is the only square in column 5 that can be <9>
R3C7 can only be <4>
R1C6 can only be <4>
R7C7 can only be <9>
R1C9 can only be <9>
R9C3 is the only square in row 9 that can be <9>
Squares R6C6 and R8C6 in column 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
   R4C6 - removing <9> from <789> leaving <78>
   R9C6 - removing <6> from <167> leaving <17>
Squares R6C2 and R8C2 in column 2 and R6C6 and R8C6 in column 6 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in rows 6 and 8 can be removed.
   R8C4 - removing <6> from <469> leaving <49>
The puzzle can be reduced to a Bivalue Universal Grave (BUG) pattern, by making this reduction:
   R9C4=<16>
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
   R9C4 - removing <16> from <146> leaving <4>
R9C1 can only be <7>
R9C9 can only be <6>
R5C4 can only be <6>
R8C4 can only be <9>
R7C5 can only be <7>
R7C9 can only be <4>
R5C3 can only be <7>
R6C6 can only be <9>
R6C2 can only be <6>
R8C6 can only be <6>
R4C4 can only be <8>
R7C3 can only be <6>
R5C5 can only be <4>
R9C6 can only be <1>
R8C2 can only be <4>
R6C1 can only be <4>
R2C6 can only be <8>
R2C4 can only be <1>
R4C6 can only be <7>
R4C8 can only be <4>
R4C2 can only be <9>
R6C8 can only be <7>

 

Line


BrainBashers™ is a trademark. This website uses cookies. By using this website you are accepting the use of cookies. For more information please view our privacy policy. By using this website you are also agreeing to our terms and conditions.

Line
Line