Aug 08 - Very Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R8C5 can only be <2>
R2C5 can only be <8>
R7C6 can only be <5>
R3C7 is the only square in row 3 that can be <5>
R5C5 is the only square in row 5 that can be <5>
R4C3 is the only square in row 4 that can be <5>
R5C4 is the only square in row 5 that can be <4>
R3C4 can only be <2>
R3C6 can only be <1>
R1C5 can only be <4>
R3C9 is the only square in row 3 that can be <4>
R5C6 is the only square in row 5 that can be <9>
R6C5 is the only square in row 6 that can be <1>
R6C4 is the only square in row 6 that can be <8>
R1C7 is the only square in column 7 that can be <9>
Squares R4C4 and R4C5 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R4C7 - removing <36> from <2367> leaving <27>
Squares R7C2<28>, R9C1<289> and R9C3<29> in block 7 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <289>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R7C1 - removing <28> from <1278> leaving <17>
R7C3 - removing <2> from <1247> leaving <147>
Squares R1C1<12>, R5C1<27> and R7C1<17> in column 1 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <127>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R9C1 - removing <2> from <289> leaving <89>
Squares R5C2 and R7C2 in column 2 and R5C8 and R7C8 in column 8 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in rows 5 and 7 can be removed.
R5C1 - removing <2> from <27> leaving <7>
R7C7 - removing <2> from <234678> leaving <34678>
R5C9 - removing <2> from <2367> leaving <367>
R7C9 - removing <2> from <2367> leaving <367>
R7C1 can only be <1>
R1C1 can only be <2>
R1C9 can only be <6>
R2C3 can only be <3>
R1C3 can only be <1>
R5C9 can only be <3>
R3C8 can only be <3>
R2C7 can only be <2>
R4C7 can only be <7>
R4C6 can only be <2>
R6C7 can only be <6>
R8C7 can only be <4>
R7C9 can only be <7>
R9C9 can only be <2>
R6C3 can only be <2>
R5C8 can only be <2>
R7C3 can only be <4>
R8C3 can only be <7>
R9C3 can only be <9>
R7C8 can only be <6>
R6C6 can only be <7>
R5C2 can only be <6>
R7C4 can only be <3>
R9C1 can only be <8>
R3C3 can only be <6>
R3C2 can only be <8>
R7C7 can only be <8>
R4C4 can only be <6>
R9C5 can only be <6>
R7C2 can only be <2>
R9C7 can only be <3>
R3C1 can only be <9>
R4C5 can only be <3>
Today's Sudoku Puzzles
All daily items change at midnight GMT – set your local time zone.
Note: BrainBashers has a Dark Mode setting.